Boot of K3OS failed: Failed to determine boot mode

[maxmeyer]

Version (k3OS / kernel)

k3os-20440 [~]$ uname --kernel-release --kernel-version
5.0.0-43-generic #47~18.04.1 SMP Wed Apr 1 16:27:01 UTC 2020

k3os-20440 [~]$ k3os --version
k3os version v0.10.0

Architecture

k3os-20440 [~]$ uname --machine
x86_64

Describe the bug

k3sos does not boot if installed on a regular USB-stick. Instead it fails with Failed to determine boot mode and drops into a bash.

To Reproduce

• Setup of disks

  • 2 SATA disks connected via SATA (sda, sdb)
  • 1 USB-stick connected via USB 2.0 (sdc)

  sda      8:0    0   1.8T  0 disk
  └─sda1   8:1    0   1.8T  0 part
  sdb      8:16   0   1.8T  0 disk
  └─sdb1   8:17   0   1.8T  0 part
  sdc      8:32   1  14.9G  0 disk
  ├─sdc1   8:33   1    47M  0 part
  └─sdc2   8:34   1  14.9G  0 part /k3os/system

• Mainboard: unknown (BareBone IPC, ~ 2014)

• Install K3OS from USB-CDROM in UEFI-mode onto USB-stick

• Reboot K3OS

Expected behavior

k3os boots without any error.

Actual behavior

Additional context

• BIOS is kind a old - this is just some of my test equipment

• I can configure some kind of USB emulation in the BIOS

• If I force the BIOS to emulate a harddisk K3OS boots as expected most times, but sometimes it still fails to boot

  

• If I set the emulation into auto K3OS does not boot

  

[maxmeyer]

https://github.com/rancher/k3os/issues/458#issuecomment-624822307 looks similar

[stuartpb]

Also looks like #376

[maxmeyer]

@stuartpb Thanks for having looked at this.