diff options
author | Adriana Kobylak <anoo@us.ibm.com> | 2020-06-04 00:22:42 +0300 |
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committer | Andrew Geissler <geissonator@yahoo.com> | 2020-07-15 00:27:57 +0300 |
commit | 0998d1e4fc58e668ccf2ea5e07b86317b066160d (patch) | |
tree | 1e05075a6acf802c3dedcce2988dcd1255de23b8 /meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init | |
parent | 56e14d9ed010fd5e87a83522a3eee8bd5cd30ccc (diff) | |
download | openbmc-0998d1e4fc58e668ccf2ea5e07b86317b066160d.tar.xz |
initramfs: Add init script for eMMC
This init script mounts the rootfs based on the root u-boot env
variable, mounts the read-write filesystem and sets up the overlay.
(From meta-phosphor rev: 86164b2e072cc6cebc9caf1614e2b1fa0e0884a0)
Change-Id: If9121048b6223d5391e5f6a8b7d6cd7d22707969
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Diffstat (limited to 'meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init')
-rw-r--r-- | meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init/mmc-init.sh | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init/mmc-init.sh b/meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init/mmc-init.sh new file mode 100644 index 000000000..ec4b745db --- /dev/null +++ b/meta-phosphor/recipes-phosphor/initrdscripts/phosphor-mmc-init/mmc-init.sh @@ -0,0 +1,51 @@ +#!/bin/sh + +# Get the value of the root env variable found in /proc/cmdline +get_root() { + local root="$(cat /proc/cmdline)" + root="${root##* root=PARTLABEL=}" + root="${root%% *}" + [ "${root}" != "" ] && echo "${root}" +} + +fslist="proc sys dev run" +rodir=/mnt/rofs +cd / +mkdir -p $fslist +mount dev dev -tdevtmpfs +mount sys sys -tsysfs +mount proc proc -tproc +mount tmpfs run -t tmpfs -o mode=755,nodev + +# Move the secondary GPT to the end of the device if needed. Look for the GPT +# header signature "EFI PART" located 512 bytes from the end of the device. +magic=$(tail -c 512 /dev/mmcblk0 | hexdump -C -n 8 | grep "EFI PART") +if test -z "${magic}"; then + sgdisk -e /dev/mmcblk0 + partprobe +fi + +# There eMMC GPT labels for the rootfs are rofs-a and rofs-b, and the label for +# the read-write partition is rwfs. Run udev to make the partition labels show +# up. Mounting by label allows for partition numbers to change if needed. +udevd --daemon +udevadm trigger --type=devices --action=add +udevadm settle --timeout=10 + +mkdir -p $rodir +if ! mount /dev/disk/by-partlabel/"$(get_root)" $rodir -t ext4 -o ro; then + /bin/sh +fi +if ! mount /dev/disk/by-partlabel/rwfs $rodir/var -t ext4 -o rw; then + /bin/sh +fi + +rm -rf $rodir/var/persist/etc-work/ +mkdir -p $rodir/var/persist/etc $rodir/var/persist/etc-work $rodir/var/persist/home/root +mount overlay $rodir/etc -t overlay -o lowerdir=$rodir/etc,upperdir=$rodir/var/persist/etc,workdir=$rodir/var/persist/etc-work + +for f in $fslist; do + mount --move $f $rodir/$f +done + +exec chroot $rodir /sbin/init |