The Boot ROM write some boot source ID (SD card, eMMC, SPI, ...) into a certain location in SRAM, so the SPL can easily determine where to load U-Boot proper from. Factor out reading this value, as it will come in handy again shortly.
Signed-off-by: Andre Przywara andre.przywara@arm.com --- arch/arm/mach-sunxi/board.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/arch/arm/mach-sunxi/board.c b/arch/arm/mach-sunxi/board.c index aa1d2230c9..9c0cf718b8 100644 --- a/arch/arm/mach-sunxi/board.c +++ b/arch/arm/mach-sunxi/board.c @@ -221,12 +221,22 @@ void s_init(void) eth_init_board(); }
+#define SUNXI_INVALID_BOOT_SOURCE -1 + +static int sunxi_get_boot_source(void) +{ + if (!is_boot0_magic(SPL_ADDR + 4)) /* eGON.BT0 */ + return SUNXI_INVALID_BOOT_SOURCE; + + return readb(SPL_ADDR + 0x28); +} + /* The sunxi internal brom will try to loader external bootloader * from mmc0, nand flash, mmc2. */ uint32_t sunxi_get_boot_device(void) { - int boot_source; + int boot_source = sunxi_get_boot_source();
/* * When booting from the SD card or NAND memory, the "eGON.BT0" @@ -244,11 +254,9 @@ uint32_t sunxi_get_boot_device(void) * binary over USB. If it is found, it determines where SPL was * read from. */ - if (!is_boot0_magic(SPL_ADDR + 4)) /* eGON.BT0 */ - return BOOT_DEVICE_BOARD; - - boot_source = readb(SPL_ADDR + 0x28); switch (boot_source) { + case SUNXI_INVALID_BOOT_SOURCE: + return BOOT_DEVICE_BOARD; case SUNXI_BOOTED_FROM_MMC0: case SUNXI_BOOTED_FROM_MMC0_HIGH: return BOOT_DEVICE_MMC1;