On Mon, 6 Apr 2020 at 22:45, Atish Patra atish.patra@wdc.com wrote:
This series adds few DT related fixes required for Linux EFI stub to work on RISC-V.
I'm not sure how this is supposed to work, since DT reserved memory regions are not used by EFI. If you want to reserve memory on a UEFI system, you have to reserve it in the UEFI memory map from firmware. The DT reserved-memory node is taken into account too late, the /memreserve/ entries are ignored entirely.
Patch 1 adds the boot hartid property under /chosen node. The related discussion can be found here.
https://patchwork.ozlabs.org/patch/1233664/ https://lists.denx.de/pipermail/u-boot/2020-March/402085.html
Patch 2 fixes a generic issue in fdtdec related to reserved memory node.
Patch 3,4,5 provide one of the option to update reserved-memory node for next stage. It depends on master OpenSBI branch.
The other options are SBI extension and trap/emulate on PMP csr access. The detaild discussion can be found here. https://github.com/riscv/riscv-sbi-doc/pull/37
Patch 1 & 2 can be applied independently from 3 and 4. I want to keep all the patches together to provide a holistic view of changes required for RISC-V UEFI.
Changes v4->v5:
- Added comments for new functions.
Changes v3->v4:
- Dropped generic efi fix patch as it is already merged.
- Moved all the fdt fixups to a common file.
- Addressed few nit comments.
Changes from v2->v3:
- Update the DT meant for OS if it is different from the one used by U-Boot
- Use different FDT api to obtain "reg" address & size to honor the cell count.
Changes from v1->v2:
- Fix the issue if chosen node is not present.
Changes from previous version:
- Renamed the DT node property to "boot-hartid" from "efi-boot-hartid".
- Changed the property type to u32 instead of u64 for RV32 compatibility.
Atish Patra (6): riscv: Add boot hartid to Device tree fdtdec: Fix boundary check riscv: Provide a mechanism to fix DT for reserved memory riscv: Setup reserved-memory node for FU540 riscv: Copy the reserved-memory nodes to final DT riscv: Move all fdt fixups together
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/bootm.c | 5 - arch/riscv/lib/fdt_fixup.c | 150 ++++++++++++++++++++++++++ configs/sifive_fu540_defconfig | 1 + lib/fdtdec.c | 3 +- 9 files changed, 159 insertions(+), 6 deletions(-) create mode 100644 arch/riscv/lib/fdt_fixup.c
-- 2.25.1