Enabling SD-card booting on the VIA Springboard u-boot

uboot-sdcard.patch

--- bspinst/bspinst.cfg	2013-09-04 18:45:54.000000000 +0800
+++ bspinst/bspinst.cfg	2014-06-17 16:18:27.000000000 +0800
@@ -192,6 +192,13 @@
     ${bootargs-common} \
     ${bootargs-extra}
 
+# Set rootfs on the SD card
+setenv set-rfs-sd \
+  setenv bootargs mem=${memtotal} root=/dev/mmcblk0p2 rw \
+  rootfstype=ext4 noinitrd mbtotal=${mbsize} \
+  ${bootargs-common} \
+  ${bootargs-extra}
+
 setenv boot-mmc-ram \
   mmcinit ${mmcid}\; \
   fatload mmc ${mmcid}:1 ${cfg.load-addr-kernel} bspinst/uzImage.bin\; \
@@ -262,6 +269,15 @@
     bootm ${cfg.load-addr-kernel}\; \
   fi
 
+# Try to boot from the SD card
+setenv boot-sd \
+  mmcinit ${mmcid}\; \
+  fatload mmc ${mmcid} ${cfg.load-addr-kernel} uzimage.bin\; \
+  if iminfo ${cfg.load-addr-kernel}\; then \
+    run set-rfs-sd\; \
+    bootm ${cfg.load-addr-kernel}\; \
+  fi
+
 setenv boot-sf-nand \
   if iminfo 0xffd00000\; then \
     run set-rfs-nand\; \
@@ -289,6 +305,7 @@
 setenv pre-boot \
   run scriptcmd\; \
   run scriptcmd-usb\; \
+  run boot-sd\; \
   run boot-mmc-ram\; \
   echo No MMC card found\; \
   run boot-usb-ram\; \