Problem with a SunFire V120 -- Kernel panics when trying to install

[Yan Morissette <n30h4v3n@gmail.com>]

Every single time I try to install Debian with the sparc netboot image
(Of course, I'm using latest), after one to a few dialogs (usually
right after selecting country, sometimes after locale and sometimes
after DHCP config) the V120 crashes with the following being sent out
the LOM port:

[  254.915075] Unable to handle kernel NULL pointer dereference
[  254.915075] Unable to handle kernel NULL pointer dereference
[  255.109349] tsk->{mm,active_mm}->context = 0000000000000ad8
[  255.109349] tsk->{mm,active_mm}->context = 0000000000000ad8
[  255.302290] tsk->{mm,active_mm}->pgd = fffff8001d838000
[  255.302290] tsk->{mm,active_mm}->pgd = fffff8001d838000
[  255.486760] Kernel panic - not syncing: Aiee, killing interrupt handler!
[  255.486760] Kernel panic - not syncing: Aiee, killing interrupt handler!
[  255.707837] Press Stop-A (L1-A) to return to the boot prom
[  255.707837] Press Stop-A (L1-A) to return to the boot prom

I tried searching the mailing lists and google, the only thing I've
found points to this being about usb-storage, but I have no idea how
to disable this or fix this problem.