3789784a97
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1200 42af7a65-404d-4744-a932-0658087f49c3
615 lines
24 KiB
Plaintext
615 lines
24 KiB
Plaintext
NuttX TODO List (Last updated July 31, 2008)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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(7) Task/Scheduler (sched/)
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(1) Dynamic loader (N/A)
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(2) Memory Managment (mm/)
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(1) Signals (sched/, arch/)
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(1) pthreads (sched/)
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(1) C++ Support
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(12) Network (net/, netutils/)
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(1) USB (drivers/usbdev)
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(3) Libraries (lib/)
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(5) File system/Generic drivers (fs/, drivers/)
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(1) Pascal add-on (pcode/)
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(2) Documentation (Documentation/)
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(3) Build system
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(2) NuttShell (NSH) (examples/nsh)
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(1) Other Applications & Tests (examples/)
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(1) ARM (arch/arm/)
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(1) ARM/C5471 (arch/arm/src/c5471/)
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(1) ARM/DM320 (arch/arm/src/dm320/)
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(6) ARM/LPC214x (arch/arm/src/lpc214x/)
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(3) ARM/STR71x (arch/arm/src/str71x/)
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(4) pjrc-8052 / MCS51 (arch/pjrc-8051/)
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(7) z80/z8 (arch/z80/)
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(8) z16 (arch/z16/)
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o Task/Scheduler (sched/)
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^^^^^^^^^^^^^^^^^^^^^^^
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Description: When a tasks exits, shouldn't all of its child pthreads also be
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terminated?
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Status: Open
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Priority: Medium, required for good emulation of process/pthread model.
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Description: atexit() supports registration of one function called on exit().
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Should task_delete() also cause atexit() function to be called?
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Status: Open
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Priority: Low, task_delete() is non-standard and its behavior is
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unspecified.
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Description: Implement sys/mman.h and functions
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Status: Open
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Priority: Low
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Description: Implement sys/wait.h and functions. Consider implementing wait,
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waitpid, waitid. At present, a parent has no information about
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child tasks.
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Status: Open
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Priority: Low
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Description: Implement priority inheritance
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Status: Open
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Priority: Medium, this is a good feature for realtime systems.
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Description: Several APIs do not set errno. Need to review all APIs.
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Status: Open
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Priority: Medium, required for standard compliance (but makes the
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code bigger)
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Description: socket descriptors are not cloned as are file descriptors
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by task_create().
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Status: Open
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Priority: Medium-to-High
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o Dynamic Loader
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^^^^^^^^^^^^^^
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Description: At some point in the future, I intend to port the XFLAT
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dynamic loader into NuttX (see http://xflat.sourceforge.net/).
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That would allow NuttX to dynamically load and link
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external code in a mounted filesystem.
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Status: Open
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Priority: Low, Nice feature and I might do it someday
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o Memory Managment (mm/)
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^^^^^^^^^^^^^^^^^^^^^^
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Description: Add an option to free all memory allocated by a task when the
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task exits. This is probably not be worth the overhead for a
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deeply embedded system.
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Status: Open
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Priority: Medium/Low, a good feature to prevent memory leaks but would
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have negative impact on memory usage and code size.
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Description: Current logic adapts size_t for 16-bit address machines vs.
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32-bit address machines. But a small memory option should also
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be provided so that the small offset option can be used with
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32-bit machines that have small RAM memories (like the lpc2148)
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Status: Open
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Priority: High, a good feature enhancement.
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o Signals (sched/, arch/)
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^^^^^^^^^^^^^^^^^^^^^^^
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Description: 'Standard' signals and signal actions are not supported.
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(e.g., SIGINT, SIGCHLD, SIGSEGV, etc).
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Status: Open
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Priority: Low, required by standards but not so critical for an
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embedded system.
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o pthreads (sched/)
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^^^^^^^^^^^^^^^^^
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Description: pthread_cancel(): Should implement cancellation points and
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pthread_testcancel()
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Status: Open
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Priority: Low, probably not that useful
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o C++ Support
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^^^^^^^^^^^
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Description: Need to call static constructors
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Status: Open
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Priority: Low, depends on toolchain. Call to gcc's built-in static
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constructor logic will probably have to be performed by
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user logic in user_start().
