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  • NuttX TODO List (Last updated February 13, 2008)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    
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      (6)  Task/Scheduler (sched/)
    
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      (1)  Dynamic loader (N/A)
    
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      (2)  Memory Managment (mm/)
      (1)  Signals (sched/, arch/)
      (1)  pthreads (sched/)
      (1)  C++ Support
    
      (11) Network (net/, netutils/)
    
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      (2)  USB (drivers/usbdev)
    
      (3)  Libraries (lib/)
    
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      (3)  File system/Generic drivers (fs/, drivers/)
    
      (1)  Pascal add-on (pcode/)
    
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      (2)  Documentation (Documentation/)
      (3)  Build system
      (0)  Applications & Tests (examples/)
      (1)  ARM (arch/arm/)
    
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      (1)  ARM/C5471 (arch/arm/src/c5471/)
    
      (1)  ARM/DM320 (arch/arm/src/dm320/)
    
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      (2)  ARM/LPC214x (arch/arm/src/lpc214x/)
    
      (4)  pjrc-8052 / MCS51 (arch/pjrc-8051/)
    
      (6)  z80/z8 (arch/z80/)
    
      (7)  z16 (arch/z16/)
    
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    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)
    
    
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    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
    
    
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    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
    
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    o C++ Support
    
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      ^^^^^^^^^^^
    
      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
    
    
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      Description: Port PPP support from http://contiki.cvs.sourceforge.net/contiki/contiki-2.x/backyard/core/net/ppp/
      Status:      Open
      Priority:    Low
    
    
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    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
    
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      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
    
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    o File system / Generic drivers (fs/, drivers/)
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    
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      Description: Add chmod(), truncate().
      Status:      Open
      Priority:    Low
    
      Description: FAT32: long file names
      Status:      Open
      Priority:    Medium
    
    
      Description: The CAN driver is untested.  Add a test for the CAN driver.
    
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      Status:      Open
      Priority:    Medium
    
    
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    o Pascal Add-On (pcode/)
      ^^^^^^^^^^^^^^^^^^^^^^
    
    
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      Description: Need APIs to verify execution of P-Code from memory buffer.
      Status:      Open
    
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      Priority:    Low
    
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      Description: Loader and object format may be too large for some small
                   memory systems.  Consider ways to reduce memory footprint.
    
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      Status:      Open
      Priority:    Medium
    
    
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    o Documentation (Documentation/)
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    
      Description: Document driver/ logic
      Status:      Open
      Priority:    Low
    
      Description: Document C-library APIs
      Status:      Open
      Priority:    Low
    
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    o Build system
    
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      ^^^^^^^^^^^^
    
      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.
    
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      Status:      Open
    
      Priority:    Medium (maybe higher for z80 target)
    
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    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
    
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      Priority:    Medium
    
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    o ARM/C5471 (arch/arm/src/c5471/)
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    
    
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      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
    
    
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    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
    
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      Priority:    Medium
    
    
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    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:
    
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                   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
    
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                   driver/serial.c in usleep calls around 347 and 354
    
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      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
    
    
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    o z80/z8 (arch/z80)
     ^^^^^^^^^^^^^^^^^^
    
      Description: The SDCC version 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 Z80 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.
    
    
      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.
    
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      Description: The ZDS-II compiler (version 4.10.1) fails with an internal error
                   while compiler mm/mm_initialize.  This has been reported as
                   incident 81509.
    
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                   I have found the following workaround that I use to build for the
                   time being:
    
                   --- mm/mm_initialize.c.SAVE	2008-02-13 08:06:46.833857700 -0600
                   +++ mm/mm_initialize.c	2008-02-13 08:07:26.367608900 -0600
                   @@ -94,8 +94,11 @@
                   {
                      int i;
    
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                   +#if 0 /* DO NOT CHECK IN */
                      CHECK_ALLOCNODE_SIZE;
                      CHECK_FREENODE_SIZE;
                   +#endif
    
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                   /* Set up global variables */
    
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      Status:      Open
      Priority:    High
    
      Description: Add support for prioritized ez8 interrupts.  Currently logic supports
                   only nominal interrupt priority.
      Status:      Open
      Priority:    Low
    
    
      Description: The z8Encore! port has only been verified on the ZDS-II instruction
                   set simulator.
      Status:      Open
      Priority:    Medium
    
    
    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.
    
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      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.
    
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      Description: The system delays do not appear to be correct with the
                   examples/ostest/timedmqueue.c test.
    
      Status:      Open
    
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      Priority:    Medium-High
    
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      Description: At present, the z16f port does not run properly when CONFIG_DEBUG
    
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                   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.
    
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                   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
    
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                   Summary of ZiLOG analysis: "This is a ZNEO compiler problem. ... [a] workaround
                   is to replace:
                       if ( !timerid || (clockid != 0) )
                    By:
                       if ((clockid != 0) || !timerid)"
    
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      Status:      Open
    
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      Priority:    Medium-High
    
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      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.
    
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                   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."
    
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      Status:      Open.  Due to licensing issues, I cannot include the modified
                   uwcase in the NuttX code base.
    
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      Priority:    Medium
    
    
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      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