Re: [coreboot] MPTable can not be high-memory on Linux

[Ingo Molnar]

* Yinghai Lu  wrote:
> Ingo Molnar wrote:
> > Kevin O'Connor  wrote:
> > > On Sun, Feb 22, 2009 at 01:33:35PM -0800, Yinghai Lu wrote:
> > > [...]
> > > > > > >  BIOS-e820: 0000000000090000 - 0000000000100000 (reserved)
> > > > > > >  BIOS-e820: 0000000000100000 - 000000003f7f0000 (usable)
> > > > > > >  BIOS-e820: 000000003f7f0000 - 0000000040000000 (reserved)
> > >
> > > [...]
> > > > > > > found SMP MP-table at [c00f9fc0] 000f9fc0
> > >
> > > [...]
> > > > that should work for a long time.
> > > >
> > > > 0xf9fc0 < 1M is quite < max_low_pfn, so wonder why bootmem could panic.
> > >
> > > On this machine the mptable "floating" structure is at 
> > > 0xf9fc0.  It points to the rest of the table which is in the 
> > > 0x3f7f0000 area.
> > >
> > > Note, that this is on a Coreboot+SeaBIOS machine - so we can 
> > > change the bios.  However, the mptable spec does allow for 
> > > part of the table to be high memory.
> >
> > yes, and i'd prefer if it worked fine even if it's that high.
>
> please check
>
> [PATCH] x86: check physptr with max_low_pfn on 32bit

Applied to tip:x86/apic, thanks Yinghai!

This will show up in v2.6.30. I suspect Coreboot will be changed 
anyway (older Linux kernels may crash), but it's worth having 
this bug fixed nevertheless.

Ingo