LILO memory usage:
000600 - 001000 BIOS data check area. Okay to overwrite. LILO usage
suppressed with command line "nobd" option. There's also a config
file option to suppress usage.
LILO typically loads at 9000:0000 up to the top of the EBDA. Top of
EBDA is determined by "int 12h." Some BIOS's on add-in cards do not
properly allocate the EBDA. Use LILO Makefile option "BUG_SI_EBDA"
to allocate extra EBDA for the BIOS. If the BIOS data check area is
created at boot time by LILO, then:
> lilo -T ebda
will tell you where LILO is loaded on your system.
--John
At 02:39 PM Sunday 8/27/2006, H. Peter Anvin wrote:
Andi Kleen wrote:
On Sunday 27 August 2006 21:32, H. Peter Anvin wrote:
Andi Kleen wrote:
Just increasing that constant caused various lilo setups to not boot
anymore. I don't know who is actually to blame, just wanting to
point out that this "obvious" patch isn't actually that obvious.
How would that even be possible (unless you recompiled LILO with
the new headers)? There would be no difference in the memory
image at the point LILO hands off to the kernel.
AFAIK the problem was that some EDD data got overwritten.
In order to reproduce this we need some details about your
"various LILO setups", or this will remain as a source of cargo
cult programming.
You can search the mailing list archives, it's all in there if you don't
belive me.
Found the references. This seems to imply that EDD overwrites the
area used by LILO 22.6.1. LILO 22.6.1 uses the new boot protocol,
with the full pointer, and seems to obey the spec as far as I can
read the code. I'm going to try to run it in simulation and observe
the failure that way.
However, something is still seriously out of joint. The EDD data
actually overlays the setup code, not the bootsect code, and thus
there "shouldn't" be any way that this could interfere. My best
guess at this time is that either the EDD code or LILO uses memory
it's not supposed to use, and the simulation should hopefully reveal that.
Sorry if I seem snarky on this, but if we can't get to the bottom of
this we can't ever fix it.
-hpa
PGP KeyID: 6781C9C8 (good until 31-Dec-2008)
Keyserver at ldap://keyserver.pgp.com OR http://pgp.mit.edu
LILO links at http://freshmeat.net/projects/lilo
and Help link at http://lilo.go.dyndns.org
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