fix fwupdate initramfs

board/common/overlay-initramfs/init

@@ -6,14 +6,20 @@ msg() {
     echo "* $1"
 }
 
+msg "Waiting for sdcard"
+sleep 2
+
+msg "Mounting pseudo filesystems"
+mount -t devtmpfs devtmpfs /dev
+mount -t proc proc /proc
+
 ROOT_DEV=$(cat /proc/cmdline | grep -oE 'root=[/a-z0-9]+' | cut -d '=' -f 2)
-if [[ "$ROOT_DEV" =~ ^([/a-z0-9]+)(p[0-9])$ ]]; then  # e.g. /dev/mmcblk0p2
-    DISK_DEV=${BASH_REMATCH[1]}
+if echo ${ROOT_DEV: -2} | grep -E 'p[0-9]' &>/dev/null; then  # e.g. /dev/mmcblk0p2
+    DISK_DEV=${ROOT_DEV:0:$((${#ROOT_DEV}-2))}
     BOOT_DEV=${DISK_DEV}p1
     DATA_DEV=${DISK_DEV}p3
 else  # e.g. /dev/sdc2
-    [[ "$ROOT_DEV" =~ ^([/a-z0-9]+)([0-9])$ ]]
-    DISK_DEV=${BASH_REMATCH[1]}
+    DISK_DEV=${ROOT_DEV:0:$((${#ROOT_DEV}-1))}
     BOOT_DEV=${DISK_DEV}1
     DATA_DEV=${DISK_DEV}3
 fi
@@ -52,13 +58,6 @@ on_exit() {
 
 trap on_exit EXIT
 
-msg "Waiting for sdcard"
-sleep 2
-
-msg "Mounting pseudo filesystems"
-mount -t devtmpfs devtmpfs /dev
-mount -t proc proc /proc
-
 if [ -x /prepare_initramfs ]; then
     msg "Preparing initramfs"
     /prepare_initramfs

board/common/overlay/sbin/fwupdate

@@ -229,7 +229,7 @@ function flash_boot() {
     echo $pid > $FW_DIR/$DD_PID_FILE
     wait $pid
 
-    mount -o rw /boot
+    mount -T /etc/fstab.disk -o rw /boot
     
     # the /usr/libexec/fw-restore-boot-cfg script, if present, takes the old (backup) boot dir as argument
     # and should restore any /boot configuration that needs to be preserved across updates