Rockchip BROM write a boot source id at CFG_IRAM_BASE + 0x10, the id indicate from what storage media TPL/SPL was loaded from.
SPL use this value to determine what device "same-as-spl" represent when determining from where FIT should be loaded. This works as long as the boot_devices array contain a matching id <-> node path entry.
However, SPL typically load a small part of TF-A into SRAM and on RK3399 this overwrites the CFG_IRAM_BASE + 0x10 addr used for boot source id.
Here boot source id is 3 before FIT images is loaded, and 0 after:
U-Boot SPL 2024.04-rc4 (Mar 15 2024 - 17:26:19 +0000) board_spl_was_booted_from: brom_bootdevice_id 3 maps to '/spi@ff1d0000/flash@0' Trying to boot from SPI ## Checking hash(es) for config config-1 ... OK ## Checking hash(es) for Image atf-1 ... sha256+ OK ## Checking hash(es) for Image u-boot ... sha256+ OK ## Checking hash(es) for Image fdt-1 ... sha256+ OK ## Checking hash(es) for Image atf-2 ... sha256+ OK ## Checking hash(es) for Image atf-3 ... sha256+ OK board_spl_was_booted_from: failed to resolve brom_bootdevice_id 0 spl_decode_boot_device: could not find udevice for /mmc@fe330000 spl_decode_boot_device: could not find udevice for /mmc@fe320000 spl_perform_fixups: could not map boot_device to ofpath: -19
Use a static bootdevice_brom_id to cache the boot source id after an initial read from SRAM to fix this, this allow spl_perform_fixups() to resolve correct boot source path for "same-as-spl" after SPL have loaded TF-A related FIT images into memory.
With this the spl-boot-device prop can correctly be resolved to the SPI flash node in the control FDT:
=> fdt addr ${fdtcontroladdr} Working FDT set to f1ee6710 => fdt list /chosen chosen { u-boot,spl-boot-device = "/spi@ff1d0000/flash@0"; stdout-path = "serial2:1500000n8"; u-boot,spl-boot-order = "same-as-spl", "/mmc@fe330000", "/mmc@fe320000"; };
Signed-off-by: Jonas Karlman jonas@kwiboo.se --- arch/arm/mach-rockchip/spl.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-rockchip/spl.c b/arch/arm/mach-rockchip/spl.c index 1586a093fc37..27e996b504e7 100644 --- a/arch/arm/mach-rockchip/spl.c +++ b/arch/arm/mach-rockchip/spl.c @@ -32,9 +32,17 @@ __weak const char * const boot_devices[BROM_LAST_BOOTSOURCE + 1] = {
const char *board_spl_was_booted_from(void) { - u32 bootdevice_brom_id = readl(BROM_BOOTSOURCE_ID_ADDR); + static u32 bootdevice_brom_id; const char *bootdevice_ofpath = NULL;
+ if (!bootdevice_brom_id) + bootdevice_brom_id = readl(BROM_BOOTSOURCE_ID_ADDR); + if (!bootdevice_brom_id) { + debug("%s: unknown brom_bootdevice_id %x\n", + __func__, bootdevice_brom_id); + return NULL; + } + if (bootdevice_brom_id < ARRAY_SIZE(boot_devices)) bootdevice_ofpath = boot_devices[bootdevice_brom_id];