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PA-RISC Linux TODO (actually this is Helge's TODO list)

Updates for next newsletter

  • fixed 64bit SMP kernel & sticon on machines with more than 4GB RAM
  • Dave found O_SYNC bug in glibc (Typo in hppa __O_SYNC define in <bits/fcntl.h>)
  • syscall fixes with compat kernel
  • Migration
  • access
  • 3.13 with all patches in (coherency)
  • buildds running
  • wiki migration finished (05 Feb 2014)
  • old parisc-linux kernel mailinglist imported into - - 23 Nov 2014
  • parisc-linux domain is now owned by Helge (August 2014)

ABI breakages (HP-UX support)

Testsuites - to be checked

  • GLIBC issues:
  • We also have a problem with poll in rpcbind on 32-bit kernels. Runs forever. Not analyzed yet.
  • glib2.0 atomic bug: Dave: I see the problem building various packages -- apt is is one. It occurs when multiple dot processes are started by graph when package documentation is being generated. The number of dot processes spawned depends on the number of processors on the build system. However, the faults occur even on a UP system. I debugged one of these segvs enough to see that the problem occurred in a glib2.0 library. It's using the GCC "sync" interface.
  • From Dave: gcc thread issues including thread cancellation, glib2.0 problem, maybe __tls_get_addr clobber too?

Status & TODO 2015-02-22 (TODO-List by Helge Deller)

