board: tbs2910: Use recommended distroboot addresses

According to doc/README.distro fdt_addr must not be set when DTB is not
available from hardware. So remove this entry.

Use address 32MB above the start of DRAM for kernel_addr_r. This way
we likely can avoid the self-relocation of the compressed kernel image
before it decompresses to offset 0x8000 from start of DRAM.

Use address 128MB above the start of DRAM for fdt_addr_r, since this is
the maximum location for the end of the kernel. So we avoid overwriting
the DTB.

Use 512k above that for ramdisk_addr_r. This should be enough for the
DTB, rest of DRAM can be used for initrd.

Place boot script / extlinux.conf at offset 0 / 1MB from start of DRAM.
This space is available for processing in U-Boot.

Signed-off-by: Soeren Moch <smoch@web.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/tbs2910.h

@@ -85,13 +85,12 @@
 			"bootm 0x10800000 0x10d00000\0" \
 	"console=ttymxc0\0" \
 	"fan=gpio set 92\0" \
-	"fdt_addr=0x13000000\0" \
-	"fdt_addr_r=0x13000000\0" \
+	"fdt_addr_r=0x18000000\0" \
 	"fdtfile=" CONFIG_DEFAULT_FDT_FILE "\0" \
-	"kernel_addr_r=0x10008000\0" \
-	"pxefile_addr_r=0x10008000\0" \
-	"ramdisk_addr_r=0x18000000\0" \
-	"scriptaddr=0x14000000\0" \
+	"kernel_addr_r=0x12000000\0" \
+	"pxefile_addr_r=0x10100000\0" \
+	"ramdisk_addr_r=0x18080000\0" \
+	"scriptaddr=0x10000000\0" \
 	"set_con_serial=setenv stdout serial; " \
 			"setenv stderr serial\0" \
 	"set_con_hdmi=setenv stdout serial,vidconsole; " \