[PATCH 1/3] board: mediatek: fix mmc_get_boot_dev() for platforms without external SD

[David Woodhouse]

On the UniElec U7623 board there is no external SD slot and the preloader
doesn't fill in the magic field at 0x81dffff0 to indicate that it was
booted from eMMC.

Signed-off-by: David Woodhouse <dwmw2 at infradead.org>
---
 board/mediatek/mt7623/mt7623_rfb.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/board/mediatek/mt7623/mt7623_rfb.c b/board/mediatek/mt7623/mt7623_rfb.c
index 4ec2764976..984e75ccaf 100644
--- a/board/mediatek/mt7623/mt7623_rfb.c
+++ b/board/mediatek/mt7623/mt7623_rfb.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <mmc.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -15,10 +16,15 @@ int board_init(void)
 	return 0;
 }
 
+#ifdef CONFIG_MMC
 int mmc_get_boot_dev(void)
 {
 	int g_mmc_devid = -1;
 	char *uflag = (char *)0x81DFFFF0;
+
+	if (!find_mmc_device(1))
+		return 0;
+
 	if (strncmp(uflag,"eMMC",4)==0) {
 		g_mmc_devid = 0;
 		printf("Boot From Emmc(id:%d)\n\n", g_mmc_devid);
@@ -33,3 +39,4 @@ int mmc_get_env_dev(void)
 {
 	return mmc_get_boot_dev();
 }
+#endif
-- 
2.26.2