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recovery-initramfs: register mdev regardless of /proc/sys/kernel/hotplug 

Busybox's device manager mdev was originally meant to be set up by writing its
path to /proc/sys/kernel/hotplug before launching it, but that entry no longer
exists in Linux v5.4's procfs and mdev can be launched directly.

Since mdev is the element in the recovery initramfs that is in charge of
mounting all partitions where .swu packages can be found (update partition on
the eMMC/MTD, uSD and USB), checking for the existence of the hotplug entry in
the procfs before launching mdev in v5.4 was preventing the partitions from
being mounted, and causing all software updates to fail.

While at it, move the two second delay to before mdev is launched, so all
partitions can be mounted. Otherwise, some devices such as the USB might not
be ready when mdev is launched, causing its partition to not be mounted.

https://jira.digi.com/browse/DEL-7143

Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>
This commit is contained in:
Gabriel Valcazar 2020-06-17 17:18:46 +02:00
parent b793b3faae
commit 48f8720a23
1 changed files with 6 additions and 9 deletions
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15
meta-digi-dey/recipes-core/recovery/recovery-initramfs/recovery-initramfs-init
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@ -374,17 +374,14 @@ mount -t sysfs sysfs /sys
mount -t devtmpfs devtmpfs /dev mount -t devtmpfs devtmpfs /dev
mount -t tmpfs tmpfs /tmp mount -t tmpfs tmpfs /tmp
# Register mdev as device manager # Give some time for the devices to settle down so mdev can mount all of them
if [ -f /proc/sys/kernel/hotplug ]; then
echo > /dev/mdev.seq
echo > /dev/mdev.log
echo "/sbin/mdev" > /proc/sys/kernel/hotplug
mdev -s
fi
# Give some time for the devices to settle down
sleep 2 sleep 2
# Register mdev as device manager
echo > /dev/mdev.seq
echo > /dev/mdev.log
mdev -s
# Run all shell scripts in postinstall folder # Run all shell scripts in postinstall folder
run-parts /etc/*-postinsts run-parts /etc/*-postinsts