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o Network (net/, netutils/)
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^^^^^^^^^^^^^^^^^^^^^^^^^
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Description: Several of the netutils/ apps are untested. These include
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uIP's netutils/smtp, dhcpd, resolv, webclient. Only minimal
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testing of the others has been performed.
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Status: Open
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Priority: Medium, Important but not core NuttX functionality
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Description: Should implement SOCK_RAW, SOCK_PACKET
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Status: Open
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Priority: Low
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Description: uIP polling issues / Multiple network interface support:
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(1) Current logic will not support multiple ethernet drivers.
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Each driver should poll on TCP connections connect on the
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network supported by the driver; UDP polling should respond
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with TX data only if the UDP packet is intended for the
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the network supported by the driver.
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(2) If there were multiple drivers, polling would occur at
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double the rate. Fix by using bound IP address in TCP
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connection (lipaddr) and verifying that it is in the subnet
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served by the driver.
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Status: Open
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Priority: Medium, The feature is not important, but it is important
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for NuttX to resolve the architectural issues.
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Description: Sendoto() and multiple network interface support:
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When polled, would have to assure that the destination IP
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is on the subnet served by the polling driver.
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Status: Open
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Priority: Medium, The feature is not important, but it is important
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for NuttX to resolve the architectural issues.
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Description: IPv6 support is incomplete. Adam Dunkels has recently announced
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IPv6 support for uIP (currently only as part of Contiki). Those
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changes need to be ported to NuttX.
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Status: Open
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Priority: Medium
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Description: Incoming UDP broadcast should only be accepted if listening on
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INADDR_ANY(?)
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Status: Open
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Priority: Low
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Description: Read-ahead buffers capture incoming TCP data when no user
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thread is recv-ing the data. Should add some driver call to
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support throttling; when there is no listener for new data, the
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driver should be throttled. Perhaps the driver should disable
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RX interrupts when throttled and re-anable on each poll time.
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recvfrom would, of course, have to un-throttle.
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Status: Open
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Priority: Medium
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Description: Need to standardize collection of statistics from network
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drivers. examples/nsh ifconfig command should present
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statistics.
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Status: Open
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Priority: Low
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Description: Outgoing packets are dropped and overwritten by ARP packets
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if the destination IP has not been mapped to a MAC. Could
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improve send() performance by explicitly performing ARP before
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sending the packet.
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Status: Open
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Priority: Medium
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Description: Port PPP support from http://contiki.cvs.sourceforge.net/contiki/contiki-2.x/backyard/core/net/ppp/
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Status: Open
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Priority: Low
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Description: At present, there cannot be two concurrent active TCP send
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operations in progress. This is because the uIP ACK logic will
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support only one transfer at a time. The solution is simple:
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A mutex will be needed to make sure that each send that is
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started is able to be the exclusive sender until all of the
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data to be sent has been ACKed.
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Status: Open. There is some temporary logic to examples/nsh that does
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this same fix and that temporary logic should be removed when
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send() is fixed.
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Priority: Medium-Low. This is an important issue for applications that
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send on the same TCP socket from multiple threads.
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Description: Some application-level interface to the ICMP logic is needed
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to support ping from the target.
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Status: Open
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Priority: Low
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o USB (drivers/usbdev)
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^^^^^^^^^^^^^^^^^^^^
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Description: The USB bulk storage class driver configuration (examples/usbstorage)
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does not work reliably when debug is disabled (CONFIG_DEBUG+CONFIG_DEBUG_VERBOSE
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+CONFIG_DEBUG_USB) on WinXP (Linux appears to be fine). A race condition would
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would be a possibility. The symptom is that that WinXP sends a MODE SENSE (6)
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command with an unsupported mode page (0x1c/0x00)
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Status: Open
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Priority: High
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o Libraries (lib/)
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^^^^^^^^^^^^^^^^
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Description: sscanf() and lib_vsprintf() do not support floating point
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values.
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Status: Open
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Priority: Low
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Description: The definition of environ in stdlib.h is bogus and will not
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work as it should. This is because the underlying
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representation of the environment is not an arry of pointers.
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Status: Open
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Priority: Medium
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o File system / Generic drivers (fs/, drivers/)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Description: Implement chmod(), truncate().
