Hi, On 07/04/2025 10:19, Jorge Ramirez-Ortiz wrote:
Some platforms might require the external fdt to boot.
Why ? we may want to build the fdt in, and discard the external fdt for some reasons.
This change provides a mechanism to the board initializaion code to make the requet explicit. Signed-off-by: Jorge Ramirez-Ortiz <jorge.rami...@oss.qualcomm.com> --- arch/arm/mach-snapdragon/board.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/arm/mach-snapdragon/board.c b/arch/arm/mach-snapdragon/board.c index 2ef936aab75..1bca9dce20f 100644 --- a/arch/arm/mach-snapdragon/board.c +++ b/arch/arm/mach-snapdragon/board.c @@ -150,7 +150,13 @@ static void show_psci_version(void) /* We support booting U-Boot with an internal DT when running as a first-stage bootloader * or for supporting quirky devices where it's easier to leave the downstream DT in place * to improve ABL compatibility. Otherwise, we use the DT provided by ABL. + * + * Alternatively the board can enforce the external fdt. */ +bool __weak qcom_board_fdt_external(void) +{ + return false; +} int board_fdt_blob_setup(void **fdtp) { struct fdt_header *fdt; @@ -161,6 +167,12 @@ int board_fdt_blob_setup(void **fdtp) external_valid = fdt && !fdt_check_header(fdt); internal_valid = !fdt_check_header(*fdtp);+ if (qcom_board_fdt_external() && external_valid) {+ debug("Using external FDT\n"); + *fdtp = fdt; + goto out; + } + /* * There is no point returning an error here, U-Boot can't do anything useful in this situation. * Bail out while we can still print a useful error message. @@ -178,6 +190,7 @@ int board_fdt_blob_setup(void **fdtp) *fdtp = fdt; }+out:/* * Parse the /memory node while we're here, * this makes it easy to do other things early.
