On Thu, Nov 19, 2009 at 10:05:06PM +0200, Dmitri Vorobiev wrote:
> On Thu, Nov 19, 2009 at 7:00 PM, Martin Michlmayr <firstname.lastname@example.org> wrote:
> > * Dmitri Vorobiev <email@example.com> [2009-11-19 18:56]:
> >> > Some Debian users have reported that the kernel hangs early
> >> > during boot on some IP22 systems. Thomas Bogendoerfer found
> >> > that this is due to a "bad interaction between CONFIG_EARLY_PRINTK
> >> > and overwritten prom memory during early boot". Since there's
> >> > no fix yet, disable CONFIG_EARLY_PRINTK for now.
> >> Never experienced anything like that, although I'm quite extensively
> >> using IP22 with recent kernels. Any details on the hangs?
> > It doesn't happen on all machines. It has been reported e.g. with an
> > Indigo2. See http://bugs.debian.org/507557
> Interesting, thanks. Good to know that, since one of my machines is Indigo2.
I guess is depending on RPOM version and installed memory. I haven't
figured out exactly which parts get overwritten, but since we completely
ignore ARCS reservered memory and still use ARCS prom calls, it's not
a real safe game we are doing.
Crap can work. Given enough thrust pigs will fly, but it's not necessary a
good idea. [ RFC1925, 2.3 ]