[PATCH v6 3/6] riscv: Provide a mechanism to fix DT for reserved memory

[Bin Meng]

On Sun, Apr 19, 2020 at 3:32 AM Atish Patra <atish.patra at wdc.com> wrote:
>
> In RISC-V, M-mode software can reserve physical memory regions
> by setting appropriate physical memory protection (PMP) csr. As the
> PMP csr are accessible only in M-mode, S-mode U-Boot can not read
> this configuration directly. However, M-mode software can pass this
> information via reserved-memory node in device tree so that S-mode
> software can access this information.
>
> This patch provides a framework to copy to the reserved-memory node
> from one DT to another. This will be used to update the DT used by
> U-Boot and the DT passed to the next stage OS.
>
> Signed-off-by: Atish Patra <atish.patra at wdc.com>
> Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
> ---
>  arch/riscv/cpu/start.S                |   1 +
>  arch/riscv/include/asm/global_data.h  |   1 +
>  arch/riscv/include/asm/u-boot-riscv.h |   2 +
>  arch/riscv/lib/Makefile               |   1 +
>  arch/riscv/lib/asm-offsets.c          |   1 +
>  arch/riscv/lib/fdt_fixup.c            | 102 ++++++++++++++++++++++++++
>  6 files changed, 108 insertions(+)
>  create mode 100644 arch/riscv/lib/fdt_fixup.c
>

Tested-by: Bin Meng <bmeng.cn at gmail.com>