ARM: omap3: evm: Add kernel image loading from UBIFS and EXT4

This commit adds UBIFS_NAND to BOOT_TARGET_DEVICES. This will
allow the kernel zImage to be loaded from '/boot/zImage' in UBIFS
(ubi0:rootfs).

Additionally update the *_MMC devices to also load kernel image from
the MMC 0:2 EXT4 file system.

DISTRO_DEFAULTS Setup

=====================

[primary] Check MMC 0:1 for /extlinux/extlinux.conf and boot
[fallback 1] Check MMC 0:2 /boot/zImage and run mmcbootz
[fallback 2] Check MMC 0:2 /boot/uImage and run mmcboot
[fallback 3] Check NAND UBIFS /boot/zImage and run nandbootubifs
[fallback 4] Check NAND partitions and run nandboot

The following "extlinux.conf" can be used to load images in the
top-level of the MMC 0:1 FAT partition.

[MMC(0:1)/extlinux/extlinux.conf]
---8<-------------------------------------------------------------------
default omap3-evm
label omap3-evm
	kernel /zImage
	fdt /omap3-evm.dtb
	append console=ttyO0,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait
---8<-------------------------------------------------------------------

Signed-off-by: Derald D. Woods <woods.technical@gmail.com>

include/configs/omap3_evm.h

@@ -89,28 +89,35 @@
 #define MEM_LAYOUT_ENV_SETTINGS \
 	DEFAULT_LINUX_BOOT_ENV
 
-#if defined(CONFIG_NAND)
+#if defined(CONFIG_NAND) && defined(CONFIG_CMD_UBI)
+/* NAND boot with uImage from NAND 'kernel' partition */
 #define BOOTENV_DEV_NAND(devtypeu, devtypel, instance) \
 	"bootcmd_" #devtypel #instance "=" \
 	"run nandboot\0"
-
 #define BOOTENV_DEV_NAME_NAND(devtypeu, devtypel, instance) \
 	#devtypel #instance " "
-#endif /* CONFIG_NAND */
 
+/* NAND boot with zImage from UBIFS '/boot/zImage' */
+#define BOOTENV_DEV_UBIFS_NAND(devtypeu, devtypel, instance) \
+	"bootcmd_" #devtypel #instance "=" \
+	"run nandbootubifs\0"
+#define BOOTENV_DEV_NAME_UBIFS_NAND(devtypeu, devtypel, instance) \
+	#devtypel #instance " "
+#endif /* CONFIG_NAND && CONFIG_CMD_UBI */
+
+/* MMC boot with uImage from MMC 0:2 '/boot/uImage' */
 #define BOOTENV_DEV_UIMAGE_MMC(devtypeu, devtypel, instance) \
 	"bootcmd_" #devtypel #instance "=" \
 		"setenv mmcdev " #instance"; " \
 		"run mmcboot\0"
-
 #define BOOTENV_DEV_NAME_UIMAGE_MMC(devtypeu, devtypel, instance) \
 	#devtypel #instance " "
 
+/* MMC boot with zImage from MMC 0:2 '/boot/zImage' */
 #define BOOTENV_DEV_ZIMAGE_MMC(devtypeu, devtypel, instance) \
 	"bootcmd_" #devtypel #instance "=" \
 		"setenv mmcdev " #instance"; " \
 		"run mmcbootz\0"
-
 #define BOOTENV_DEV_NAME_ZIMAGE_MMC(devtypeu, devtypel, instance) \
 	#devtypel #instance " "
 
@@ -118,6 +125,7 @@
 	func(MMC, mmc, 0) \
 	func(ZIMAGE_MMC, zimage_mmc, 0) \
 	func(UIMAGE_MMC, uimage_mmc, 0) \
+	func(UBIFS_NAND, ubifs_nand, 0) \
 	func(NAND, nand, 0)
 
