TODO

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m (Upstream PA-RISC-related kernel patch history)
m (PA-RISC Linux TODO (actually this is Helge's TODO list))
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= PA-RISC Linux TODO (actually this is Helge's TODO list) =
 
= PA-RISC Linux TODO (actually this is Helge's TODO list) =
  
== Status & TODO 2022-01-22 ==
+
== Status & TODO 2022-02-16 ==
 
* STARTED: [https://patchwork.kernel.org/project/linux-parisc/patch/20211031204952.25678-2-svens@stackframe.org/ Visualize FX framebuffer/DRM support (by Sven Schnelle)]
 
* STARTED: [https://patchwork.kernel.org/project/linux-parisc/patch/20211031204952.25678-2-svens@stackframe.org/ Visualize FX framebuffer/DRM support (by Sven Schnelle)]
 +
* STARTED: Implement kernel [[VDSO]] support - https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/log/?h=vdso
 +
* [https://lore.kernel.org/linux-parisc/4544A34A.6080700@tausq.org/ Randolphs patch]
 +
** Get rid of executable stack, maybe use gateway page instead for signal returns?
 +
** 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 http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=18ad51dd342a7eb09dbcd059d0b451b616d4dafc
 
* Fix kernel: make ARCH=parisc tools/perf
 
* Fix kernel: make ARCH=parisc tools/perf
* Fix mouse in qemu (HP-UX) - reported by Stefano Repici, proposed patch: https://github.com/hdeller/qemu-hppa/commit/87a657982449d5a0fa44fbb741e6276bb7f1e7c4
 
* STARTED: Implement TOC in qemu
 
 
* Add Linux kernel PIM driver - /sys/firmware/pim/*
 
* Add Linux kernel PIM driver - /sys/firmware/pim/*
* SeaBIOS: Add bigger font to STI ROM
+
* Clean up drivers/parisc/iosapic.c  and drivers/parisc/sba_iommu.c (Mail from Carlos Bilbao)
* qemu build issues
+
* parisc timers: convert to generic clockevent (Arnd Bergmann) - https://patchwork.kernel.org/project/linux-parisc/patch/20201008154651.1901126-14-arnd@arndb.de/
 +
* Add BPF assembler implementation
 +
* Enable SPARSEMEM_VMEMMAP_ENABLE
 +
* ONGOING: Enable UBSAN and fix fallouts
 +
* STARTED: implement CONFIG_VMAP_STACK "virtually mapped stacks and thread_info cleanup" -> https://lwn.net/Articles/693026/
 +
* Check if https://lkml.org/lkml/2020/7/23/1246 was added to avoid TLB stalls (commits https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c6fe44d96fc1536af5b11cd859686453d1b7bfd1 and https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2a9127fcf2296674d58024f83981f40b128fffea) - kernel v5.9 seems good.
 +
* STARTED by Sven: Fix kexec on PA8800/PA8900 CPUs: how to restart the CPUs on these systems?
 +
* QEMU issues:
 +
** Add pvpanic kernel support? - maybe?
 +
** Fix mouse completely with X11 sources
 +
** qemu: Check "HPPA support for IGNITE-UX install discs" for HP Logic Analyzer 16700A (Mail from Keith Monahan <keith@techtravels.org> Sept 2020)
 +
*** ncr53c710 driver from amiga: https://github.com/tonioni/WinUAE/blob/master/qemuvga/lsi53c710.cpp
 +
*** Check "IGNITE-UX install discs" from Keith Monahan (09/20)
 +
** STARTED: Finish LASI and 82596 NIC for QEMU -> https://github.com/hdeller/qemu-hppa/commits/lasi
 +
** Track [https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=970460 qemu-user: trashes argv0 breaking multi-call binaries] QEMU bug.
 +
** Because of this bug, qemu-user still has build-problems with those packages: lilypond, fceux, perl, sane-backends
 
** Check qemu bug: https://gitlab.com/qemu-project/qemu/-/issues/635
 
** Check qemu bug: https://gitlab.com/qemu-project/qemu/-/issues/635
 
** qemu and executable stack: The following error occurred on pacific in mlton build: /usr/lib/mlton/mlton-compile: error while loading shared libraries: libm.so.6: cannot enable executable stack as shared object requires: Invalid argument
 