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Status: Open
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Priority: Low
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Description: FAT: long file names
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Status: Open
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Priority: Medium
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Description: The CAN driver is untested. Add a test for the CAN driver.
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Status: Open
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Priority: Medium
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Description: There is no way to remove a FIFO or PIPE created in the
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psuedo filesystem. Once created, they persist indefinitely
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and cannot be unlinked. This is actually a more generic
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issue: unlink does not work for anything in the psuedo-
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filesystem.
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Status: Open, but partially resolved: pipe buffer is at least freed
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when there are not open references to the pipe/FIFO.
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Priority: Medium
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Description: The ROMFS file system does not verify checksums on either
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volume header on on the individual files.
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Status: Open
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Priority: Low. I have mixed feelings about if NuttX should pay a
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performance penalty for better data integrity.
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Description: FAT: FAT32 is untested -- because I don't have any large
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enough devices yet to support a FAT32 FS.
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Status: Open
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Priority: Medium
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Description: The simple SPI based MMCS/SD driver in fs/mmcsd does not
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yet handle multiple block transfers.
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Status: Open
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Priority: Medium-Low
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o Pascal Add-On (pcode/)
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^^^^^^^^^^^^^^^^^^^^^^
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Description: Need APIs to verify execution of P-Code from memory buffer.
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Status: Open
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Priority: Low
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Description: Loader and object format may be too large for some small
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memory systems. Consider ways to reduce memory footprint.
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Status: Open
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Priority: Medium
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o Documentation (Documentation/)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Description: Document driver/ logic
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Status: Open
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Priority: Low
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Description: Document C-library APIs
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Status: Open
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Priority: Low
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o Build system
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^^^^^^^^^^^^
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Description: Some names under arch are still incorrect. These should be
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processor architecture names: pjrc-8051 should be 805x
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Status: Open
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Priority: Low
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Description: configs/pjrc-8051 should be configs/pjrc-87c52
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Status: Open
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Priority: Low
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Description: Dependencies do not work correctly under configs/<board>/src
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(same as arch/<arch>/src/board). Seems to be worse using SDCC.
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Status: Open
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Priority: Medium (maybe higher for z80 target)
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Description: It would be nice to de-couple some of the behaviors enabled by
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CONFIG_DEBUG. For example, CONFIG_DEBUG turns on debug output,
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but also disables optimization make the binary much bigger.
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Status: Low. There workaround is easy.. just edit the configuration's
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Make.def file to control the behavior that you want.
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Priority: Very low.
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o NuttShell (NSH) (examples/nsh)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Description: When the telnetd front end is received, each TCP packet
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received causes a prompt (nsh >) to be presented. The
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prompt should only be presented when the user enters a
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carriage return.
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Status: Open
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Priority: Low
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Description: Here are some commands that would be good to have in NSH:
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ping
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Status: Open
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Priority: Low
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o Other Applications & Tests (examples/)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Description: The redirection test (part of examples/pipe) terminates
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incorrectly on the Cywgin-based simulation platform (but works
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fine on the Linux-based simulation platform).
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o ARM (arch/arm/)
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^^^^^^^^^^^^^^^
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Description: ARM interrupt handling performance could be improved in many
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ways. One easy way is to use a pointer to the context save
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area in current_regs instead of using up_copystate so much.
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see handling of 'current_regs" in arch/sh/src/common/* for
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examples of how this might be done.
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Status: Open
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Priority: Low
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o ARM/C5471 (arch/arm/src/c5471/)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Description: UART re-configuration is untested and conditionally compiled out.
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Status: Open
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Priority: Medium. ttyS1 is not configured, but not used; ttyS0 is configured
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by the bootloader
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o ARM/DM320 (arch/arm/src/dm320/)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Description: config/ntos-dm320: It seems that when a lot of debug statements
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are added, the system no longer boots. This is suspected to be
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a stack problem: Making the stack bigger or removing arrays on
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the stack seems to fix the problem (might also be the
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bootloader overwriting memory)
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Status: Open
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Priority: Medium
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Description: A USB device controller driver was added but has never been tested.
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Status: Open
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Priority: Medium
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o ARM/LPC214x (arch/arm/src/lpc214x/)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Description: Should use Vector Interrupts
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Status: Open
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Priority: Low
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Description: USB DMA not fully implemented. Partial logic is in place but it is
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fragmentary and bogus.
