OMAP3: igep00x0: allow booting with a FDT from MMC

IGEP boards now have Device Tree support in the mainline
kernel. To boot an IGEP board using a DT, a uEnv.txt plain
text file could be used to define a custom uenvcmd that will
be run by the default boot command.

It is more convenient to change the default boot command to
allow loading a FDT if it is stored in the boot dir of the
rootfs uSD/MMC partition.

If no FDT is found then the defaul command tries to boot a
zImage without a DT using legacy boot.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>

board/isee/igep00x0/igep00x0.c

@@ -138,6 +138,18 @@ int board_mmc_init(bd_t *bis)
 }
 #endif
 
+void set_fdt(void)
+{
+	switch (gd->bd->bi_arch_number) {
+	case MACH_TYPE_IGEP0020:
+		setenv("dtbfile", "omap3-igep0020.dtb");
+		break;
+	case MACH_TYPE_IGEP0030:
+		setenv("dtbfile", "omap3-igep0030.dtb");
+		break;
+	}
+}
+
 /*
  * Routine: misc_init_r
  * Description: Configure board specific parts
@@ -150,6 +162,8 @@ int misc_init_r(void)
 
 	dieid_num_r();
 
+	set_fdt();
+
 	return 0;
 }
 

include/configs/igep00x0.h

@@ -138,6 +138,9 @@
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	"usbtty=cdc_acm\0" \
 	"loadaddr=0x82000000\0" \
+	"dtbaddr=0x81600000\0" \
+	"bootdir=/boot\0" \
+	"bootfile=zImage\0" \
 	"usbtty=cdc_acm\0" \
 	"console=ttyO2,115200n8\0" \
 	"mpurate=auto\0" \
@@ -168,10 +171,13 @@
 	"loadbootenv=load mmc ${mmcdev} ${loadaddr} uEnv.txt\0" \
 	"importbootenv=echo Importing environment from mmc ...; " \
 		"env import -t $loadaddr $filesize\0" \
-	"loadzimage=load mmc ${mmcdev} ${loadaddr} zImage\0" \
+	"loadzimage=load mmc ${mmcdev}:2 ${loadaddr} ${bootdir}/${bootfile}\0" \
+	"loadfdt=load mmc ${mmcdev}:2 ${dtbaddr} ${bootdir}/${dtbfile}\0" \
 	"mmcboot=echo Booting from mmc ...; " \
 		"run mmcargs; " \
 		"bootz ${loadaddr}\0" \
+	"mmcbootfdt=echo Booting with DT from mmc ...; " \
+		"bootz ${loadaddr} - ${dtbaddr}\0" \
 	"nandboot=echo Booting from onenand ...; " \
 		"run nandargs; " \
 		"onenand read ${loadaddr} 280000 400000; " \
@@ -188,6 +194,11 @@
 			"run uenvcmd;" \
 		"fi;" \
 		"if run loadzimage; then " \
+			"if test -n $dtbfile; then " \
+				"if run loadfdt; then " \
+					"run mmcbootfdt;" \
+				"fi;" \
+			"fi;" \
 			"run mmcboot;" \
 		"fi;" \
 	"fi;" \