[MIPS P8700 v6 0/7] Add MIPS P8700 support to generic platform

[Anup Patel]

On Fri, May 23, 2025 at 2:51 AM Chao-ying Fu <icebergfu at gmail.com> wrote:
>
> ---
> Changes in v6:
>   Drop the dts file.
>   Drop the entry function.
>   Add a new platform pma_set function.
>   Move PMA code to MIPS p8700.c.
>
> Changes in v5:
>   Drop the amo emulation code.
>   Change to use macros to insert instructions in p8700.c.
>   Add 3 new patches to recognize mmio regions and set up cacheability based on
>   mmio regions.
>
> Changes in v4:
>   Remove code that overrides nascent_init.
>   Update p8700.c to work with the latest override.
>   Use csr_set for mipsconfig6 in p8700.c.
>   Add riscv,cbom-block-size to the dts file.
>
> Changes in v3:
>   Remove stw.s, stw.h, and extra scratch space.
>   Use nascent_init to initialze MIPS CSRs.
>   Add amo emulation via illegal instruction exceptions.
>   Change to use AMO and RDTIME illegal instruction exceptions.
>   Revise the dts file.
>   Remove code that jumps to mips_cps_core_entry.
>
> Changes in v2:
>   Break up one patch to 11 patches.
>
> Changes in v1:
>   Original code.
> ---
>
> Chao-ying Fu (5):
>   platform: generic: mips: add P8700
>   platform: generic: mips: add header files
>   platform: generic: mips: add the platform file
>   platform: generic: mips: add objects.mk
>   lib: sbi_platform: Add the platform pma_set function to set up
>     cacheability
>
> Vladimir Kondratiev (2):
>   devices to use MMIO memory
>   Convey MMIO flag as specified by SBI_DOMAIN_MEMREGION_MMIO
>
>  include/sbi/riscv_asm.h                 |   2 +
>  include/sbi/sbi_platform.h              |  19 ++
>  lib/sbi/riscv_asm.c                     |   3 +
>  lib/sbi/sbi_hart.c                      |  13 +
>  lib/utils/fdt/fdt_fixup.c               |   2 +-
>  platform/generic/Kconfig                |   4 +
>  platform/generic/configs/defconfig      |   1 +
>  platform/generic/include/mips/board.h   |  33 +++
>  platform/generic/include/mips/mips-cm.h |  88 ++++++
>  platform/generic/include/mips/p8700.h   | 113 ++++++++
>  platform/generic/mips/objects.mk        |   6 +
>  platform/generic/mips/p8700.c           | 361 ++++++++++++++++++++++++
>  12 files changed, 644 insertions(+), 1 deletion(-)
>  create mode 100644 platform/generic/include/mips/board.h
>  create mode 100644 platform/generic/include/mips/mips-cm.h
>  create mode 100644 platform/generic/include/mips/p8700.h
>  create mode 100644 platform/generic/mips/objects.mk
>  create mode 100644 platform/generic/mips/p8700.c
>

I have squashed the first 4 patches into one patch and applied
to the riscv/opensbi repo. I have also made sure that p8700
only compiles for RV64 because it does not compile for RV32.

The remaining three patches need more reviews.

Thanks,
Anup