Comment 0 for bug 1906552

I first noticed this on a focal daily image (http://cdimage.ubuntu.com/ubuntu-server/focal/daily-preinstalled/20201202/ or the current pending one should be able to reproduce it). On the rpi400 device, it goes into a reboot loop. I'm also seeing this behavior with the current uc20 arm64 images on rpi400, and I suspect the same problem could be happening on cm4, but I can't confirm that yet because I don't have one in front of me.

Here's the output I'm getting from serial before it goes into the reboot loop (it gives this output each time it reboots):
U-Boot 2020.10+dfsg-1ubuntu0~20.04.1 (Nov 12 2020 - 17:05:18 +0000)

DRAM: 3.9 GiB
RPI: Board rev 0x13 outside known range
RPI Unknown model (0xc03130)
MMC: mmcnr@7e300000: 1, emmc2@7e340000: 0
Loading Environment from FAT... ** No partition table - mmc 0 **
In: serial
Out: vidconsole
Err: vidconsole
Net: eth0: ethernet@7d580000
PCIe BRCM: link up, 5.0 Gbps x1 (SSC)
starting USB...
Bus xhci_pci: probe failed, error -110
No working controllers found
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
** No partition table - mmc 0 **
Card did not respond to voltage select!
starting USB...
Bus xhci_pci: probe failed, error -110
No working controllers found
USB is stopped. Please issue 'usb start' first.
starting USB...
Bus xhci_pci: probe failed, error -110
No working controllers found
"Synchronous Abort" handler, esr 0x96000044
elr: 000000000009c1c0 lr : 0000000000091edc (reloc)
elr: 000000003b3751c0 lr : 000000003b36aedc
x0 : 0000000000000031 x1 : 0000000000000051
x2 : 20d51c1000580003 x3 : 409400002fd519f2
x4 : 20d2800800d51e10 x5 : 0000000000000014
x6 : 000000003b3d2e40 x7 : 20d2800800d51df0
x8 : 0000000000000000 x9 : 0000000000000008
x10: 00000000ffffffd0 x11: 000000000000000d
x12: 0000000000000006 x13: 000000000001869f
x14: 000000003af2ceb0 x15: 0000000000000002
x16: 000000003b377278 x17: 33a26b1e70c6e1df
x18: 000000003af38d90 x19: 0000000000000021
x20: 000000003b3d2d00 x21: 000000003afcac50
x22: 000000000000000b x23: 00000000ffffffff
x24: 0000000000000002 x25: 000000003b3e5594
x26: 000000003b3bee1b x27: 000000003b3c74cb
x28: 0000000000000020 x29: 000000003af2c4f0

Code: a9410803 8b130001 b2400273 f9000413 (f9000c62)
Resetting CPU ...

resetting ...