** qemu and executable stack: The following error occurred on pacific in mlton build: /usr/lib/mlton/mlton-compile: error while loading shared libraries: libm.so.6: cannot enable executable stack as shared object requires: Invalid argument
Line 14: Line 31:
 
** libime fails to build on real hardware but builds with qemu!
 
** libime fails to build on real hardware but builds with qemu!
 
** It looks like haskell packages still fail on qemu (e.g., haskell-swish).
 
** It looks like haskell packages still fail on qemu (e.g., haskell-swish).
** kdenlive = Illegal instruction
+
** STARTED: qemu bug building gcc-arm-none-eabi: https://buildd.debian.org/status/fetch.php?pkg=gcc-arm-none-eabi&arch=hppa&ver=15%3A10.3-2021.07-1&stamp=1633455020&raw=0
** Illegal instruction: https://buildd.debian.org/status/fetch.php?pkg=haruna&arch=hppa&ver=0.6.3.1-1&stamp=1641027396&raw=0
+
* JAVA
* __muldi3 routine in libgcc.a in kernel uses xmpyu FP instruction (qgis mail) -> bad! -> add linker check?
+
** Finish OpenJDK, see patch and mail from Adrian Glaubitz 05.02.2021.
** https://patchwork.kernel.org/project/linux-parisc/patch/YWSSVwQ9tc9YaC+f@ls3530/
+
** From Adrian Glaubitz (9/29/2021): The Rust project merged a change [1] that allows rustc to use GCC instead of LLVM as codegen backend for generating machine code through libgccjit. This means that we are in principal able now to build Rust code for all the architectures that GCC support but LLVM doesn't, which includes hppa. Please see this [2] and this [3] comment to see how to get started with cross-building the Rust compiler for a new target using libgccjit. We will have to add these new architectures to the libc crate first, see an example PR for that here [4]. Since I can't work on all these targets myself, I wanted to ask you to help me and get the support for hppa added to libc and rustc where necessary.
** 64bit kernel still needs patches (or gcc fix from Dave)
+
*** [1] https://github.com/rust-lang/rust/pull/87260
* STARTED: qemu bug building gcc-arm-none-eabi: https://buildd.debian.org/status/fetch.php?pkg=gcc-arm-none-eabi&arch=hppa&ver=15%3A10.3-2021.07-1&stamp=1633455020&raw=0
+
*** [2] https://github.com/rust-lang/rust/pull/87260#issuecomment-930221503
** same for abinit: https://buildd.debian.org/status/fetch.php?pkg=abinit&arch=hppa&ver=9.6.1-1&stamp=1634170491&raw=0
+
*** [3] https://github.com/rust-lang/rust/pull/87260#issuecomment-930223504
** Fixed: https://lists.nongnu.org/archive/html/qemu-devel/2021-12/msg04501.html
+
*** [4] https://github.com/rust-lang/libc/pull/2414
/tmp/cceXP0uE.s: Assembler messages:
+
/tmp/cceXP0uE.s:1493: Error: Invalid Shift/Extract/Deposit Condition.
+
/tmp/cceXP0uE.s:1493: Error: Undefined absolute constant: '.loc'.
+
/tmp/cceXP0uE.s:1493: Error: Field out of range [0..31] (-1).
+
/tmp/cceXP0uE.s:1493: Error: Invalid operands
+
make[4]: *** [Makefile:1117: alias.o] Error 1
+
* From Adrian Glaubitz (9/29/2021): The Rust project merged a change [1] that allows rustc to use GCC instead of LLVM as codegen backend for generating machine code through libgccjit. This means that we are in principal able now to build Rust code for all the architectures that GCC support but LLVM doesn't, which includes hppa. Please see this [2] and this [3] comment to see how to get started with cross-building the Rust compiler for a new target using libgccjit. We will have to add these new architectures to the libc crate first, see an example PR for that here [4]. Since I can't work on all these targets myself, I wanted to ask you to help me and get the support for hppa added to libc and rustc where necessary.
+
** [1] https://github.com/rust-lang/rust/pull/87260
+
** [2] https://github.com/rust-lang/rust/pull/87260#issuecomment-930221503
+
** [3] https://github.com/rust-lang/rust/pull/87260#issuecomment-930223504
+
** [4] https://github.com/rust-lang/libc/pull/2414
+
* Clean up drivers/parisc/iosapic.c  and drivers/parisc/sba_iommu.c (Mail from Carlos Bilbao)
+
* QEMU issues:
+
** Track [https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=970460 qemu-user: trashes argv0 breaking multi-call binaries] QEMU bug.
+
** Because of this bug, qemu-user still has build-problems with those packages: lilypond, fceux, perl, sane-backends
+
* Finish OpenJDK, see patch and mail from Adrian Glaubitz 05.02.2021.
+
* parisc timers: convert to generic clockevent (Arnd Bergmann) - https://patchwork.kernel.org/project/linux-parisc/patch/20201008154651.1901126-14-arnd@arndb.de/
+
* qemu: Check "HPPA support for IGNITE-UX install discs" for HP Logic Analyzer 16700A (Mail from Keith Monahan <keith@techtravels.org> Sept 2020)
+
** ncr53c710 driver from amiga: https://github.com/tonioni/WinUAE/blob/master/qemuvga/lsi53c710.cpp
+
* Check if https://lkml.org/lkml/2020/7/23/1246 was added to avoid TLB stalls (commits https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c6fe44d96fc1536af5b11cd859686453d1b7bfd1 and https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2a9127fcf2296674d58024f83981f40b128fffea) - kernel v5.9 seems good.
+
* STARTED by Sven: Fix kexec on PA8800/PA8900 CPUs: how to restart the CPUs on these systems?
+
 
