board: mediatek: fix mmc_get_boot_dev() for platforms without external SD

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@infradead.org>

diff --git a/board/mediatek/mt7623/mt7623_rfb.c b/board/mediatek/mt7623/mt7623_rfb.c
index 4ec2764..984e75c 100644 (file)
--- 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