From: Fabio Estevam <fabio.estevam@nxp.com>
Date: Mon, 10 Jul 2017 18:59:12 +0000 (-0300)
Subject: mx6sabre: Use PARTUUID to specify the rootfs location
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=00f43e51c5e77c3333784830305a2bbd4d55d2c0;p=u-boot.git

mx6sabre: Use PARTUUID to specify the rootfs location

mx6sabre boards 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 eMMC
changes depending on the kernel version.

In order to avoid such issue, use UUID method to specify the rootfs
location.

Succesfully tested booting a NXP 4.1 and also a mainline kernel on a
mx6qsabresd and mx6dlsabreauto.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
---

diff --git a/configs/mx6sabreauto_defconfig b/configs/mx6sabreauto_defconfig
index f904cbfe8d..236af953b5 100644
--- a/configs/mx6sabreauto_defconfig
+++ b/configs/mx6sabreauto_defconfig
@@ -22,6 +22,7 @@ CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_MMC=y
+CONFIG_CMD_PART=y
 CONFIG_CMD_SF=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_USB=y
diff --git a/configs/mx6sabresd_defconfig b/configs/mx6sabresd_defconfig
index 972e971a6a..d8e05cfe04 100644
--- a/configs/mx6sabresd_defconfig
+++ b/configs/mx6sabresd_defconfig
@@ -23,6 +23,7 @@ CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_MMC=y
+CONFIG_CMD_PART=y
 CONFIG_CMD_SF=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_USB=y
diff --git a/include/configs/mx6sabre_common.h b/include/configs/mx6sabre_common.h
index 9b0fe5a3c2..d4e4628841 100644
--- a/include/configs/mx6sabre_common.h
+++ b/include/configs/mx6sabre_common.h
@@ -77,7 +77,7 @@
 	"initrd_high=0xffffffff\0" \
 	"mmcdev=" __stringify(CONFIG_SYS_MMC_ENV_DEV) "\0" \
 	"mmcpart=1\0" \
-	"mmcroot=" CONFIG_MMCROOT " rootwait rw\0" \
+	"finduuid=part uuid mmc ${mmcdev}:2 uuid\0" \
 	"update_sd_firmware=" \
 		"if test ${ip_dyn} = yes; then " \
 			"setenv get_cmd dhcp; " \
@@ -93,7 +93,7 @@
 		"fi\0" \
 	EMMC_ENV	  \
 	"mmcargs=setenv bootargs console=${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 ...; " \
@@ -101,6 +101,7 @@
 	"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 " \
diff --git a/include/configs/mx6sabreauto.h b/include/configs/mx6sabreauto.h
index 2c08fd1baa..1883eb0ba6 100644
--- a/include/configs/mx6sabreauto.h
+++ b/include/configs/mx6sabreauto.h
@@ -16,7 +16,6 @@
 #define CONFIG_MACH_TYPE	3529
 #define CONFIG_MXC_UART_BASE	UART4_BASE
 #define CONSOLE_DEV		"ttymxc3"
-#define CONFIG_MMCROOT			"/dev/mmcblk0p2"
 
 /* USB Configs */
 #define CONFIG_USB_HOST_ETHER
diff --git a/include/configs/mx6sabresd.h b/include/configs/mx6sabresd.h
index 3eba70a5a4..27e767241f 100644
--- a/include/configs/mx6sabresd.h
+++ b/include/configs/mx6sabresd.h
@@ -16,7 +16,6 @@
 #define CONFIG_MACH_TYPE	3980
 #define CONFIG_MXC_UART_BASE	UART1_BASE
 #define CONSOLE_DEV		"ttymxc0"
-#define CONFIG_MMCROOT			"/dev/mmcblk1p2"
 
 #define CONFIG_SUPPORT_EMMC_BOOT /* eMMC specific */