Messages in this thread |  | | Date | Fri, 2 Nov 2001 08:20:21 +0000 | From | Pavel Machek <> | Subject | Re: Boot failure in 2.5.31 BK with new TLS patch |
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Hi!
> > The boot problem only happens with my quad pentium cards, the dyad > > pentium and 486 are fine. Originally, a voyager system with quad cards > > just wouldn't boot (this was in the 2.2.x days). Eventually, by trial > > and error and long debug of the boot process I discovered it would boot > > if the GDT was 8 bytes aligned (actually, the manuals say it should be > > 16 byte aligned, so perhaps we should also add this to the Linux > > setup.S?). [...] > > indeed it's not aligned: > > c010025c T cpu_gdt_descr > > could you align it by adding this line replacing the ALIGN line that > preceeds the cpu_gdt_descr definition in head.S: > > .align 32 > > we want to align the GDT to 32 bytes anyway, we have optimized it for > cache layout, and didnt realize that it wasnt aligned to begin with ...
You might want to .align L1_CACHE_SIZE (or something), IIRC P4s have bigger cachelines than 32. Pave -- Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt, details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
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