  • DONE: Drop HPUX-support from kernel
  • Implement ltrace on hppa
  • Fix octave build failure (libinterp/octave-value/ .................panic: Aborted -- stopping myself...)
  • DONE: debian-kernel: add ppdev driver, needed by CUPS, systemd reports missing module load. (3.17 & 3.16 kernel)
  • fix debian installer/partitioner to keep /boot below 2GB of size to prevent boot problems
  • fix VA randomization regarding to stack limits (testcase: ocaml build, temporarily fix: echo 0 > /proc/sys/kernel/randomize_va_space or add to /etc/sysctl.conf: sys.kernel.randomize_va_space = 0),
  • PARTLY DONE: push gcc patch for variable CAS (gcc atomic ops, __sync_XXX) upstream (Kernel 3.17, - packages needing rebuild: libatomic-ops, x265, ceph, firebird2.5, gauche, idba, mapsembler2, padevchooser
  • DONE: shmctl(0, SHM_INFO, (void *)&info) bug -> shows up/crashes debian procenv package ->
  • DONE: debian kernel: Add crc-modules, event, isofs, jfs, mouse, sata, sound, squashfs, udf, uinput, scsi-common, scsi-extra, loop, serial and usb-serial debian-installer packages
  • DONE: Kernel build problem: a) disable -mfast-indirect-calls in Makefile, b) gcc compiler bug in > gcc-4.8.3-3
  • further implement seccomp syscal, e.g. more modes than just: SECCOMP_MODE_STRICT
  • implement kexec syscall
  • use CONFIG_COMPAT_BINFMT_ELF and get rid of arch/parisc/kernel/binfmt_elf32.c
  • why does mc hangs when exiting on sticon ?
  • implement .con_font_set (consw) in sticon.c (to be able to change fonts at runtime)
  • modprobe ipmi_si loads the BMC driver, but it could be loaded automatically too..How to get CPU temp? (ipmi-chassis --get-chassis-status crashes the machine).
  • SLAB breaks, SLUB works, why? Mail from Guy Martin.
  • sparsemem: -> convert to sparsemem (, patch available from James
  • add wiki page about kernel cross-compiling
  • Kernel: Hard to solve outstanding issues
    • megaraid on my rp5470 hangs at boot (maybe because SCSI chassis not connected)? -> use new megaraid driver for debian
    • Fix FireGL X1/X3 in C8000 - currently broken (no DRM and software accel is incredibly slow plus colors in 24bpp mode are wrong seems ok in debian 8 sid / 3.16.7 kernel) - Info: manual "Radeon R5xx Acceleration" - and generic:
  • Kernel: still missing Linux kernel development (no patches available yet):
    • Fix FTRACE:
    • optimize flush_dcache_page() implementation like sparc. See Documentation/cachetlb.txt, e.g. used in aio subsystem
    • fix wrong _init notation in kernel
    • NO_IRQ -> should be converted to (0) instead of (-1) -> Helge (check assembly, check in drivers/parisc/*)
    • implement alternative coding for UP/SMP. See arch/x86/include/asm/alternative.h
    • check assembly in drivers/parisc/*
    • use pdc_add_valid() in kern_addr_valid(), protect against crashable acesses (like for superio-pc-drivers-detection in lp), add pdc_add_valid() to create a probe_kernel_read() implementation.
    • arch/parisc/kernel/sys_parisc.c -> use SYSCALL_ALIAS() -> maybe
    • on C8000, report 1 socket with 2 cores.
    • implement HUGE pages (or even better transparent huge pages)
    • Review gettimeofday and clock_gettime() implementation, possibly use a light-weight-syscall and rely on cr16 and cpu speed for more accurate timing? similiar to commit
  • Kernel: Low priority patches needs further work
    • Fix exception table entries to be of type int (32bit), even on 64bit kernel -> saves space. - - partly done.
    • disable FP-register save/restore at kernel entry? -
    • enable 16k/64k kernel page sizes (still cacheflushing-issues with SCSI driver, additional work in glibc needed to deal with >4k page size, e.g. ld-loader alignments of data/code segments)
    • Superdome support - can someone test? Should work better now with latest kernels.
    • task_struct/thread_info split -- task_struct should not be visible in entry.S, we need to move some items into thread_info -- this includes pt_regs and maybe some of the flags (ptrace, etc)
    • Visualize FX support (will probably never happen!)
  • Debian packaging work:
    • STARTED: Build real debian-installer CD. See:
    • DONE: we need a kernel debian package (3.10 based or higher)
    • DONE: debian-ports/parisc repository aka. syning debs to there
      • DONE: Helge to contact Aurelien (aurel32) on #debian-glibc on OFTC IRC
      • DONE: try to debootstrap from repository and add missing packages.
    • DONE: split repository on into stable (wheezy) and unstable (sid)
    • DONE: send patches to remove UP from debian kernels, use sil680 instead of siimage, see -> fixed in 3.12 / 3.13
  • Debian packages / Userspace work
    • DONE: qt4-x11: Improve atomic support on parisc (
    • IMPORTANT: fix OpenJDK - fixes required in zeroport (stack grows up!).
    • 64-bit userspace, 64-bit binutils needs to be fixed to get multiple stub section support.
    • gcc -> join 32- and 64bit compiler, make "-m64" work, get rid of hppa64-linux-gnu-gcc
  • Homepage migration:
    • DONE: Migration of website to
    • DONE: Migration of website to
    • DONE: Domain owner before: Matt Taggart <>, Expiration Date:09-Aug-2014; Since August 2014 is Helge Deller domain owner of
    • DONE: DNS takeover by Thibaut Varenet on 11/11/2013 - see:
    • DONE: former Server administrator of Dann Frazier -, former technical contact at HP:, Since August 2014 administrator/owner: Helge Deller
  • palo (PA-RISC Boot Loader):
    • Modify (if possible), that palo can read (sequential) tftpbootable-vmlinuxes as well as the current boot-vmlinux images (simplifies build/handling)
    • move decompression of Kernel to Linux kernel code instead of palo


Kernel patches

Debian kernel and userspace programs

  • Debian kernel
  • Debian installer:
    • DONE: test xorriso (Thomas Schmitt, scdbackup) and Debian infrastructure work

Kernel Testing Tools

TODO Drivers

  • IPMI support on rp-class / Support graceful shutdown from BMC on rp servers (`PC -GRACEFUL`)
  • write Lasi floppy driver
  • write Suckyio floppy driver
  • write spifi driver (rbrad)
  • modify ncr53c8xx driver for Outfield (735 & 755)
  • write GSC FDDI driver
  • write Timi ASIC (74x) support
  • EISA DMA support

Review all the todo entries below!

  • ns87415 dma doesn't work reliably on suckyio-systems
  • investigate not putting in extable entries for put_kernel_asm; will probably reduce kernel size
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