[PATCH 0/5] RISC-V SPL: fix OpenSBI FULL FIT loading

Hi all,

This series improves CONFIG_SPL_LOAD_FIT_FULL support on RISC-V, primarily to enable loading OpenSBI as firmware and recording loadable images (e.g., U-Boot) into the FDT passed to the next boot stage. This aligns spl_load_fit_image() with the behaviour already present in spl_load_simple_fit().

Patch summary:

1/5: Allow IH_OS_OPENSBI in fit_image_load() so OpenSBI firmware can be loaded without error.

2/5: Enable spl_load_fit_image() for RAM boot when CONFIG_SPL_LOAD_FIT_FULL is selected.

3/5: Use map_sysmem() for FDT address handling to keep the code sandbox‑friendly.

4/5: Record loadables into spl_image->fdt_addr during FIT load, providing the entry addresses needed by subsequent stages (e.g., OpenSBI).

5/5: Add a unit test to verify that loadables are correctly recorded in the FDT.

Tested with provided sandbox test with a grafted FIT image containing OpenSBI (firmware), U‑Boot (loadable) and a DTB.

However some issues still present:

- This works only if FIT Image contains dtb blob, spl_load_simple_fit() on the other hand relocates gd->fdt_blob to the end of U-Boot;
  It's currently unclear to me if spl_load_fit_image() should do the same.
  
- I am not sure if sandbox test is a right thing to do, still i think it's better than relying on QEMU for testing in this case;

- We require grafted FIT as u-boot.img doesn't contains anything than U-boot Proper for sandbox;

Please advice.

Only one patch remained fro previous RFC series:
Link: https://lore.kernel.org/r/20260619-riscv-full-fit-image-support-v1-0-c6477cf4f410@maquefel.me

Signed-off-by: Nikita Shubin <[email protected]>
---
Nikita Shubin (5):
      image: fit: allow IH_OS_OPENSBI in fit_image_load()
      common: spl: ram: Add LOAD_FIT_FULL support
      spl: fit: Use map_sysmem() with buffers for fdt address
      spl: fit: Record loadables to spl_image->fdt_addr
      spl: fit: Add test to check loadables

 boot/image-fit.c      |   1 +
 common/spl/spl_fit.c  |  48 ++++++++++---
 common/spl/spl_ram.c  |  12 ++--
 test/image/spl_load.c | 195 ++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 241 insertions(+), 15 deletions(-)
---
base-commit: baa64b2f892890f00a377eac4a3e685472bb56b5
change-id: 20260731-riscv-full-fit-support-320d38f8311e

Best regards,
--  
Nikita Shubin