warp7: select uuid partition based on rootpart

Assigning the UUID discovery path to a tweakable environment variable means
that later steps in the boot process - particularly a boot script can
change the target root partition of a particular Linux boot.

Retargeting the rootfs is an important feature when doing ping/pong
upgrades allowing a boot script to select ping or pong as necessary without
reprogramming the bootloader.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Tested-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>

diff --git a/include/configs/warp7.h b/include/configs/warp7.h
index 344042c..54b3b31 100644 (file)
--- a/include/configs/warp7.h
+++ b/include/configs/warp7.h
@@ -45,7 +45,8 @@
        "ip_dyn=yes\0" \
        "mmcdev="__stringify(CONFIG_SYS_MMC_ENV_DEV)"\0" \
        "mmcpart=" __stringify(CONFIG_SYS_MMC_IMG_LOAD_PART) "\0" \
-       "finduuid=part uuid mmc 0:2 uuid\0" \
+       "rootpart=" __stringify(CONFIG_WARP7_ROOT_PART) "\0" \
+       "finduuid=part uuid mmc 0:${rootpart} uuid\0" \
        "mmcargs=setenv bootargs console=${console},${baudrate} " \
                "root=PARTUUID=${uuid} rootwait rw\0" \
        "loadbootscript=" \