Adding more details, for context: bbb with: U-Boot 2015.10-rc4 + single ext4 gpt partition + without PARTUUID patch:
Begin: Running /scripts/local-premount ... done. Begin: Checking root file system ... fsck from util-linux 2.25.2 rootfs: clean, 14370/972944 files, 173063/3889275 blocks done. mount: mounting PARTUUID=63a4b660-79ee-4fc5-a51f-65a7ffc27c5c on /root failed: No such file or directory done. Target filesystem doesn't have requested /sbin/init. Begin: Running /scripts/local-bottom ... done. Begin: Running /scripts/init-bottom ... mount: mounting /dev on /root/dev failed: No such file or directory done. No init found. Try passing init= bootarg. modprobe: module i8042 not found in modules.dep modprobe: module ehci-orion not found in modules.dep modprobe: module uhci-hcd not found in modules.dep modprobe: module ohci-hcd not found in modules.dep BusyBox v1.22.1 (Debian 1:1.22.0-9+deb8u1) built-in shell (ash) Enter 'help' for a list of built-in commands. /bin/sh: can't access tty; job control turned off (initramfs) cat /proc/cmdline console=ttyO0,115200n8 root=PARTUUID=63a4b660-79ee-4fc5-a51f-65a7ffc27c5c ro rootfstype=ext4 rootwait Note: udev only creates "partuuid" for gpt partitions: /dev/disk/by-partuuid/<uuid> So this fix will work for any omap4+ bootrom (omap4/omap5/am33x/am4x/am5x device) with a gpt partition. But while testing this late last night on imx6 devices yesterday i noticed they won't boot with a gpt partition. (most imx6 devices have multiple mmcblk devices so the partuuid=<uuid> passing would be beneficial) So we'd also need to fix systemd/udev and drop the "gpt" requirement... non-gpt-partition: PARTUUID=0009729a-01 gpt-partition: PARTUUID=63a4b660-79ee-4fc5-a51f-65a7ffc27c5c https://github.com/systemd/systemd/blob/master/rules/60-persistent-storage.rules#L76-L77 # by-partlabel/by-partuuid links (partition metadata) ENV{ID_PART_ENTRY_SCHEME}=="gpt", ENV{ID_PART_ENTRY_UUID}=="?*", SYMLINK+="disk/by-partuuid/$env{ID_PART_ENTRY_UUID}" Otherwise we'd need to somehow convert PARTUUID=<uuid> to UUID=<uuid_other> in the initramfs for none-gpt partitions... As a quick hack i was thinking "UUID=$(blkid | grep <non-gpt-uuid> | awk <x>)" in scripts/function but that looked ugly... Regards, -- Robert Nelson https://rcn-ee.com/
