2134001f0f
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@600 42af7a65-404d-4744-a932-0658087f49c3
395 lines
14 KiB
Plaintext
395 lines
14 KiB
Plaintext
NuttX TODO List (Last updated January 6, 2008)
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
(6) Task/Scheduler (sched/)
|
|
(1) Dynamic loader (N/A)
|
|
(2) Memory Managment (mm/)
|
|
(1) Signals (sched/, arch/)
|
|
(1) pthreads (sched/)
|
|
(1) C++ Support
|
|
(11) Network (net/, netutils/)
|
|
(2) USB (drivers/usbdev)
|
|
(3) Libraries (lib/)
|
|
(2) File system (fs/, drivers/)
|
|
(1) Pascal add-on (pcode/)
|
|
(2) Documentation (Documentation/)
|
|
(3) Build system
|
|
(0) Applications & Tests (examples/)
|
|
(1) ARM (arch/arm/)
|
|
(1) ARM/C5471 (arch/arm/src/c5471/)
|
|
(2) ARM/DM320 (arch/arm/src/dm320/)
|
|
(2) ARM/LPC214x (arch/arm/src/lpc214x/)
|
|
(4) pjrc-8052 / MCS51 (arch/pjrc-8051/)
|
|
(2) z80 (arch/z80/)
|
|
(4) z16 (arch/z16/)
|
|
|
|
o Task/Scheduler (sched/)
|
|
^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Description: When a tasks exits, shouldn't all of its child pthreads also be
|
|
terminated?
|
|
Status: Open
|
|
Priority: Medium, required for good emulation of process/pthread model.
|
|
|
|
Description: atexit() supports registration of one function called on exit().
|
|
Should task_delete() also cause atexit() function to be called?
|
|
Status: Open
|
|
Priority: Low, task_delete() is non-standard and its behavior is
|
|
unspecified.
|
|
|
|
Description: Implement sys/mman.h and functions
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: Implement sys/wait.h and functions. Consider implementing wait,
|
|
waitpid, waitid. At present, a parent has no information about
|
|
child tasks.
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: Implement priority inheritance
|
|
Status: Open
|
|
Priority: Medium, this is a good feature for realtime systems.
|
|
|
|
Description: Several APIs do not set errno. Need to review all APIs.
|
|
Status: Open
|
|
Priority: Medium, required for standard compliance (but makes the
|
|
code bigger)
|
|
|
|
o Dynamic Loader
|
|
^^^^^^^^^^^^^^
|
|
|
|
Description: At some point in the future, I intend to port the XFLAT
|
|
dynamic loader into NuttX (see http://xflat.sourceforge.net/).
|
|
That would allow NuttX to dynamically load and link
|
|
external code in a mounted filesystem.
|
|
Status: Open
|
|
Priority: Low, Nice feature and I might do it someday
|
|
|
|
o Memory Managment (mm/)
|
|
^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Description: Add an option to free all memory allocated by a task when the
|
|
task exits. This is probably not be worth the overhead for a
|
|
deeply embedded system.
|
|
Status: Open
|
|
Priority: Medium/Low, a good feature to prevent memory leaks but would
|
|
have negative impact on memory usage and code size.
|
|
|
|
Description: Current logic adapts size_t for 16-bit address machines vs.
|
|
32-bit address machines. But a small memory option should also
|
|
be provided so that the small offset option can be used with
|
|
32-bit machines that have small RAM memories (like the lpc2148)
|
|
Status: Open
|
|
Priority: High, a good feature enhancement.
|
|
|
|
o Signals (sched/, arch/)
|
|
^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Description: 'Standard' signals and signal actions are not supported.
|
|
(e.g., SIGINT, SIGCHLD, SIGSEGV, etc).
|
|
Status: Open
|
|
Priority: Low, required by standards but not so critical for an
|
|
embedded system.
|
|
|
|
o pthreads (sched/)
|
|
^^^^^^^^^^^^^^^^^
|
|
|
|
Description: pthread_cancel(): Should implement cancellation points and
|
|
pthread_testcancel()
|
|
Status: Open
|
|
Priority: Low, probably not that useful
|
|
|
|
o C++ Support
|
|
^^^^^^^^^^^
|
|
|
|
Description: Need to call static constructors
|
|
Status: Open
|
|
Priority: Low, depends on toolchain. Call to gcc's built-in static
|
|
constructor logic will probably have to be performed by
|
|
user logic in user_start().
|
|
|
|
o Network (net/, netutils/)
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Description: Several of the netutils/ apps are untested. These include
|
|
uIP's netutils/smtp, dhcpd, resolv, webclient. Only minimal
|
|
testing of the others has been performed.
