Hello,

I used mmcblk0 as the initial boot disk and was able to get coreos installed and fully operational.  I then added a disk sda.  I reinstalled (via PXE - fully wipe) coreos on mmcblk0

Generating "/run/initramfs/rdsosreport.txt"


Entering emergency mode. Exit the shell to continue.
Type "journalctl" to view system logs.
You might want to save "/run/initramfs/rdsosreport.txt" to a USB stick or /boot
after mounting them and attach it to a bug report.

possible culprit segment: (attached full report)

0m] Started dracut initqueue hook.
[   19.087502] audit: type=1130 audit(1569089886.588:10): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=dracut-initqueue comm="systemd'
[   19.087975] systemd[1]: Reached target Remote File Systems (Pre).
[  OK  ] Reached target Remote File Systems (Pre).
[  OK     19.122542] systemd[1]: Reached target Remote File Systems.
0m] Reached target Remote File Systems.
[   19.139331] systemd[1]: Starting dracut pre-mount hook...
         Starting dracut pre-mount hook...
[   19.187689] systemd[1]: Started dracut pre-mount hook.
[  OK  ] Started dracut pre-mount hook.
[   19.201538] audit: type=1130 audit(1569089886.702:11): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=dracut-pre-mount comm="systemd'
[   19.204533] systemd[1]: Starting File System Check on /dev/disk/by-label/root...
         Starting File System Check on /dev/disk/by-label/root...
[   19.260857] systemd-fsck[863]: /usr/sbin/fsck.xfs: XFS file system.
[  OK     19.270410] systemd[1]: Started File System Check on /dev/disk/by-label/root.
0m] Started File System Check on /dev/disk/by-label/root.
[   19.291614] systemd[1]: Mounting /sysroot...
         Mountin[   19.296078] audit: type=1130 audit(1569089886.789:12): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=systemd-fsck-r'
g /sysroot...
[   19.771792] SGI XFS with ACLs, security attributes, scrub, no debug enabled
[   19.788579] XFS (sda4): Mounting V5 Filesystem
[   19.813813] XFS (sda4): Ending clean mount
[  OK     20.125540] systemd[1]: Mounted /sysroot.
0m] Mounted /sysroot.
[   20.137017] systemd[1]: Condition check resulted in Remount /sysroot read-write for Ignition being skipped.
         Startin[   20.147072] systemd[1]: Starting OSTree Prepare OS/...
g OSTree Prepare OS/   20.155340] ostree-prepare-root[885]: ostree-prepare-root: Couldn't find specified OSTree root '/sysroot//ostree/boot.1/fedora-corey
m...
[   19.202077] ostree-prepare-root[885]: ostree-prepare-root: Couldn't find specified OSTree root '/sysroot//ostree/boot.1/fedora-coreos/b2601a3ea2062ef1y
[FAILED[   20.201741] systemd[1]: ostree-prepare-root.service: Main process exited, code=exited, status=1/FAILURE
] Failed to [   20.212566] systemd[1]: ostree-prepare-root.service: Failed with result 'exit-code'.
start O[   20.221776] systemd[1]: Failed to start OSTree Prepare OS/.
STree Prepare OS/

Let me know if you need any other info