bcm53xx: add (disabled) support for upgrading kernel during sysupgrade

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45445 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/bcm53xx/base-files/lib/upgrade/platform.sh b/target/linux/bcm53xx/base-files/lib/upgrade/platform.sh
index 876da4d..034fb8e 100644 (file)
--- a/target/linux/bcm53xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/bcm53xx/base-files/lib/upgrade/platform.sh
@@ -150,6 +150,23 @@ platform_pre_upgrade() {
 
        echo "Provided firmware contains kernel and UBI image, but flashing it is unsupported yet"
        exit 1
+
+       # Prepare TRX file with just a kernel that will replace current one
+       local linux_length=$(grep "\"linux\"" /proc/mtd | sed "s/mtd[0-9]*:[ \t]*\([^ \t]*\).*/\1/")
+       [ -z "$linux_length" ] && {
+               echo "Unable to find \"linux\" partition size"
+               exit 1
+       }
+       linux_length=$((0x$linux_length + 28))
+       rm -f /tmp/null.bin
+       rm -f /tmp/kernel.trx
+       touch /tmp/null.bin
+       otrx create /tmp/kernel.trx \
+               -f $dir/kernel -b $linux_length \
+               -f /tmp/null.bin
+
+       # Flash
+       mtd write /tmp/kernel.trx firmware
 }
 
 platform_do_upgrade() {