* upgrade libgcc via:
 
* upgrade libgcc via:
 
** apt install -f -o Dpkg::Options::="--force-overwrite"
 
** apt install -f -o Dpkg::Options::="--force-overwrite"
 
** see: https://raphaelhertzog.com/2011/08/01/understanding-dpkgs-file-overwrite-error/
 
** see: https://raphaelhertzog.com/2011/08/01/understanding-dpkgs-file-overwrite-error/
* qemu
 
** Check "IGNITE-UX install discs" from Keith Monahan (09/20)
 
** Add pvpanic kernel support? - maybe?
 
** STARTED: Finish LASI and 82596 NIC for QEMU -> https://github.com/hdeller/qemu-hppa/commits/lasi
 
* Probably fixed: Fix stifb kernel hangs with latest kernels (4.9ff)
 
* Add BPF assembler implementation
 
* Enable SPARSEMEM_VMEMMAP_ENABLE
 
* ONGOING: Enable UBSAN and fix fallouts
 
* STARTED: implement CONFIG_VMAP_STACK "virtually mapped stacks and thread_info cleanup" -> https://lwn.net/Articles/693026/
 
* PALO - add regular rewind & load to avoid tftp boot timing issues. See mail from Frank Schreiner "PALO issues" (Dec 2018).
 
* STARTED: Implement kernel VDSO support - https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/log/?h=vdso
 
** [https://lore.kernel.org/linux-parisc/4544A34A.6080700@tausq.org/ Randolphs patch]
 
** [[Vdso]]
 
*** Get rid of executable stack, maybe use gateway page instead for signal returns?
 
*** 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 http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=18ad51dd342a7eb09dbcd059d0b451b616d4dafc
 
 
* STARTED: convert old-style rtc driver drivers/input/misc/hp_sdc_rtc.c to new RTC model, remove the procfs and miscdevice interfaces first and replace the ioctl with a struct rtc_class_ops. Arnd Bergmann can review those patches, but Alexandre and Alessandro are the ones who would merge them once the driver is moved to drivers/rtc. (Mail from Arnd Bergmann, 28.04.2016) - see https://patchwork.kernel.org/patch/10701397/
 
* STARTED: convert old-style rtc driver drivers/input/misc/hp_sdc_rtc.c to new RTC model, remove the procfs and miscdevice interfaces first and replace the ioctl with a struct rtc_class_ops. Arnd Bergmann can review those patches, but Alexandre and Alessandro are the ones who would merge them once the driver is moved to drivers/rtc. (Mail from Arnd Bergmann, 28.04.2016) - see https://patchwork.kernel.org/patch/10701397/
 
* check usage of CONFIG_MLONGCALLS, only 14MB/s with debian kernel and dd if=/dev/zero of=here bs=1k count=100000  ?
 
