omap3_beagle: support findfdt and loadfdt for devicetree support

For folks not using concatenated device tree with uImage, having
an handy function to find and load device tree is very handy.

So introduce findfdt and loadfdt and run findfdt by default to make
it easier on user scripts.

Signed-off-by: Nishanth Menon <nm@ti.com>

diff --git a/include/configs/omap3_beagle.h b/include/configs/omap3_beagle.h
index 4d93ad2fa88f922dd60a29ba9f0fd19ee0474da3..dacabb69108538a1554a1508444da78a5238152f 100644 (file)
--- a/include/configs/omap3_beagle.h
+++ b/include/configs/omap3_beagle.h
@@ -194,6 +194,8 @@
 #define CONFIG_EXTRA_ENV_SETTINGS \
        "loadaddr=0x80200000\0" \
        "rdaddr=0x81000000\0" \
+       "fdt_high=0xffffffff\0" \
+       "fdtaddr=0x80f80000\0" \
        "usbtty=cdc_acm\0" \
        "bootfile=uImage\0" \
        "ramdisk=ramdisk.gz\0" \
@@ -234,6 +236,17 @@
                "omapdss.def_disp=${defaultdisplay} " \
                "root=${nandroot} " \
                "rootfstype=${nandrootfstype}\0" \
+       "findfdt=" \
+               "if test $beaglerev = AxBx; then " \
+                       "setenv fdtfile omap3-beagle.dtb; fi; " \
+               "if test $beaglerev = Cx; then " \
+                       "setenv fdtfile omap3-beagle.dtb; fi; " \
+               "if test $beaglerev = xMAB; then " \
+                       "setenv fdtfile omap3-beagle-xm.dtb; fi; " \
+               "if test $beaglerev = xMC; then " \
+                       "setenv fdtfile omap3-beagle-xm.dtb; fi; " \
+               "if test $fdtfile = undefined; then " \
+                       "echo WARNING: Could not determine device tree to use; fi; \0" \
        "bootenv=uEnv.txt\0" \
        "loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenv}\0" \
        "importbootenv=echo Importing environment from mmc ...; " \
@@ -249,6 +262,7 @@
                "rootfstype=${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" \
        "mmcboot=echo Booting from mmc ...; " \
                "run mmcargs; " \
                "bootm ${loadaddr}\0" \
@@ -265,6 +279,7 @@
        "userbutton_nonxm=gpio input 7;\0"
 /* "run userbutton" will return 1 (false) if pressed and 0 (true) if not */
 #define CONFIG_BOOTCOMMAND \
+       "run findfdt; " \
        "mmc dev ${mmcdev}; if mmc rescan; then " \
                "if run userbutton; then " \
                        "setenv bootenv uEnv.txt;" \