On Wed, 19 Nov 2025 at 11:46, Adriana Nicolae <[email protected]> wrote: > > From: adriana <[email protected]> > > The Linux kernel can discover SMBIOS tables through two primary methods: > 1. Via EFI tables, when using EFI boot; > 2. Via the 'smbios3-entrypoint' property in the /chosen node of the > device tree. > > When U-Boot boots a Linux kernel using a non-EFI command ("bootm", > "bootz", or "booti"), the kernel relies on the device tree to detect > the hardware. If SMBIOS tables are available in U-Boot, they should > be passed to the kernel via this device tree property. > > This patch modifies boot_fdt_prepare(), to inject the SMBIOSv3 table > address into the device tree if there is a table generated by U-boot. > The "board_fdt_chosen_smbios" is weak in order to leave the possibilty > for specific boards to select custom SMBIOS addresses. > > The changes in this patch are added in the context of supporting this > device tree property in linux kernel: > https://lkml.org/lkml/2025/10/24/1393 > > Device tree schema was updated to include the "smbios3-entrypoint" node > in pull request: https://github.com/devicetree-org/dt-schema/pull/177 > > Signed-off-by: Adriana Nicolae <[email protected]> > --- > Changes in v4: > - Remove weak function board_fdt_chosen_smbios(), replace with > gd_smbios_start(); > - Return -EAGAIN in test if GENERATE_SMBIOS_TABLE is not enabled; > - Remove unnecessary fdt cleanup at the end of the test; > - Added missing newlines at the end of the modified files. > > Changes in v3: > - Moved "board_fdt_chosen_smbios" function to lib/smbios.c > - Return physical address of smbios entry and use map_sysmem to > access the entry point; > - Removed check for config enabled and added check for > GENERATE_SMBIOS_TABLE; > - Add test to check that smbios entry address is added into fdt; > > Changes in v2: > - Renamed device tree property to "smbios3-entrypoint". > - Removed redundant check for CONFIG_SMBIOS. > --- > boot/fdt_support.c | 19 ++++++++++++++++++ > test/dm/fdtdec.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 67 insertions(+) >
Reviewed-by: Simon Glass <[email protected]>