* check usage of CONFIG_MLONGCALLS, only 14MB/s with debian kernel and dd if=/dev/zero of=here bs=1k count=100000  ?
 
* Add some cond_resched() calls to avoid RCU stalls, see commit 2a8bc5316adc998951e8f726c31e231a6021eae2
 
* Add some cond_resched() calls to avoid RCU stalls, see commit 2a8bc5316adc998951e8f726c31e231a6021eae2
 
* MAYBE: Implement DCACHE_WORD_ACCESS in kernel (Complaint from Linus)
 
* MAYBE: Implement DCACHE_WORD_ACCESS in kernel (Complaint from Linus)
* Fix kernel to load -fpie compiled programs not at 0x400000 (ELF_ET_DYN_BASE, e.g. https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.9.y&id=abb79a56898e044715d8efd07bc1902d27a94870)
 
 
* gcc optimizations:
 
* gcc optimizations:
 
** _mcount can be optimized (smaller) by not subtracting offset)
 
** _mcount can be optimized (smaller) by not subtracting offset)
Line 72: Line 52:
 
* Enable BlockTLB on PA1.x for STI framebuffer (see block tlb info in sti.pdf documentation) and ftp://parisc.parisc-linux.org/docs/pdc32.pdf
 
* Enable BlockTLB on PA1.x for STI framebuffer (see block tlb info in sti.pdf documentation) and ftp://parisc.parisc-linux.org/docs/pdc32.pdf
 
* convert unaligned handler to use get_user/put_user inline asm
 
* convert unaligned handler to use get_user/put_user inline asm
* Fix boot crash from Al Viro with sti gfx card (24.03.17) (probably fixed in the meantime)
 
 
* debian parisc perl bug (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721537) shows that mmap on parisc linux is horribly inefficient.  We allocate huge maps for small files. This should be improved. Mailthread: " parisc mmap: private file maps" ,http://www.spinics.net/lists/linux-parisc/msg05083.html  or  https://rt.perl.org/Public/Bug/Display.html?id=119567  https://rt.perl.org/Public/Bug/Display.html?id=119567  
 
* debian parisc perl bug (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721537) shows that mmap on parisc linux is horribly inefficient.  We allocate huge maps for small files. This should be improved. Mailthread: " parisc mmap: private file maps" ,http://www.spinics.net/lists/linux-parisc/msg05083.html  or  https://rt.perl.org/Public/Bug/Display.html?id=119567  https://rt.perl.org/Public/Bug/Display.html?id=119567  
 
* unaligned warning (from glibc) when running apt-get: https://sourceware.org/bugzilla/show_bug.cgi?id=20243
 
* unaligned warning (from glibc) when running apt-get: https://sourceware.org/bugzilla/show_bug.cgi?id=20243
Line 138: Line 117:
 
    
 
    
 
* palo (PA-RISC Boot Loader):
 
* palo (PA-RISC Boot Loader):
 +
** PALO - add regular rewind & load to avoid tftp boot timing issues. See mail from Frank Schreiner "PALO issues" (Dec 2018).
 
** When listing directory contents, resolve and print symlink target file names too, e.g. "vmlinux -> linux-5.12.1-64bit".
 
** When listing directory contents, resolve and print symlink target file names too, e.g. "vmlinux -> linux-5.12.1-64bit".
 
** Fix palo deb package to build iplboot natively (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851792)
 
** Fix palo deb package to build iplboot natively (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851792)
Line 1,022: Line 1,002:
 
* QEMU:
 
* QEMU:
 
** DONE: Add kernel fw_cfg support (drivers/firmware/qemu_fw_cfg.c)
 
** DONE: Add kernel fw_cfg support (drivers/firmware/qemu_fw_cfg.c)
 +
** DONE: Fix mouse in with HP-UX 10 and 11 - reported by Stefano Repici
 +
** DONE: Add bigger font to STI ROM / SeaBIOS
 +
** DONE: Implement TOC in qemu (via qemu monitor -> NMI)
  
