2007-12-13 17:52:37 +01:00
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NuttX TODO List (Last updated December 13, 2007)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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(6) Task/Scheduler (sched/)
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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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(10) Network (net/, netutils/)
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(2) USB (drivers/usbdev)
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(2) Libraries (lib/)
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(2) File system (fs/, drivers/)
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(2) Documentation (Documentation/)
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(3) Build system
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(0) Applications & Tests (examples/)
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(1) ARM (arch/arm/)
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(0) ARM/C5471 (arch/arm/src/c5471/)
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(1) ARM/DM320 (arch/arm/src/dm320/)
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(2) ARM/LPC214x (arch/arm/src/lpc214x/)
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(3) pjrc-8052 / MCS51 (arch/pjrc-8051/)
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2007-12-28 23:10:14 +01:00
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(0) z80 (arch/z80/)
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2007-12-13 17:52:37 +01:00
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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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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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2007-03-21 18:21:26 +01:00
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2007-06-06 12:25:20 +02:00
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o C++ Support
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2007-12-13 17:52:37 +01:00
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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: uIP/Socket callback logic is not thread safe. This means that
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a socket cannot be used concurrently by two threads. Minimal
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fix: Add mutex to support exclusion for protection.
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Status: Open
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Priority: Low. The currently socket design cannot be use concurrently
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by threads with out a major redesign. The feature is not
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of great value since the use model for multi-thread sockets
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is not common. Adding mutex support would only mask the
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underlying issue.
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Description: IPv6 support is incomplete
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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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o USB (drivers/usbdev)
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^^^^^^^^^^^^^^^^^^^^
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Description: Implement USB device support
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Status: Open
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Priority: High
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Description: Implement USB bulk / serial device support
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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: Mediam
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o File system (fs/, drivers/)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Description: Add chmod(), truncate().
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Status: Open
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Priority: Low
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Description: FAT32: long file names
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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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2007-03-21 18:21:26 +01:00
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o Build system
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2007-12-13 17:52:37 +01:00
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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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2007-12-30 22:54:55 +01:00
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(same as arch/<arch>/src/board). Seems to be worse using SDCC.
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2007-12-13 17:52:37 +01:00
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Status: Open
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2007-12-30 22:54:55 +01:00
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Priority: Medium (maybe higher for z80 target)
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2007-12-13 17:52:37 +01:00
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o Applications & Tests (examples/)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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o ARM (arch/arm/)
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^^^^^^^^^^^^^^^
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Description: Add option to use a separate stack for interrupt handling. At
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present, each interrupt executes on top of the user stack
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allocation making each user stack allocation larger than needed.
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Status: Open
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Priority: Medim
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o ARM/C5471 (arch/arm/src/c5471/)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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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: Mediam
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o ARM/LPC214x (arch/arm/src/lpc214x/)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Description: Finish bringup
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Status: Open
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Priority: High
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Description: Add MMC and USB support
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Status: Open
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Priority: Mediam
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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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2007-12-31 00:34:20 +01:00
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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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2007-12-13 17:52:37 +01:00
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Status: Open
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Priority: Medium
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2007-06-10 04:24:53 +02:00
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2007-12-31 00:34:20 +01:00
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o z80 (arch/z80)
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^^^^^^^^^^^^^^^
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Has the same problems with interger overflow during compilation as described
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for pjrc-8051
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