Hi Adrian,

> This looks more like an issue with your bootloader. I haven't used SILO for a
> long time, so I don't have a track what currently works and what not.

Thanks for pointing that out! I was searching in the wrong direction...

> Can you try booting the current ISO snapshot image?

Yes, that image boots successfully on this machine, with a newer kernel, using 
GRUB instead of SILO.

So the actual issue is that Debian kernels > 5.14.3-1~exp1 fail to boot with 
SILO 1.4.14+git20141019-5.
I've also built the latest SILO from git [1] but it has the same issue: it 
boots Debian kernel 5.14.3-1~exp1
successfully, but later Debian kernels fail with ERROR: Last Trap: Fast Data 
Access MMU Miss.

I had previously given up on migrating to GRUB, as I couldn't get it to work 
with RAID1 boot and root
partitions on disks with a Sun disk label. I still can't get that working but 
I'll start a separate thread
for that.

As this SPARC T4-1 is able to boot from disks with GPT/EFI disk label, I've 
converted the disks to use
a GPT/EFI label with a dedicated BIOS boot partition and installed GRUB using 
the instructions at [2].
It is working fine with RAID1 boot and root partitions and with newer Debian 

It would still be nice to know why newer Debian kernels fail to boot with SILO, 
but I don't know how
to debug ERROR: Last Trap: Fast Data Access MMU Miss.

This Debian bug report can be closed as resolved by migrating from SILO to GRUB.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/davem/silo.git
[2] https://github.com/esnowberg/grub2-sparc/wiki

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