 
== ABI breakages (e.g. dropped HP-UX support) ==
 
== ABI breakages (e.g. dropped HP-UX support) ==

Revision as of 13:17, 16 February 2022

Contents

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

Status & TODO 2022-02-16

  • Kernel: still missing Linux kernel development (no patches available yet):
    • maybe implement transparent huge pages (due to cache coherency technically only possible on PA8500-PA8700 CPUs, not possible on PA8800-PA8900 CPUs)
    • optimize flush_dcache_page() implementation like sparc. See Documentation/cachetlb.txt, e.g. used in aio subsystem
    • NO_IRQ -> should be converted to (0) instead of (-1) -> Helge (check assembly, check in drivers/parisc/*)
    • 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.
  • Kernel: Low priority patches needs further work
    • disable FP-register save/restore at kernel entry? - https://patchwork.kernel.org/patch/3975291/
    • 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 (maybe ask Dennis Clarke <dclarke@blastwave.org>, Jan 2019).
    • implement BUG() and WARN() with inline assembly so that interrupt happens in delay branch of "or,<> %r0,cond,%r0". Probably not possible, because gcc will report "control reaches end of non-void function" warnings/errors.
  • 64-bit userspace support (from Dave Anglin, Nick Hudson):
    • 64-bit userspace, Binutils 64-bit binutils needs to be fixed to get multiple stub section support.
    • glibc port (hppa64 can use the generic thread code)
    • 64-bit support in gcc is probably pretty good as 64-bit HP-UX works fine.
    • gdb could be a problem due to a lack of a maintainer.
  • Debian packages / Userspace work
    • IMPORTANT: fix OpenJDK - fixes required in zeroport (stack grows up!).
    • gcc -> join 32- and 64bit compiler, make "-m64" work, get rid of hppa64-linux-gnu-gcc
  • userspace
  • palo (PA-RISC Boot Loader):
    • PALO - add regular rewind & load to avoid tftp boot timing issues. See mail from Frank Schreiner "PALO issues" (Dec 2018).
    • When listing directory contents, resolve and print symlink target file names too, e.g. "vmlinux -> linux-5.12.1-64bit".
    • Fix palo deb package to build iplboot natively (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851792)
    • Modify (if possible), that palo can read (sequential) tftpbootable-vmlinuxes as well as the current boot-vmlinux images (simplifies build/handling)

