Installing Debian - Sun Ultra1

I'm working to install Debian on a Sun Ultra1. I get an error and a kernel
panic on boot.

Hardware:
Sun Ultra 1 SBus (UltraSPARC 143MHz), No Keyboard
OpenBoot 3.11, 256 MB memory installed

I've tried using debian-12.0.0-sparc64-NETINST-1.iso from 2023-05-16 09:05
Along with the snapshot from 2023-06-18 18:21.

I verified the SHA256SUM for both files.

I get the following output regardless of which option I choose in grub:

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#  Boot output via serial
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Loading ...

[   10.116921] Initramfs unpacking failed: write error
/lib/[   33.720592] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00007f00
[   33.813313] CPU: 0 PID: 1 Comm: init Not tainted 6.1.0-9-sparc64 #1
 Debian 6.1.27-1
[   33.906051] Call Trace:
[   33.934213] [<0000000000caaf50>] dump_stack+0x8/0x18
[   33.994076] [<0000000000ca0dd8>] panic+0xec/0x344
[   34.050243] [<000000000046bcec>] do_exit+0x9ec/0xa00
[   34.109695] [<000000000046bee4>] do_group_exit+0x24/0xa0
[   34.173296] [<000000000046bf7c>] sys_exit_group+0x1c/0x40
[   34.237855] [<0000000000406174>] linux_sparc_syscall+0x34/0x44
[   34.307770] Press Stop-A (L1-A) from sun keyboard or send break
[   34.307770] twice on console to return to the boot prom
[   34.442042] ---[ end Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00007f00 ]---
systemd/systemd-udevd: error while loading shared libraries: libkmod.so.2:
cannot open shared object file: No such filey

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Where should I look to start resolving this?

-- 
Jeremy Leonard