target/linux/bcm4908/base-files/lib/preinit/75_rootfs_prepare

   1 # SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause
   2
   3 . /lib/functions/bcm4908.sh
   4
   5 rootfs_create() {
   6         local blocks
   7
   8         blocks=$(cat /sys/class/ubi/ubi0/avail_eraseblocks)
   9         [ -z "$blocks" ] && {
  10                 echo "Failed to read amount of available erase blocks" >&2
  11                 return
  12         }
  13
  14         # Use 80% of remaining flash size for "rootfs_data"
  15         ubimkvol /dev/ubi0 -n 20 -N rootfs_data --lebs $((blocks / 100 * 80))
  16         mknod -m 0600 /dev/ubi0_20 c 252 21
  17
  18         bcm4908_verify_rootfs_data ubi0_20
  19 }
  20
  21 rootfs_prepare() {
  22         # Do nothing on CFE devices
  23         ubinfo /dev/ubi0 -N metadata1 > /dev/null 2>&1 || return
  24
  25         # Find UBI volume device (e.g. ubi0_123)
  26         local ubivol="$(grep rootfs_data /sys/class/ubi/ubi*/name | sed -n 's/.*\(ubi\d*_\d*\).*/\1/p')"
  27         if [ -n "$ubivol" ]; then
  28                 bcm4908_verify_rootfs_data $ubivol
  29         else
  30                 echo "Creating \"rootfs_data\" UBI volume"
  31                 rootfs_create
  32         fi
  33 }
  34
  35 boot_hook_add preinit_main rootfs_prepare