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Status: Open
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Priority: Low
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Description: USB Serial Driver reports wrong error when opened before the
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USB is connected (reports EBADF instead of ENOTCONN)
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Status: Open
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Priority: Low
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Description: The USB bulk storage class driver configuration (examples/usbstorage)
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does not work reliably when debug is disabled (CONFIG_DEBUG+CONFIG_DEBUG_VERBOSE
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+CONFIG_DEBUG_USB) on WinXP (Linux appears to be fine). A race condition would
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would be a possibility. The symptom is that that WinXP sends a MODE SENSE (6)
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command with an unsupported mode page (0x1c/0x00)
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Status: Open
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Priority: High
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Description: At present the SPI driver is polled. Should it be interrupt driven?
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Status: Open
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Priority: Medium
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Description: At present the SPI driver is polled -AND- there is a rather large, arbitrary,
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delay in one of the block access routines. The purpose of the delay is to
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avoid a race conditions. This begs for a re-design -OR- at a minimum, some
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optimiation of the delay time.
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Status: Open
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Priority: Medium
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o ARM/STR71x (arch/arm/src/str71x/)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Description: Basic port is complete but untested. Complete integration
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Status: Open
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Priority: High
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Description: Add SPI driver and integrate with MMC/SD support.
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Status: Open
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Priority: Medium
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Description: Develop a USB driver and integrate with existing USB serial
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and storage class drivers.
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Status: Open
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Priority: Medium
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o pjrc-8052 / MCS51 (arch/pjrc-8051/)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Description: Current status:
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- Basic OS task management seems OK
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- Fails when interrupts enabled. The stack pointer is around
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0x6e before the failure occurs. It looks like some issue
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when the stack pointer moves from the directly to indirectly
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addressable region (0x80 boundary).
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- Work on the 8052 is temporarily on hold
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Status: Open
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Priority: Low, 8051 is a tough platform because of the tiny stack.
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Description: Use timer 0 as system timer. Timer 2 is needed for second UART.
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Logic is implemented, but there needs to be a system
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configuration to change the ticks-per-second value to match the
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timer interrupt rate
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Status: Open
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Priority: Low
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Description: During build, there are several integer overflows reported:
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sched/gmtime_r.c aroud lines 184 and 185
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sched/clock_initialize.c at line 107
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sched/pthread_create.c at 330
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examples/ostest/barrier.c around lines 53 and 74
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examples/ostest/sighand.c at 225 and 244
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driver/serial.c in usleep calls around 347 and 354
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Status: Open
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Priority: Medium
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Description Global data is not being initialized. Logic like that of SDCCs
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crt0*.s needs to be incorporated into the system boot logic
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Status: Open
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Priority: Low -- only because there as so many other issues with 8051
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o z80/z8 (arch/z80)
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^^^^^^^^^^^^^^^^^^
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Description: The SDCC version the same problems with interger overflow during
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compilation as described for pjrc-8051. At typical cause is code like
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usleep(500*1000) which exceeds the range of a 16-bit integer
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Status: See pjrc-8051
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Priority: See pjrc-8051
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Description: The simulated Z80 serial console (configs/z80sim/src/z80_serial.c +
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driver/serial.c) does not work. This is because there are
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no interrupts in the simulation so there is never any serial
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traffic.
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Status: Open
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Priority: Low -- the simulated console is not critical path and the designs
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to solve the problem are complex.
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Description: ZDS-II Librarian complains that the source for the .obj file
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is not in the library.
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Status: Open
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Priority: Low, thought to be cosmetic. I think this is a consequence of
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replacing vs. inserting the library.
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Description: The ZDS-II compiler (version 4.10.1) fails with an internal error
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while compiler mm/mm_initialize. This has been reported as
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incident 81509.
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I have found the following workaround that I use to build for the
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time being:
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--- mm/mm_initialize.c.SAVE 2008-02-13 08:06:46.833857700 -0600
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+++ mm/mm_initialize.c 2008-02-13 08:07:26.367608900 -0600
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@@ -94,8 +94,11 @@
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{
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int i;
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+#if 0 /* DO NOT CHECK IN */
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CHECK_ALLOCNODE_SIZE;
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CHECK_FREENODE_SIZE;
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+#endif
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/* Set up global variables */
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Status: Open
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Priority: High
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Description: Add support for prioritized ez8 interrupts. Currently logic supports
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only nominal interrupt priority.