 #include <config_distro_bootcmd.h>
@@ -128,9 +136,11 @@
 	"mtdids=" CONFIG_MTDIDS_DEFAULT "\0" \
 	"mtdparts=" CONFIG_MTDPARTS_DEFAULT "\0" \
 	"fdt_high=0xffffffff\0" \
+	"bootdir=/boot\0" \
 	"bootenv=uEnv.txt\0" \
 	"optargs=\0" \
 	"mmcdev=0\0" \
+	"mmcpart=2\0" \
 	"console=ttyO0,115200n8\0" \
 	"mmcargs=setenv bootargs console=${console} " \
 		"${mtdparts} " \
@@ -143,39 +153,52 @@
 		"root=ubi0:rootfs rw ubi.mtd=rootfs noinitrd " \
 		"rootfstype=ubifs rootwait\0" \
 	"loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenv}\0" \
+	"ext4bootenv=ext4load mmc ${mmcdev}:${mmcpart} ${loadaddr} ${bootdir}/${bootenv}\0" \
 	"importbootenv=echo Importing environment from mmc ...; " \
 		"env import -t ${loadaddr} ${filesize}\0" \
-	"mmcbootenv=" \
-		"mmc dev ${mmcdev}; " \
-		"if mmc rescan && run loadbootenv; then " \
-			"run importbootenv; " \
+	"mmcbootenv=mmc dev ${mmcdev}; " \
+		"if mmc rescan; then " \
+			"run loadbootenv && run importbootenv; " \
+			"run ext4bootenv && run importbootenv; " \
 			"if test -n $uenvcmd; then " \
 				"echo Running uenvcmd ...; " \
 				"run uenvcmd; " \
 			"fi; " \
 		"fi\0" \
 	"loaduimage=setenv bootfile uImage; " \
-		"fatload mmc ${mmcdev} ${loadaddr} uImage\0" \
+		"ext4load mmc ${mmcdev}:${mmcpart} ${loadaddr} ${bootdir}/${bootfile}\0" \
 	"loadzimage=setenv bootfile zImage; " \
-		"fatload mmc ${mmcdev} ${loadaddr} zImage\0" \
-	"loaddtb=fatload mmc ${mmcdev} ${fdtaddr} ${fdtfile}\0" \
+		"ext4load mmc ${mmcdev}:${mmcpart} ${loadaddr} ${bootdir}/${bootfile}\0" \
+	"loaddtb=ext4load mmc ${mmcdev}:${mmcpart} ${fdtaddr} ${bootdir}/${fdtfile}\0" \
+	"loadubizimage=setenv bootfile zImage; " \
+		"ubifsload ${loadaddr} ${bootdir}/${bootfile}\0" \
+	"loadubidtb=ubifsload ${fdtaddr} ${bootdir}/${fdtfile}\0" \
 	"mmcboot=run mmcbootenv; " \
 		"if run loaduimage && run loaddtb; then " \
-			"echo Booting ${bootfile} from mmc ...; " \
+			"echo Booting ${bootdir}/${bootfile} from mmc ${mmcdev}:${mmcpart} ...; " \
 			"run mmcargs; " \
 			"bootm ${loadaddr} - ${fdtaddr}; " \
 		"fi\0" \
 	"mmcbootz=run mmcbootenv; " \
 		"if run loadzimage && run loaddtb; then " \
-			"echo Booting ${bootfile} from mmc ...; " \
+			"echo Booting ${bootdir}/${bootfile} from mmc ${mmcdev}:${mmcpart} ...; " \
 			"run mmcargs; " \
-			"bootz ${loadaddr} - ${fdtaddr};" \
+			"bootz ${loadaddr} - ${fdtaddr}; " \
 		"fi\0" \
-	"nandboot=echo Booting uImage from nand ...; " \
-		"run nandargs; " \
+	"nandboot=" \
 		"nand read ${loadaddr} kernel; " \
 		"nand read ${fdtaddr} dtb; " \
+		"echo Booting uImage from NAND MTD 'kernel' partition ...; " \
+		"run nandargs; " \
 		"bootm ${loadaddr} - ${fdtaddr}\0" \
+	"nandbootubifs=" \
+		"ubi part rootfs; " \
+		"ubifsmount ubi0:rootfs; " \
+		"if run loadubizimage && run loadubidtb; then " \
+			"echo Booting ${bootdir}/${bootfile} from NAND ubi0:rootfs ...; " \
+			"run nandargs; " \
+			"bootz ${loadaddr} - ${fdtaddr}; " \
+		"fi\0" \
 	BOOTENV
 
 #endif /* __CONFIG_H */