Re: 2.0.33 bzImage booting errors

H. Peter Anvin (hpa@transmeta.com)
23 Mar 1998 22:55:35 GMT

Followup to: <m0yH50G-000aQEC@the-village.bc.nu>
By author: alan@lxorguk.ukuu.org.uk (Alan Cox)
In newsgroup: linux.dev.kernel
>
> > If it is any comfort to you, I have one that does the same thing. Old
> > Calvin does not like bzimage at all. I have linux running on 4 systems
> > here, only the one does that. Does yours do that with only 2.0.33 or with
> > any kernel?
>
> Is your Lilo new enough to know about bzImage ? - There are also a few
> laptops at least where bzImage might fail due to cache coherency bugs across
> the A20 line toggle
>

Are you SURE it is a matter of cache coherency? All CPUs 486 and
newer apply A20 already before hitting the L1 cache. More likely is
that whatever is toggling the A20 line isn't pausing long enough after
toggling it; I found when I changed SYSLINUX to do its own
protected-mode bcopy that a loop with 20 I/O operations in it appears
to be required; I found this tip on http://www.x86.org/.

-hpa

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