[coreboot] [PATCH] v3 Resource allocator to v2

Myles Watson mylesgw at gmail.com
Thu May 28 21:00:02 CEST 2009

> It's basically really just a fixed address memory space of a certain fixed
> size that needs to be kept free by the resource allocator, very similar to
> the way it needs to be done for the IOAPIC and Local APIC.
Great.  That makes it easy.

> Since the PCIe BAR is part of the northbridge, I tried to tell the resource
> allocator to do this in the northbridge.c code, but I couldn't seem to
> figure out a way to make the (old) allocator honor it.
There was no check for fixed resources before.  There was a #warning
in compute_allocate_resources about it.  It just set the limits below
0xfec00000, and as long as your fixed resources were above that you
were fine.

The gotcha here is that I haven't implemented fixed resources in the
middle of the rest of the PCI memory address space.  If you declare a
fixed region 0xf4000000-0xf4000007 you can no longer use
0xf4000008-0xfec00000.  All of the PCI BARs have to fit on one side
(above or below) the fixed regions.

I don't think that's much of an issue, but it is there.


More information about the coreboot mailing list