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Status: Open
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Priority: Low
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Description: The z8Encore! port has only been verified on the ZDS-II instruction
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set simulator.
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Status: Open
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Priority: Medium
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Description: Upgrade to the ZDS-II Z8Encore! 4.11.0 toolchain
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Status: Open
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Priority: Low
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o z16 (arch/z16)
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^^^^^^^^^^^^^^^^
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Description: ZDS-II Librarian complains that the source for the .obj file
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is not in the library.
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Status: Open
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Priority: Low, thought to be cosmetic. I think this is a consequence of
|
|
replacing vs. inserting the library.
|
|
|
|
Description: When the interrupt-driven serial driver is used, the system
|
|
hangs. This is because of TX ready (TRDE) interrupts that
|
|
get lost while interrupts are disabled. The existing
|
|
serial driver appears to be limited to hardware with a
|
|
latching, level-sensitive TX ready interrupt.
|
|
Status: Open
|
|
Priority: Medium. A polled, write-only serial driver is used in the
|
|
interim for system testing.
|
|
|
|
Description: The system delays do not appear to be correct with the
|
|
examples/ostest/timedmqueue.c test.
|
|
Status: Open
|
|
Priority: Medium-High
|
|
|
|
Description: At present, the z16f port does not run properly when CONFIG_DEBUG
|
|
is disabled: The obvious symptom is that there is no printf()
|
|
output. I have isolated with problem to errors in optimization.
|
|
With -reduceopt on the command line, I can get the printf output.
|
|
However, there are still errors in the compiled code -- specifically
|
|
in sched/timer_create.c.
|
|
|
|
I have submitted a bug report to ZiLOG for this (support incident
|
|
81400). You can see the status of the bug report (and lots more
|
|
technical detail) here:
|
|
http://support.zilog.com/support/incident/incident_support.asp?iIncidentId=81400&iSiteId=1&chLanguageCode=ENG
|
|
|
|
Summary of ZiLOG analysis: "This is a ZNEO compiler problem. ... [a] workaround
|
|
is to replace:
|
|
if ( !timerid || (clockid != 0) )
|
|
By:
|
|
if ((clockid != 0) || !timerid)"
|
|
|
|
Status: Open
|
|
Priority: Medium-High
|
|
|
|
Description: The pascal add-on does not work with the z16f (that is
|
|
configuration z16f2800100zcog/pashello). This appears to be
|
|
another ZDS-II error: when executing the instruction
|
|
SYSIO 0, WRITESTR a large case statement is executed. This
|
|
involves a call into the ZiLOG runtime library to __uwcase().
|
|
__uwcase is passed a pointer to a structure containing jump
|
|
information. The cause of the failure appears to be that
|
|
the referenced switch data is bad.
|
|
This is submited as ZiLOG support incident 81459.
|
|
|
|
Summary of ZiLOG analysis: "This is a ZNEO run time library problem.
|
|
One workaround is to replace the line 58 in uwcase.asm
|
|
|
|
From:
|
|
ADD R9,#4 ; Skip handler
|
|
To:
|
|
ADD R9,#2 ; Skip handler
|
|
|
|
And add uwcase.asm to the project.
|
|
|
|
If the customer does not want to modify uwcase.asm then the other
|
|
workaround is to add a dummy case and make it same as default:
|
|
|
|
case 0x8000:
|
|
default:
|
|
|
|
This will make sure that uwcase is not called but ulcase is called."
|
|
Status: Open. Due to licensing issues, I cannot include the modified
|
|
uwcase in the NuttX code base.
|
|
Priority: Medium
|
|
|
|
Description: Add support to maintain SPOV in context switching. This
|
|
improvement will provide protection against stack overflow
|
|
and make a safer system solution.
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: Add support for prioritized interrupts. Currently logic supports
|
|
only nominal interrupt priority.
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: Upgrade to the ZDS-II ZNEO 4.11.1 toolchain
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
|
|
|