sunxi: Use BROM stored boot_media value to determine our boot-source

Now that we know that the BROM stores a value indicating the boot-source
at the beginning of SRAM, use that instead of trying to recreate the
BROM's boot probing.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

arch/arm/include/asm/arch-sunxi/mmc.h

@@ -127,5 +127,4 @@ struct sunxi_mmc {
 #define SUNXI_MMC_COMMON_RESET			(1 << 18)
 
 struct mmc *sunxi_mmc_init(int sdc_no);
-int sunxi_mmc_has_egon_boot_signature(struct mmc *mmc);
 #endif /* _SUNXI_MMC_H */

arch/arm/mach-sunxi/board.c

@@ -203,7 +203,8 @@ DECLARE_GLOBAL_DATA_PTR;
  */
 u32 spl_boot_device(void)
 {
-	__maybe_unused struct mmc *mmc0, *mmc1;
+	int boot_source;
+
 	/*
 	 * When booting from the SD card or NAND memory, the "eGON.BT0"
 	 * signature is expected to be found in memory at the address 0x0004
@@ -223,32 +224,19 @@ u32 spl_boot_device(void)
 	if (!is_boot0_magic(SPL_ADDR + 4)) /* eGON.BT0 */
 		return BOOT_DEVICE_BOARD;
 
-#ifdef CONFIG_SPL_SPI_SUNXI
-	if (readb(SPL_ADDR + 0x28) == SUNXI_BOOTED_FROM_SPI)
-		return BOOT_DEVICE_SPI;
-#endif
-
-	/* The BROM will try to boot from mmc0 first, so try that first. */
-#ifdef CONFIG_MMC
-	mmc_initialize(gd->bd);
-	mmc0 = find_mmc_device(0);
-	if (sunxi_mmc_has_egon_boot_signature(mmc0))
+	boot_source = readb(SPL_ADDR + 0x28);
+	switch (boot_source) {
+	case SUNXI_BOOTED_FROM_MMC0:
 		return BOOT_DEVICE_MMC1;
-#endif
-
-	/* Fallback to booting NAND if enabled. */
-	if (IS_ENABLED(CONFIG_SPL_NAND_SUPPORT))
+	case SUNXI_BOOTED_FROM_NAND:
 		return BOOT_DEVICE_NAND;
-
-#ifdef CONFIG_MMC
-	if (CONFIG_MMC_SUNXI_SLOT_EXTRA == 2) {
-		mmc1 = find_mmc_device(1);
-		if (sunxi_mmc_has_egon_boot_signature(mmc1))
-			return BOOT_DEVICE_MMC2;
+	case SUNXI_BOOTED_FROM_MMC2:
+		return BOOT_DEVICE_MMC2;
+	case SUNXI_BOOTED_FROM_SPI:
+		return BOOT_DEVICE_SPI;
 	}
-#endif
 
-	panic("Could not determine boot source\n");
+	panic("Unknown boot source %d\n", boot_source);
 	return -1;		/* Never reached */
 }
 

board/sunxi/board.c

@@ -369,8 +369,7 @@ int board_mmc_init(bd_t *bis)
 	 * are searched there first. Note we only do this for u-boot proper,
 	 * not for the SPL, see spl_boot_device().
 	 */
-	if (!sunxi_mmc_has_egon_boot_signature(mmc0) &&
-	    sunxi_mmc_has_egon_boot_signature(mmc1)) {
+	if (readb(SPL_ADDR + 0x28) == SUNXI_BOOTED_FROM_MMC2) {
 		/* Booting from emmc / mmc2, swap */
 		mmc0->block_dev.devnum = 1;
 		mmc1->block_dev.devnum = 0;

drivers/mmc/sunxi_mmc.c

@@ -445,23 +445,6 @@ static int sunxi_mmc_getcd(struct mmc *mmc)
 	return !gpio_get_value(cd_pin);
 }
 
-int sunxi_mmc_has_egon_boot_signature(struct mmc *mmc)
-{
-	char *buf = malloc(512);
-	int valid_signature = 0;
-
-	if (buf == NULL)
-		panic("Failed to allocate memory\n");
-
-	if (mmc_getcd(mmc) && mmc_init(mmc) == 0 &&
-	    mmc->block_dev.block_read(&mmc->block_dev, 16, 1, buf) == 1 &&
-	    strncmp(&buf[4], "eGON.BT0", 8) == 0)
-		valid_signature = 1;
-
-	free(buf);
-	return valid_signature;
-}
-
 static const struct mmc_ops sunxi_mmc_ops = {
 	.send_cmd	= sunxi_mmc_send_cmd,
 	.set_ios	= sunxi_mmc_set_ios,