[U-Boot] [PATCH v2 2/6] pico-imx6ul: Use PARTUUID to specify the rootfs location

Otavio Salvador
2017-11-16T11:59:45Z

Currently the rootfs location is passed via mmcblk number and using
the UUID method to specify the rootfs location is a better approach
working even if mmcblk number for the eMMC changes depending on the
kernel versions.

Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
---

Changes in v2:
- fix typo (s/eMMM/eMMC/) - Fabio Estevam

configs/pico-imx6ul_defconfig | 1 +
include/configs/pico-imx6ul.h | 6 +++---
2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/configs/pico-imx6ul_defconfig b/configs/pico-imx6ul_defconfig
index 09b36ccb09..e00f9f34a3 100644
--- a/configs/pico-imx6ul_defconfig
+++ b/configs/pico-imx6ul_defconfig
@@ -13,6 +13,7 @@ CONFIG_CMD_DFU=y
# CONFIG_CMD_FLASH is not set
CONFIG_CMD_GPIO=y
CONFIG_CMD_MMC=y
+CONFIG_CMD_PART=y
CONFIG_CMD_USB=y
CONFIG_CMD_USB_MASS_STORAGE=y
CONFIG_CMD_DHCP=y
diff --git a/include/configs/pico-imx6ul.h b/include/configs/pico-imx6ul.h
index d4b29e3950..c775c32690 100644
--- a/include/configs/pico-imx6ul.h
+++ b/include/configs/pico-imx6ul.h
@@ -61,14 +61,15 @@
"fdt_addr=0x83000000\0" \
"mmcdev="__stringify(CONFIG_SYS_MMC_ENV_DEV)"\0" \
"mmcpart=" __stringify(CONFIG_SYS_MMC_IMG_LOAD_PART) "\0" \
- "mmcroot=" CONFIG_MMCROOT " rootwait rw\0" \
"mmcautodetect=yes\0" \
CONFIG_DFU_ENV_SETTINGS \
+ "finduuid=part uuid mmc 0:2 uuid\0" \
"mmcargs=setenv bootargs console=${console},${baudrate} " \
- "root=${mmcroot}\0" \
+ "root=PARTUUID=${uuid} rootwait rw\0" \
"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 run loadfdt; then " \
"bootz ${loadaddr} - ${fdt_addr}; " \
@@ -147,6 +148,5 @@

#define CONFIG_SYS_MMC_ENV_DEV 0
#define CONFIG_SYS_MMC_ENV_PART 0
-#define CONFIG_MMCROOT "/dev/mmcblk0p2"

#endif /* __PICO_IMX6UL_CONFIG_H */
--
2.15.0