|
|
Status: Open
|
|
Priority: Medium, Important but not core NuttX functionality
|
|
|
|
Description: Should implement SOCK_RAW, SOCK_PACKET
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: uIP polling issues / Multiple network interface support:
|
|
(1) Current logic will not support multiple ethernet drivers.
|
|
Each driver should poll on TCP connections connect on the
|
|
network supported by the driver; UDP polling should respond
|
|
with TX data only if the UDP packet is intended for the
|
|
the network supported by the driver.
|
|
(2) If there were multiple drivers, polling would occur at
|
|
double the rate. Fix by using bound IP address in TCP
|
|
connection (lipaddr) and verifying that it is in the subnet
|
|
served by the driver.
|
|
Status: Open
|
|
Priority: Medium, The feature is not important, but it is important
|
|
for NuttX to resolve the architectural issues.
|
|
|
|
Description: Sendoto() and multiple network interface support:
|
|
When polled, would have to assure that the destination IP
|
|
is on the subnet served by the polling driver.
|
|
Status: Open
|
|
Priority: Medium, The feature is not important, but it is important
|
|
for NuttX to resolve the architectural issues.
|
|
|
|
Description: uIP/Socket callback logic is not thread safe. This means that
|
|
a socket cannot be used concurrently by two threads. Minimal
|
|
fix: Add mutex to support exclusion for protection.
|
|
Status: Open
|
|
Priority: Low. The currently socket design cannot be use concurrently
|
|
by threads with out a major redesign. The feature is not
|
|
of great value since the use model for multi-thread sockets
|
|
is not common. Adding mutex support would only mask the
|
|
underlying issue.
|
|
|
|
Description: IPv6 support is incomplete
|
|
Status: Open
|
|
Priority: Medium
|
|
|
|
Description: Incoming UDP broadcast should only be accepted if listening on
|
|
INADDR_ANY(?)
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: Read-ahead buffers capture incoming TCP data when no user
|
|
thread is recv-ing the data. Should add some driver call to
|
|
support throttling; when there is no listener for new data, the
|
|
driver should be throttled. Perhaps the driver should disable
|
|
RX interrupts when throttled and re-anable on each poll time.
|
|
recvfrom would, of course, have to un-throttle.
|
|
Status: Open
|
|
Priority: Medium
|
|
|
|
Description: Need to standardize collection of statistics from network
|
|
drivers. examples/nsh ifconfig command should present
|
|
statistics.
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: Outgoing packets are dropped and overwritten by ARP packets
|
|
if the destination IP has not been mapped to a MAC. Could
|
|
improve send() performance by explicitly performing ARP before
|
|
sending the packet.
|
|
Status: Open
|
|
Priority: Medium
|
|
|
|
Description: Port PPP support from http://contiki.cvs.sourceforge.net/contiki/contiki-2.x/backyard/core/net/ppp/
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
o USB (drivers/usbdev)
|
|
^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Description: Implement USB device support
|
|
Status: Open
|
|
Priority: High
|
|
|
|
Description: Implement USB bulk / serial device support
|
|
Status: Open
|
|
Priority: High
|
|
|
|
o Libraries (lib/)
|
|
^^^^^^^^^^^^^^^^
|
|
|
|
Description: sscanf() and lib_vsprintf() do not support floating point
|
|
values.
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: The definition of environ in stdlib.h is bogus and will not
|
|
work as it should. This is because the underlying
|
|
representation of the environment is not an arry of pointers.
|
|
Status: Open
|
|
Priority: Medium
|
|
|
|
Description: There are two different copies of getenv(): One in
|
|
sched/env_getenv.c and one in lib/lib_getenv(). Keep one.
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
o File system (fs/, drivers/)
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Description: Add chmod(), truncate().
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: FAT32: long file names
|
|
Status: Open
|
|
Priority: Medium
|
|
|
|
o Pascal Add-On (pcode/)
|
|
^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Description: Need a test to verify execution of P-Code from files.
|
|
Need APIs to verify execution of P-Code from memory buffer.
|
|
Status: Open
|
|
Priority: Medium
|
|
|
|
o Documentation (Documentation/)
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Description: Document driver/ logic
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: Document C-library APIs
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
o Build system
|
|
^^^^^^^^^^^^
|
|
|
|
Description: Some names under arch are still incorrect. These should be
|
|
processor architecture names: pjrc-8051 should be 805x
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: configs/pjrc-8051 should be configs/pjrc-87c52
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: Dependencies do not work correctly under configs/<board>/src
|
|
(same as arch/<arch>/src/board). Seems to be worse using SDCC.
