at91: add Device Tree based board detection

Set up eth0 as LAN interface by default.

Backport of r46174

Signed-off-by: Florian Fainelli <florian@openwrt.org>


git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@46419 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/at91/base-files/lib/preinit/03_preinit_do_at91.sh

@@ -1,9 +1,9 @@
 #!/bin/sh
 
 do_at91() {
-	[ -e "/tmp/sysinfo/" ] || mkdir -p "/tmp/sysinfo/"
-	echo $(strings /proc/device-tree/compatible | head -1) > /tmp/sysinfo/board_name
-	echo $(cat /proc/device-tree/model) > /tmp/sysinfo/model
+	. /lib/at91.sh
+
+	at91_board_detect
 }
 
 boot_hook_add preinit_main do_at91