Re: Contributing to OpenRISC Linux

[Stafford Horne <shorne@gmail.com>]

Hi Sunil,

+CC List

yes, the cacheinfo task is still open.  There are many things that are still not
implemented in OpenRISC, you can always just look under the kernel
Documentation/features.

For example:

    < shorne@antec ~/work/linux > grep -r -e openrisc.*TODO Documentation/features | column -t
    Documentation/features/vm/huge-vmap/arch-support.txt:                |  openrisc:  |  TODO  |
    Documentation/features/vm/ELF-ASLR/arch-support.txt:                 |  openrisc:  |  TODO  |
    Documentation/features/vm/ioremap_prot/arch-support.txt:             |  openrisc:  |  TODO  |
    Documentation/features/vm/pte_special/arch-support.txt:              |  openrisc:  |  TODO  |
    Documentation/features/perf/kprobes-event/arch-support.txt:          |  openrisc:  |  TODO  |
    ...

How far have you come with OpenRISC so far?  If you haven't already I suggest
working through:

 - Get a simulator, I use QEMU for most development as it's faster and supports
   more memory than most FPGA.  Final verification can be done on an FPGA.
 - Get a working compiler toolchain.
 - Compile and boot the openrisc kernel.
 - Build a userspace environment, either buildroot, toybox or busybox.

I have some tools to help with this in or1k-utils [1], also there are prebuilt
environments and docs in the linux kernel [2] and qemu [3].

At the momoment, I am also thinking of what to work on next for OpenRISC, there is:

  - kexec
  - jump_label
  - kprobes
  - perf_events
  - ftrace

[1] https://github.com/stffrdhrn/or1k-utils
[2] https://docs.kernel.org/arch/openrisc/openrisc_port.html
[3] https://wiki.qemu.org/Documentation/Platforms/OpenRISC.

On Sat, Jan 11, 2025 at 05:51:17PM +0530, Sahil Siddiq wrote:
> Hi,
> 
> While hunting for project ideas related to Linux kernel
> development, I came across the "OpenRISC Linux Feature
> Development" [1] project on The FOSSi Foundation's GSoC
> page.
> 
> While I am not eligible to take part in GSoC, I am still
> interested in working on the tasks in this project. I
> noticed that progress has been made in adding rseq support
> [2]. However, I am unable to tell if progress has been
> made in the second task (reporting CPU details using the
> cacheinfo API).
> 
> If the second task is still open, I would like to give it
> a shot. I believe I'll get to learn a lot while working on
> this.
> 
> Thanks,
> Sahil
> 
> [1] https://fossi-foundation.org/gsoc/gsoc24-ideas#openrisc-linux-feature-development
> [2] https://lore.kernel.org/openrisc/20250110102248.3295944-1-shorne@gmail.com/T/#t
>