diff options
author | Tom Rini <trini@ti.com> | 2015-02-16 19:55:50 (GMT) |
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committer | Tom Rini <trini@ti.com> | 2015-02-17 11:27:44 (GMT) |
commit | a851604ca36493e8319a7d3a17594b7224d546fe (patch) | |
tree | dff68fbdd1b098e334d0da031de250dc8852c3b9 /arch/arm/cpu/armv7/sunxi/board.c | |
parent | 0ce3f1f90ae6168805f20e473a9ed7fab5fb13a8 (diff) | |
parent | 840fe95c3bcff7692c51b90ebc0d350792597ff0 (diff) | |
download | u-boot-fsl-qoriq-a851604ca36493e8319a7d3a17594b7224d546fe.tar.xz |
Merge branch 'master' of http://git.denx.de/u-boot-sunxi
Diffstat (limited to 'arch/arm/cpu/armv7/sunxi/board.c')
-rw-r--r-- | arch/arm/cpu/armv7/sunxi/board.c | 46 |
1 files changed, 45 insertions, 1 deletions
diff --git a/arch/arm/cpu/armv7/sunxi/board.c b/arch/arm/cpu/armv7/sunxi/board.c index 6e28bcd..c02c015 100644 --- a/arch/arm/cpu/armv7/sunxi/board.c +++ b/arch/arm/cpu/armv7/sunxi/board.c @@ -27,6 +27,17 @@ #include <linux/compiler.h> +struct fel_stash { + uint32_t sp; + uint32_t lr; + uint32_t cpsr; + uint32_t sctlr; + uint32_t vbar; + uint32_t cr; +}; + +struct fel_stash fel_stash __attribute__((section(".data"))); + static int gpio_init(void) { #if CONFIG_CONS_INDEX == 1 && defined(CONFIG_UART0_PORT_F) @@ -65,6 +76,12 @@ static int gpio_init(void) return 0; } +void spl_board_load_image(void) +{ + debug("Returning to FEL sp=%x, lr=%x\n", fel_stash.sp, fel_stash.lr); + return_to_fel(fel_stash.sp, fel_stash.lr); +} + void s_init(void) { #if defined CONFIG_MACH_SUN6I || defined CONFIG_MACH_SUN8I @@ -95,7 +112,34 @@ void s_init(void) */ u32 spl_boot_device(void) { - return BOOT_DEVICE_MMC1; +#ifdef CONFIG_SPL_FEL + /* + * This is the legacy compile time configuration for a special FEL + * enabled build. It has many restrictions and can only boot over USB. + */ + return BOOT_DEVICE_BOARD; +#else + /* + * When booting from the SD card, the "eGON.BT0" signature is expected + * to be found in memory at the address 0x0004 (see the "mksunxiboot" + * tool, which generates this header). + * + * When booting in the FEL mode over USB, this signature is patched in + * memory and replaced with something else by the 'fel' tool. This other + * signature is selected in such a way, that it can't be present in a + * valid bootable SD card image (because the BROM would refuse to + * execute the SPL in this case). + * + * This branch is just making a decision at runtime whether to load + * the main u-boot binary from the SD card (if the "eGON.BT0" signature + * is found) or return to the FEL code in the BROM to wait and receive + * the main u-boot binary over USB. + */ + if (readl(4) == 0x4E4F4765 && readl(8) == 0x3054422E) /* eGON.BT0 */ + return BOOT_DEVICE_MMC1; + else + return BOOT_DEVICE_BOARD; +#endif } /* No confirmation data available in SPL yet. Hardcode bootmode */ |