ToDo

GCC / Buildroot Tool Chain

  • support for Execute in Place ("XIP") for nommu flavor (needs completely position independent code ("PIC") support by the Compiler)
  • support for "thread" keyword
  • support for MMU-based architecture

Kernel Arch 

  • Every pieces of nios2 code should be reviewed and compared again those of m68knommu or other arch.
    Files to be revised:
    • file1...
    • file2...
  • Coding style clean up.
  • Optional MPU support.
  • Optional "full" Linux with MMU
  • Would providing architecture specific "atomic" code instead of using the code in "asm-general" be beneficial ? 
  • Is there a way to support hardware for some atomic instructions for Kernel mutex/spinlioc and FUTEX ? (see multi-threading)

Kernel Drivers 

  • All drivers should use platform driver model.
    Drivers to be revised:
    • driver1...
    • driver2...
  • Opencore I2C driver,   there is the driver in mainline kernel, but we need platform data and testing.
    === done, also all drivers are in new driver form mainline ===
  • SPI driver, the old one is useless. The new one should be developed.
    === is the driver that supports SPI for the NEEK touchscreen and SD-Card good enough for general applications ? ===
  • DMA interface driver, the old one is useless.
  • NEEK LCD framebuffer
    === done ===
  • NEEK touch screen driver
    === done ===
  • "programmable timer" driver for "tickless Linux" (the appropriate hardware needs to be designed, too)
  • ioremap as a macro to inline it if nommu

File Systems

  • cifs (Samba) client (hangs)

Make / Configuration System

  • Add NEEK to board selection
    === done ===
  • When XIP is available move as many apps as possible into busybox by default (init, shell, ...)
  • When XIP is available use hush as a better shell than sash by default
  • Makefile glitch: 10 times "Making symlinks in include/". Once seems to be enough.
    === done ===
  • Better integration of the definition of the ptf file to be used (no "make vendor_hwselect" necessary after "make clean")

User Space Libs and Apps

  • Compiling error when gdb-server is activate
    === partly solved:
    gdbserver is not enabled as default any more
    gdbserver (old) - which does not support multithreadding - can be used ===

  • More "user friendly" FTP server by enabling ls in busybox on default and adding password for root (and a user uclinux) in passwd
  • Start inetd and boa in rc on default (no harm done, if they can't run due to not Ethernet configured)
  • "haserl" does not compile (Makefile problem) 
    === partly solved ===  (On some systems a dummy file "NEWS" seems to be necessary.)
  • "haserl" does not work
    === partly solved ===  (After adding a line syslog("Haserl start") in main() it works due to a miracle. It only works if the syslog daemon is running)
    === solved ===  (with boa 0.94.14 the problem magically disappeared)
  • "haserl" very slow
    === solved ===  (by using hush instead of msh. An even better solution would need XIP for the busybox tools other than echo and test / "[" )
  • Support for dynamic linking
    Beside potential space and speed benefits this would solve some queer licensing issues regarding glibc.

multi-threading Support

  • NPTL
  • provide a decent architecture-aware "atomic" code for  FUTEX (disble interrupt -> do stuff ->  enable interrupt) instead of using the code in "asm-general". This is a decent way to go if no MPU is used, as di/ei can be done in user land. If with "full" Linux the MPU is activated (and thus di/ei is privilidged and only executable in Kernel space) we would need to have hardware support for some atomic instructions.
  • at best have Altera add some atomic instructions to the NIOS arch
  • debugging support for Multithreading by fixing "gdbserver" instead of falling back to "gdbserver (old)"
  • "thread" keyword in gcc

GDB

  • remote debugging user space application via  Kernel based GDB stub
    • fixing "gdbserver" instead of falling back to "gdbserver (old)"
    • using a serial link alternatively to Ethernet
    • debugging Multi-threaded Applications does not seem to be possible at all (very high priority !)
    • integration in NIOS II Studio
  • debugging the Kernel and Kernel modules
    • integration in NIOS II Studio

Documentation

  • "make help" should create a decent output. At least listing the available make targets including the "_only" and "_clean" stuff.
  • how to modify the various real-time configuration files
    • RC (easy: /vendor)
    • passwd (easy: /vendor)
    • initd.conf
    • services
    • stuff in vendors/Altera/nios2nommu/romfs_list
    • ...
  • inittab / rc
    === see appropriate Wiki page ===
  • how to save the Kernel and application/library configuration in a way that it survives a "git checkout -f" or "git clean -d" or "make real_clean" (easy: "make menuconfig" -> "Update Default Vendor Settings") noves the configguration files into /Vendor)
  • ...

Politics 

  • Have Altera and/or SLS and/or WindRiver mirror (or run) the GIT server (with HTTP support)
  • Communicate with SLS and/or WindRiver about company <-> community collaboration and preserving a common code base (especially regarding the MMU-enabled tiool suite)
  • Suggest NIOS arch for inclusion into the main line Kernel
  • Method to assign to-do issues to programmers and to track progress
  • A great deal of the necessary documentation is not specific to the NIOS arch. There should be a central uCLinux-dist documentation Wiki for that.

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