[U-Boot] [PATCH] arm: mvebu: fix boot from UART when in fallback mode

[Sean Nyekjaer]

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

Signed-off-by: Sean Nyekjaer <sean.nyekjaer at prevas.dk>
---
 arch/arm/mach-mvebu/include/mach/soc.h | 6 ++++++
 arch/arm/mach-mvebu/spl.c              | 9 +++++++++
 2 files changed, 15 insertions(+)

diff --git a/arch/arm/mach-mvebu/include/mach/soc.h b/arch/arm/mach-mvebu/include/mach/soc.h
index 1d302761f0..4f81285bb5 100644
--- a/arch/arm/mach-mvebu/include/mach/soc.h
+++ b/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 */
diff --git a/arch/arm/mach-mvebu/spl.c b/arch/arm/mach-mvebu/spl.c
index a72a769f7c..2fd6c62589 100644
--- a/arch/arm/mach-mvebu/spl.c
+++ b/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;
 
 	/*
-- 
2.15.0