[PATCH v7 3/6] riscv: Provide a mechanism to fix DT for reserved memory
Bin Meng
bmeng.cn at gmail.com
Wed Apr 22 07:20:33 CEST 2020
On Wed, Apr 22, 2020 at 2:15 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>
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