Fresh NetBSD 9 installation fails to boot in Qemu

[Jason Thorpe <thorpej%apple.com@localhost>]

I just installed NetBSD/macppc 9.0 in a Qemu VM by booting the NetBSD/macppc ISO image and running through the installer.  It installed to a fresh 8G "raw" image -- so no existing partition map, etc.

The installation went perfectly fine, but now booting from the (virtual) hard drive results in:

>> =============================================================
>> OpenBIOS 1.1 [Oct 28 2019 17:09]
>> Configuration device id QEMU version 1 machine id 1
>> CPUs: 1
>> Memory: 512M
>> UUID: 00000000-0000-0000-0000-000000000000
>> CPU type PowerPC,G4
milliseconds isn't unique.
Welcome to OpenBIOS v1.1 built on Oct 28 2019 17:09
Trying hd:,\\:tbxi...
Trying hd:,\ppc\bootinfo.txt...
Trying hd:,%BOOT...
>> Not a bootable ELF image
>> switching to new context:

OF_open bootpath=/pci@f2000000/mac-io@c/ata-3@20000/disk@0
read stage 2 blocks: 0123. done!
starting stage 2...

>> NetBSD/macppc OpenFirmware Boot, Revision 1.13 (Fri Feb 14 00:06:28 UTC 2020)
@@@@@@@@@open /netbsd: No such file or directory
@@@@@@@@@open /netbsd.gz: No such file or directory
@@@@@@@@@open /netbsd.macppc: No such file or directory
Boot: 


I booted back to the installer image, and verified that /netbsd is present.

Any ideas?

-- thorpej