@@ -43,6 +43,18 @@ udev_trigger_root_device() {
PARTUUID=?*)
root_match="PARTUUID=${bootparam_root#PARTUUID=}"
;;
+ LABEL=?*)
+ # The kernel does not export the filesystem LABEL in the
+ # uevent, so resolve it to a device node with findfs and
+ # match on that device's kernel-provided PARTUUID.
+ root_label="${bootparam_root#LABEL=}"
+ root_dev=$(findfs "LABEL=$root_label" 2>/dev/null) || return 1
+ [ -n "$root_dev" ] || return 1
+ root_partuuid=$(sed -n 's/^PARTUUID=//p' \
+ "/sys/class/block/${root_dev#/dev/}/uevent" 2>/dev/null)
+ [ -n "$root_partuuid" ] || return 1
+ root_match="PARTUUID=$root_partuuid"
+ ;;
*)
return 1
;;
@@ -88,7 +88,7 @@ RDEPENDS:initramfs-module-mdev = "${PN}-base busybox-mdev"
FILES:initramfs-module-mdev = "/init.d/01-mdev"
SUMMARY:initramfs-module-udev = "initramfs support for udev"
-RDEPENDS:initramfs-module-udev = "${PN}-base udev"
+RDEPENDS:initramfs-module-udev = "${PN}-base udev util-linux-findfs"
FILES:initramfs-module-udev = "/init.d/01-udev"
SUMMARY:initramfs-module-e2fs = "initramfs support for ext4/ext3/ext2 filesystems"
Filesystem labels are not available in kernel uevents. Add util-linux-findfs to initramfs-module-udev and use findfs to resolve root=LABEL= to a device. Read the kernel-provided PARTUUID from sysfs and trigger only that partition, falling back to a full trigger if the label cannot be resolved safely. Keeping findfs out of the BusyBox defconfig avoids increasing BusyBox for unrelated users. Tested with bitbake -p and by generating the core-image-minimal-initramfs dependency graph. AI-Generated: OpenAI Codex Signed-off-by: Wenwen Fu <wenwfu@qti.qualcomm.com> --- Changes in v2: - Keep findfs out of the default BusyBox configuration. - Add util-linux-findfs as an initramfs-module-udev runtime dependency. --- .../initrdscripts/initramfs-framework/udev | 12 ++++++++++++ .../initrdscripts/initramfs-framework_1.0.bb | 2 +- 2 files changed, 13 insertions(+), 1 deletion(-)