From ca84ba63858a607fe2dabf56ed593d7808d2689d Mon Sep 17 00:00:00 2001 From: Caleb Connolly Date: Mon, 26 Feb 2024 17:26:05 +0000 Subject: [PATCH] arm: init: export prev_bl_fdt_addr When booting U-Boot on board with a locked down first-stage bootloader, we emulate the Linux boot header. By passing the U-Boot FDT through this first-stage bootloader and retrieving it afterwards we can pre-populate the memory nodes and other info like the KASLR address. Add a function to export the FDT addr so that boards can use it over the built-in FDT. Don't check is_addr_accessible() here because we might not yet have a valid mem_map if it's going to be populated from the FDT, let the board do their own validation instead. Reviewed-by: Tom Rini Reviewed-by: Sumit Garg Tested-by: Sumit Garg #qcs404 Signed-off-by: Caleb Connolly --- arch/arm/lib/save_prev_bl_data.c | 5 +++++ include/init.h | 11 +++++++++++ 2 files changed, 16 insertions(+) diff --git a/arch/arm/lib/save_prev_bl_data.c b/arch/arm/lib/save_prev_bl_data.c index f7b23faf0d..b286bac9bf 100644 --- a/arch/arm/lib/save_prev_bl_data.c +++ b/arch/arm/lib/save_prev_bl_data.c @@ -45,6 +45,11 @@ bool is_addr_accessible(phys_addr_t addr) return false; } +phys_addr_t get_prev_bl_fdt_addr(void) +{ + return reg0; +} + int save_prev_bl_data(void) { struct fdt_header *fdt_blob; diff --git a/include/init.h b/include/init.h index 9a1951d10a..630d86729c 100644 --- a/include/init.h +++ b/include/init.h @@ -168,6 +168,17 @@ defined(CONFIG_SAVE_PREV_BL_FDT_ADDR) * Return: 0 if ok; -ENODATA on error */ int save_prev_bl_data(void); + +/** + * get_prev_bl_fdt_addr - When u-boot is chainloaded, get the address + * of the FDT passed by the previous bootloader. + * + * Return: the address of the FDT passed by the previous bootloader + * or 0 if not found. + */ +phys_addr_t get_prev_bl_fdt_addr(void); +#else +#define get_prev_bl_fdt_addr() 0LLU #endif /** -- 2.39.5