|
|
Status: Open
|
|
Priority: Medium (maybe higher for z80 target)
|
|
|
|
o Applications & Tests (examples/)
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
o ARM (arch/arm/)
|
|
^^^^^^^^^^^^^^^
|
|
|
|
Description: Add option to use a separate stack for interrupt handling. At
|
|
present, each interrupt executes on top of the user stack
|
|
allocation making each user stack allocation larger than needed.
|
|
Status: Open
|
|
Priority: Medium
|
|
|
|
o ARM/C5471 (arch/arm/src/c5471/)
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Description: UART re-configuration is untested and conditionally compiled out.
|
|
Status: Open
|
|
Priority: Medium. ttyS1 is not configured, but not used; ttyS0 is configured
|
|
by the bootloader
|
|
|
|
o ARM/DM320 (arch/arm/src/dm320/)
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Description: config/ntos-dm320: It seems that when a lot of debug statements
|
|
are added, the system no longer boots. This is suspected to be
|
|
a stack problem: Making the stack bigger or removing arrays on
|
|
the stack seems to fix the problem (might also be the
|
|
bootloader overwriting memory)
|
|
Status: Open
|
|
Priority: Medium
|
|
|
|
Description: UART re-configuration is untested and conditionally compiled out.
|
|
Status: Open
|
|
Priority: Medium. ttyS1 is not configured, but not used; ttyS0 is configured
|
|
by the bootloader
|
|
|
|
o ARM/LPC214x (arch/arm/src/lpc214x/)
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Description: Finish bringup
|
|
Status: Open
|
|
Priority: High
|
|
|
|
Description: Add MMC and USB support
|
|
Status: Open
|
|
Priority: Mediam
|
|
|
|
o pjrc-8052 / MCS51 (arch/pjrc-8051/)
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Description: Current status:
|
|
- Basic OS task management seems OK
|
|
- Fails when interrupts enabled. The stack pointer is around
|
|
0x6e before the failure occurs. It looks like some issue
|
|
when the stack pointer moves from the directly to indirectly
|
|
addressable region (0x80 boundary).
|
|
- Work on the 8052 is temporarily on hold
|
|
Status: Open
|
|
Priority: Low, 8051 is a tough platform because of the tiny stack.
|
|
|
|
Description: Use timer 0 as system timer. Timer 2 is needed for second UART.
|
|
Logic is implemented, but there needs to be a system
|
|
configuration to change the ticks-per-second value to match the
|
|
timer interrupt rate
|
|
Status: Open
|
|
Priority: Low
|
|
|
|
Description: During build, there are several integer overflows reported:
|
|
sched/gmtime_r.c aroud lines 184 and 185
|
|
sched/clock_initialize.c at line 107
|
|
sched/pthread_create.c at 330
|
|
examples/ostest/barrier.c around lines 53 and 74
|
|
examples/ostest/sighand.c at 225 and 244
|
|
driver/serial.c in usleep calls around 347 and 354
|
|
Status: Open
|
|
Priority: Medium
|
|
|
|
Description Global data is not being initialized. Logic like that of SDCCs
|
|
crt0*.s needs to be incorporated into the system boot logic
|
|
Status: Open
|
|
Priority: Low -- only because there as so many other issues with 8051
|
|
|
|
o z80 (arch/z80)
|
|
^^^^^^^^^^^^^^^
|
|
|
|
Description: The Has the same problems with interger overflow during compilation
|
|
as described for pjrc-8051. At typical cause is code like
|
|
usleep(500*1000) which exceeds the range of a 16-bit integer
|
|
Status: See pjrc-8051
|
|
Priority: See pjrc-8051
|
|
|
|
Description: The simulated serial console (configs/z80sim/src/z80_serial.c +
|
|
driver/serial.c) does not work. This is because there are
|
|
no interrupts in the simulation so there is never any serial
|
|
traffic.
|
|
Status: Open
|
|
Priority: Low -- the simulated console is not critical path and the designs
|
|
to solve the problem are complex.
|
|
|
|
|
|
o z16 (arch/z16)
|
|
^^^^^^^^^^^^^^^^
|
|
|
|
Description: ZDS-II Librarian complains that the source for the .obj file
|
|
is not in the library.
|
|
Status: Open
|
|
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. I have not determined the cause for this -- it
|
|
may be an issue with optimization?? Or clock setup??
|
|
Status: Open
|
|
Priority: Medium-High |