omap3_beagle: xM A/B validate new dtb exits in file system

Fall back to previous dtb used when omap3-beagle-xm-ab.dtb doesn't exist in file system

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
CC: Tom Rini <trini@ti.com>
CC: Nishanth Menon <nm@ti.com>
Acked-by: Tom Rini <trini@ti.com>

diff --git a/include/configs/omap3_beagle.h b/include/configs/omap3_beagle.h
index 2390564832748c2ded03c2f06176a46c1d6c340b..d07e52dfd3dc5998e39b903aaf6c6b9f5af2c5e9 100644 (file)
--- a/include/configs/omap3_beagle.h
+++ b/include/configs/omap3_beagle.h
@@ -175,6 +175,12 @@
                        "setenv fdtfile omap3-beagle-xm.dtb; fi; " \
                "if test $fdtfile = undefined; then " \
                        "echo WARNING: Could not determine device tree to use; fi; \0" \
+       "validatefdt=" \
+               "if test $beaglerev = xMAB; then " \
+                       "if test ! -e mmc ${bootpart} ${bootdir}/${fdtfile}; then " \
+                               "setenv fdtfile omap3-beagle-xm.dtb; " \
+                       "fi; " \
+               "fi; \0" \
        "bootenv=uEnv.txt\0" \
        "loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenv}\0" \
        "importbootenv=echo Importing environment from mmc ...; " \
@@ -190,7 +196,7 @@
                "rootfstype=${ramrootfstype}\0" \
        "loadramdisk=load mmc ${bootpart} ${rdaddr} ${bootdir}/${ramdisk}\0" \
        "loadimage=load mmc ${bootpart} ${loadaddr} ${bootdir}/${bootfile}\0" \
-       "loadfdt=load mmc ${bootpart} ${fdtaddr} ${bootdir}/${fdtfile}\0" \
+       "loadfdt=run validatefdt; load mmc ${bootpart} ${fdtaddr} ${bootdir}/${fdtfile}\0" \
        "mmcboot=echo Booting from mmc ...; " \
                "run mmcargs; " \
                "bootm ${loadaddr}\0" \