diff options
| -rw-r--r-- | board/armltd/vexpress64/lowlevel_init.S | 2 | ||||
| -rw-r--r-- | board/armltd/vexpress64/vexpress64.c | 27 |
2 files changed, 24 insertions, 5 deletions
diff --git a/board/armltd/vexpress64/lowlevel_init.S b/board/armltd/vexpress64/lowlevel_init.S index 3dcfb85d0e9..68ca3f26e96 100644 --- a/board/armltd/vexpress64/lowlevel_init.S +++ b/board/armltd/vexpress64/lowlevel_init.S @@ -7,6 +7,6 @@ save_boot_params: adr x8, prior_stage_fdt_address - str x0, [x8] + stp x0, x1, [x8] b save_boot_params_ret diff --git a/board/armltd/vexpress64/vexpress64.c b/board/armltd/vexpress64/vexpress64.c index 05a7a25c32e..af326dc6f45 100644 --- a/board/armltd/vexpress64/vexpress64.c +++ b/board/armltd/vexpress64/vexpress64.c @@ -100,7 +100,7 @@ int dram_init_banksize(void) * Push the variable into the .data section so that it * does not get cleared later. */ -unsigned long __section(".data") prior_stage_fdt_address; +unsigned long __section(".data") prior_stage_fdt_address[2]; #ifdef CONFIG_OF_BOARD @@ -151,6 +151,23 @@ static phys_addr_t find_dtb_in_nor_flash(const char *partname) } #endif +/* + * Filter for a valid DTB, as TF-A happens to provide a pointer to some + * data structure using the DTB format, which we cannot use. + * The address of the DTB cannot be 0, in fact this is the reserved value + * for x1 in the kernel boot protocol. + * And while the nt_fw_config.dtb used by TF-A is a valid DTB structure, it + * does not contain the typical nodes and properties, which we test for by + * probing for the mandatory /memory node. + */ +static bool is_valid_dtb(uintptr_t dtb_ptr) +{ + if (dtb_ptr == 0 || fdt_magic(dtb_ptr) != FDT_MAGIC) + return false; + + return fdt_subnode_offset((void *)dtb_ptr, 0, "memory") >= 0; +} + void *board_fdt_blob_setup(int *err) { #ifdef CONFIG_TARGET_VEXPRESS64_JUNO @@ -172,10 +189,12 @@ void *board_fdt_blob_setup(int *err) } #endif - if (fdt_magic(prior_stage_fdt_address) == FDT_MAGIC && - fdt_totalsize(prior_stage_fdt_address) > 0x100) { + if (is_valid_dtb(prior_stage_fdt_address[1])) { + *err = 0; + return (void *)prior_stage_fdt_address[1]; + } else if (is_valid_dtb(prior_stage_fdt_address[0])) { *err = 0; - return (void *)prior_stage_fdt_address; + return (void *)prior_stage_fdt_address[0]; } if (fdt_magic(gd->fdt_blob) == FDT_MAGIC) { |