arm: mvebu: fix boot from UART when in fallback mode

It's the first 8 bits of the bootrom error register that
contain the boot error/fallback error code. Let's check that
and continue to boot from UART.

Signed-off-by: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
Signed-off-by: Stefan Roese <sr@denx.de>

arch/arm/mach-mvebu/include/mach/soc.h

@@ -111,10 +111,16 @@
 #define COMPHY_REFCLK_ALIGNMENT	(MVEBU_REGISTER(0x182f8))
 
 /* BootROM error register (also includes some status infos) */
+#if defined(CONFIG_ARMADA_38X)
+#define CONFIG_BOOTROM_ERR_REG	(MVEBU_REGISTER(0x182d0))
+#define BOOTROM_ERR_MODE_OFFS	0
+#define BOOTROM_ERR_MODE_MASK	(0xf << BOOTROM_ERR_MODE_OFFS)
+#else
 #define CONFIG_BOOTROM_ERR_REG	(MVEBU_REGISTER(0x182d0))
 #define BOOTROM_ERR_MODE_OFFS	28
 #define BOOTROM_ERR_MODE_MASK	(0xf << BOOTROM_ERR_MODE_OFFS)
 #define BOOTROM_ERR_MODE_UART	0x6
+#endif
 
 #if defined(CONFIG_ARMADA_375)
 /* SAR values for Armada 375 */

arch/arm/mach-mvebu/spl.c

@@ -26,7 +26,16 @@ static u32 get_boot_device(void)
 	val = readl(CONFIG_BOOTROM_ERR_REG);
 	boot_device = (val & BOOTROM_ERR_MODE_MASK) >> BOOTROM_ERR_MODE_OFFS;
 	debug("BOOTROM_REG=0x%08x boot_device=0x%x\n", val, boot_device);
+#if defined(CONFIG_ARMADA_38X)
+	/*
+	 * If the bootrom error register contains any else than zeros
+	 * in the first 8 bits it's an error condition. And in that case
+	 * try to boot from UART.
+	 */
+	if (boot_device)
+#else
 	if (boot_device == BOOTROM_ERR_MODE_UART)
+#endif
 		return BOOT_DEVICE_UART;
 
 	/*