From: Quentin Schulz quentin.schulz@theobroma-systems.com
It is possible to boot U-Boot proper from a different storage medium than the one used by the BOOTROM to load the SPL. This information is stored in the u-boot,spl-boot-device Device Tree property and is accessible from U-Boot proper so that it has knowledge at runtime where it was loaded from.
Let's add support for this feature for px30.
Cc: Quentin Schulz foss+uboot@0leil.net Signed-off-by: Quentin Schulz quentin.schulz@theobroma-systems.com --- arch/arm/mach-rockchip/px30/px30.c | 50 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+)
diff --git a/arch/arm/mach-rockchip/px30/px30.c b/arch/arm/mach-rockchip/px30/px30.c index 481b50235e..5f26128d01 100644 --- a/arch/arm/mach-rockchip/px30/px30.c +++ b/arch/arm/mach-rockchip/px30/px30.c @@ -6,6 +6,7 @@ #include <clk.h> #include <dm.h> #include <init.h> +#include <spl.h> #include <asm/armv8/mmu.h> #include <asm/io.h> #include <asm/arch-rockchip/bootrom.h> @@ -427,3 +428,52 @@ void board_debug_uart_init(void) #endif /* CONFIG_DEBUG_UART_BASE && CONFIG_DEBUG_UART_BASE == ... */ } #endif /* CONFIG_DEBUG_UART_BOARD_INIT */ + +#if defined(CONFIG_SPL_BUILD) && !defined(CONFIG_TPL_BUILD) +const char *spl_decode_boot_device(u32 boot_device) +{ + int i; + static const struct { + u32 boot_device; + const char *ofpath; + } spl_boot_devices_tbl[] = { + { BOOT_DEVICE_MMC2, "/mmc@ff370000" }, + { BOOT_DEVICE_MMC1, "/mmc@ff390000" }, + }; + + for (i = 0; i < ARRAY_SIZE(spl_boot_devices_tbl); ++i) + if (spl_boot_devices_tbl[i].boot_device == boot_device) + return spl_boot_devices_tbl[i].ofpath; + + return NULL; +} + +void spl_perform_fixups(struct spl_image_info *spl_image) +{ + void *blob = spl_image->fdt_addr; + const char *boot_ofpath; + int chosen; + + /* + * Inject the ofpath of the device the full U-Boot (or Linux in + * Falcon-mode) was booted from into the FDT, if a FDT has been + * loaded at the same time. + */ + if (!blob) + return; + + boot_ofpath = spl_decode_boot_device(spl_image->boot_device); + if (!boot_ofpath) { + pr_err("%s: could not map boot_device to ofpath\n", __func__); + return; + } + + chosen = fdt_find_or_add_subnode(blob, 0, "chosen"); + if (chosen < 0) { + pr_err("%s: could not find/create '/chosen'\n", __func__); + return; + } + fdt_setprop_string(blob, chosen, + "u-boot,spl-boot-device", boot_ofpath); +} +#endif