[U-Boot] [PATCH v2] omap3_beagle: enable the use of a plain text file named uEnv.txt instead of boot.scr

[Jason Kridner]

From: Alexander Holler <holler at ahsoftware.de>

Using the new env import command it is possible to use plain text files instead
of script-images. Plain text files are much easier to handle.

E.g. If your boot.scr contains the following:
-----------------------------------
setenv dvimode 1024x768-16 at 60
run loaduimage
run mmcboot
-----------------------------------
you could create a file named uEnv.txt and use that instead of boot.scr:
-----------------------------------
dvimode=1024x768-16 at 60
uenvcmd=run loaduimage; run mmcboot
-----------------------------------
The variable uenvcmd (if existent) will be executed (using run) after uEnv.txt
was loaded. If uenvcmd doesn't exist the default boot sequence will be started,
therefore you could just use
-----------------------------------
dvimode=1024x768-16 at 60
-----------------------------------
as uEnv.txt because loaduimage and mmcboot is part of the default boot sequence.

For backwards compatibility the use of boot.scr is still supported.
---
Changes for v2:
  - Eliminated else redundant clause that would be ignored if boot
    succeeds.

Signed-off-by: Jason Kridner <jkridner at beagleboard.org>
Cc: Alexander Holler <holler at ahsoftware.de>
---
 include/configs/omap3_beagle.h |   26 ++++++++++++++++++--------
 1 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/include/configs/omap3_beagle.h b/include/configs/omap3_beagle.h
index f151e98..b7f5480 100644
--- a/include/configs/omap3_beagle.h
+++ b/include/configs/omap3_beagle.h
@@ -229,6 +229,9 @@
 	"loadbootscript=fatload mmc ${mmcdev} ${loadaddr} boot.scr\0" \
 	"bootscript=echo Running bootscript from mmc ...; " \
 		"source ${loadaddr}\0" \
+	"loadbootenv=fatload mmc ${mmcdev} ${loadaddr} uEnv.txt\0" \
+	"importbootenv=echo Importing environment from mmc ...; " \
+		"env import -t $loadaddr $filesize\0" \
 	"loaduimage=fatload mmc ${mmcdev} ${loadaddr} uImage\0" \
 	"mmcboot=echo Booting from mmc ...; " \
 		"run mmcargs; " \
@@ -240,15 +243,22 @@
 
 #define CONFIG_BOOTCOMMAND \
 	"if mmc rescan ${mmcdev}; then " \
+		"echo SD/MMC found on device ${mmcdev};" \
+		"if run loadbootenv; then " \
+			"run importbootenv;" \
+		"fi;" \
+		"if test -n $uenvcmd; then " \
+			"echo Running uenvcmd ...;" \
+			"run uenvcmd;" \
+		"fi;" \
 		"if run loadbootscript; then " \
-			"run bootscript; " \
-		"else " \
-			"if run loaduimage; then " \
-				"run mmcboot; " \
-			"else run nandboot; " \
-			"fi; " \
-		"fi; " \
-	"else run nandboot; fi"
+			"run bootscript;" \
+		"fi;" \
+		"if run loaduimage; then " \
+			"run mmcboot;" \
+		"fi;" \
+	"fi;" \
+	"run nandboot;" \
 
 #define CONFIG_AUTO_COMPLETE		1
 /*
-- 
1.5.6.4