[U-Boot] [PATCH 3/3] mx6sxsabresd: Use PARTUUID to specify the rootfs location

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam at nxp.com>

mx6sxsabresd can run different kernel versions, such as NXP 4.1 or mainline.
    
Currently the rootfs location is passed via mmcblk number and the
problem with this approach is that the mmcblk number for the SD
card changes depending on the kernel version.
    
In order to avoid such issue, use the UUID method to specify the
rootfs location.

Signed-off-by: Fabio Estevam <fabio.estevam at nxp.com>
---
 configs/mx6sxsabresd_defconfig | 1 +
 include/configs/mx6sxsabresd.h | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/configs/mx6sxsabresd_defconfig b/configs/mx6sxsabresd_defconfig
index ac36a18..b707322 100644
--- a/configs/mx6sxsabresd_defconfig
+++ b/configs/mx6sxsabresd_defconfig
@@ -12,6 +12,7 @@ CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
+CONFIG_CMD_PART=y
 CONFIG_CMD_PCI=y
 CONFIG_CMD_USB=y
 # CONFIG_CMD_SETEXPR is not set
diff --git a/include/configs/mx6sxsabresd.h b/include/configs/mx6sxsabresd.h
index 85b8601..906e677 100644
--- a/include/configs/mx6sxsabresd.h
+++ b/include/configs/mx6sxsabresd.h
@@ -58,9 +58,9 @@
 	"videomode=video=ctfb:x:800,y:480,depth:24,pclk:29850,le:89,ri:164,up:23,lo:10,hs:10,vs:10,sync:0,vmode:0\0" \
 	"mmcdev=2\0" \
 	"mmcpart=1\0" \
-	"mmcroot=/dev/mmcblk0p2 rootwait rw\0" \
+	"finduuid=part uuid mmc 2:2 uuid\0" \
 	"mmcargs=setenv bootargs console=${console},${baudrate} " \
-		"root=${mmcroot}\0" \
+		"root=PARTUUID=${uuid} rootwait rw\0" \
 	"loadbootscript=" \
 		"fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};\0" \
 	"bootscript=echo Running bootscript from mmc ...; " \
@@ -68,6 +68,7 @@
 	"loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}\0" \
 	"loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}\0" \
 	"mmcboot=echo Booting from mmc ...; " \
+		"run finduuid; " \
 		"run mmcargs; " \
 		"if test ${boot_fdt} = yes || test ${boot_fdt} = try; then " \
 			"if run loadfdt; then " \
-- 
2.7.4