On Fri, 16 Feb 2024 at 02:22, Caleb Connolly caleb.connolly@linaro.org wrote:
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 trini@konsulko.com Signed-off-by: Caleb Connolly caleb.connolly@linaro.org
arch/arm/lib/save_prev_bl_data.c | 5 +++++ include/init.h | 11 +++++++++++ 2 files changed, 16 insertions(+)
Reviewed-by: Sumit Garg sumit.garg@linaro.org
-Sumit
diff --git a/arch/arm/lib/save_prev_bl_data.c b/arch/arm/lib/save_prev_bl_data.c index f7b23faf0d66..b286bac9bf00 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 9a1951d10a01..630d86729c4e 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
/**
-- 2.43.1