Upstream PA-RISC-related kernel patch history

Debian kernel and userspace programs

Debian kernel / Generic Kernel bugs fixed

    • DONE: Fixed 64bit SMP kernel & sticon on machines with more than 4GB RAM (Kernel 3.12)
    • DONE: Lots of syscall fixes regarding compat kernel
    • DONE: send patches to remove UP from debian kernels, use sil680 instead of siimage, see http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721191 -> fixed in 3.12 / 3.13
    • DONE: Enable BMC in c8000 default kernel config - ipmi driver (CONFIG_IPMI_HANDLER=y) - http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=747482
    • DONE: remove HIL RTC from debian kernel - it creates a backtrace at boot because we have already another rtc0 active.
    • DONE: add ppdev driver, needed by CUPS, systemd reports missing module load (3.17 & 3.16 kernel)
    • DONE: 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
    • DONE: Drop HPUX-support from kernel (Kernel 4.0)
    • DONE: implemented HUGE pages
    • DONE: kernel timerfd_settime/timerfd_gettime issue, test with debian package: liblinux-fd-perl -> https://patchwork.kernel.org/patch/7951661/, backported to all kernels
    • DONE: kernel ptrace bug: http://thread.gmane.org/gmane.linux.ports.parisc/26273, possible fix: https://patchwork.kernel.org/patch/8063301/
    • DONE: Implement CONFIG_DEBUG_STACK_USAGE, in kernel 4.6
    • DONE: Use 32bit exception table entries, in kernel 4.6
    • DONE: implemented seccomp syscal, including SECCOMP_MODE_STRICT and mode 2
    • DONE: Fixed FTRACE support (http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=366dd4ea9d5f0eb78fdf4982d76506f99480ec0a)
    • DONE: Add syscall ftrace support
    • DONE: Simplify get_user()/put_user() with regard to %sr0/%sr2 usage.
    • DONE: Add tracehook support (needed for seccomp testcases, gdb, ...)
    • DONE: Added high-resolution sched_clock clocksources in 4.7, needed for debian packages: ismrmrd, haskell-http-conduit, ...
    • DONE: Detect physically broken memory via Page Deallocation Table (PDT), initial support in kernel 4.13
    • DONE: Make kernel self-decompressing (instead of palo reading gzipped kernels)
    • DONE: fix %pF and %pS usage in all kernel code
    • DONE: Enabled BMC/IPMI including Remote power on/off on C8000 and rp3410 machines (kernel 4.17 and above)
    • DONE: use CONFIG_COMPAT_BINFMT_ELF and get rid of arch/parisc/kernel/binfmt_elf32.c
    • DONE: Fix kernel writing core file, gdb reporting: BFD: Warning: /tmp/core.http.1655.ls3011.1465554447 is truncated: expected core file size >= 2187264, found: 2121728.
    • DONE: Find way to extract vmlinux out of vmlinuz (Kernel 4.19)
    • DONE: Implement alternative coding for UP & SMP, one debian kernel for UP and SMP, optimizations to avoid cache flushes on cache-less systems and other qemu-related speed-ups to avoid unnecessary syncronization (Kernel 4.20)
    • DONE: IRQ Balancing was broken, http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f73493eb4aecdd6edd8a749890e6e2dcfa0a7978
    • DONE: Added kgdb and kprobes in kernel 5.2, by Sven Schnelle
    • DONE: report on C8000 one socket with 2 cores
    • DONE: Check Kernel boot code if RAM of machine is big enough (e.g. is booting on 710 machine with 60MB possible?) - https://patchwork.kernel.org/patch/10888283/
    • DONE: convert to SPARSEMEM, instead of DISCONTIGMEM
    • DONE: (NOT POSSIBLE:) Enable huge pages on kernel text for C8000 as well - not possible, will crash due to required equivalent aliasing of caches.
    • DONE: Enable __ro_after_init
    • DONE: add dynamic ftrace support - provided by Sven in kernel 5.3
    • DONE: Fix fallouts from strace: http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b7dc5a071ddf69c0350396b203cba32fe5bab510,
    • DONE: implement kexec syscall
    • DONE: Analyze futex hang (CPU soft lockup) situation with test-lock testcase in the libprelude debian package - fixed by parisc: Add atomic64_set_release() define to avoid CPU soft lockups
    • DONE: Add TOC handler, sending TOC via IPMI interface "toc s"
    • DONE: autofs/automounter is broken, patch sent to list, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892953
  • QEMU:
    • DONE: Add kernel fw_cfg support (drivers/firmware/qemu_fw_cfg.c)
    • DONE: Fix mouse in with HP-UX 10 and 11 - reported by Stefano Repici
    • DONE: Add bigger font to STI ROM / SeaBIOS
    • DONE: Implement TOC in qemu (via qemu monitor -> NMI)

ABI breakages (e.g. dropped HP-UX support)

Considerations between Debian unstable and Debian Jessie release

Jessie was not stable on SMP machines, particularly those with PA8800/PA8900 processors. It's recommended to use kernel 4.4.15 or later. The current default gcc for unstable is gcc 5.4. Most hppa fixes have been back ported to 4.9 but not all. It shouldn't hurt to use binutils from unstable. Debian glibc 2.23 is best. Most old packages should still work although there maybe inequivalent aliasing issues which are relevant on PA8800. There's also a nasty issue with gmon_start being in every shared library in Jessie. This caused a few headaches and potentially breaks applications when it's removed from a library. If you stick with the glibc in Jessie, multithreaded applications may not work as well as they could, but maybe that's not important. The kernel update is the most important one. Since hppa moved to ports, there has been a huge number of bug fixes. System stability is dramatically improved and I believe more packages are available than ever before. It's better to run unstable and just be selective about running "apt-get upgrade". (by Dave Anglin)

parisc-linux.org Homepage and Debian build server infrastructure work

Linus Torvalds barking at parisc

Testsuites, kernel and userspace testing tools

TODO Drivers

  • 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!

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