UEFI boot dropping to startup.nsh prompt

[Laura Smith]

I'm building a UEFI image for Debian Bookworkm, but when I load the qcow2 and attempt to boot it, it drops into a startup.nsh prompt as below.

I have tried building with grub-efi-amd64-signed instead of grub-efi-amd64, but that does not make any difference.

Any ideas how I can troubleshoot ?

Thanks !

UEFI Interactive Shell v2.2
EDK II
UEFI 2.70 (EDK II, 0x00010000)
Mapping table
FSO: Alias (s) :HDOb: : BLK1:
PciRoot (0x0) /Pci (0x4,0x0) /HD (1,GPT,41F5FCD7-6BFF-49A0-B726-E168F937E46D,0x800,0x100000)
BLKO: Alias (s) :
PciRoot (0x0) /Pci (0x4,0×0)
BLK2: Alias (s) :
PciRoot (0x0) /Pci (0x4,0x0) /HD (2,GPT ,F6E9D048-1C74-4A2E-A196-6BFE311BEE82,0×100800,0x1C3800)
BLK3: Alias (s) :
PciRoot (0x0) /Pci (0x4,0x0) /HD (3,GPT ,9F400A0A-EE84-4F72-BA36-431EEB828209,0x2C4000,0x113B800)
Press ESC in 1 seconds to skip startup.nsh or any other key to continue.Shell>
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