Re: 2.6.38.3 and 2.6.39-rc4 hangs after "Booting the kernel" on quad Pentium Pro system
From: Chris Samuel
Date: Fri Apr 22 2011 - 20:17:03 EST
Syt mae Alan! ;-)
On Sat, 23 Apr 2011 02:34:22 AM Alan Cox wrote:
> earlyprintk=vga
Ahh, that's a new one on me, and it reveals that the kernel
has gone from 2.6.18 detecting:
256MB LOWMEM available.
to 2.6.39-rc4 detecting:
16MB LOWMEM available.
That would explain an awful lot..
> (or better yet earlyprintk=ttyS0 and a serial port)
Hmm, I might still have a null modem cable hanging around..
> There are a couple of PPro funnies - there's an area of memory that
> must be excluded due to a chip errata and I seem to remember some
> PPro boxes also having slightly quirking E820 (BIOS memory
> reporting behaviour)
Sigh, that's just reminded me that a couple of years ago I
had a private discussion with H. Peter Anvin about 2.6.25
panic'ing on boot with:
initrd extends beyond end of memory (0x0ffef173 > ox01000000)
He gave me a modified syslinux to dump out memory information
and it reported:
INT 15h = f000:f859 DOS RAM: 638K (0x9f800) INT 12h: 638K (0x9f800)
INT 15 88: 0x3c00 (15360K) INT 15 E801: 0x0000 (0K) 0x0000 (0K)
He responded with:
# Right... you have a system dependent on E801, and somehow E801
# returns crap.
#
# I'm going to cook up a modified meminfo.c32 for you and see if
# we can't track this down.
Unfortunately nothing happened and when I prodded him it turned
out he'd been too busy, so I just kept on running old kernels
from that point on and completely forgot about why. :-(
Hope life is still good in Abertawe!
Chris
--
Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC
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