> I didn't believe that you'd have 320MB just because it's such an odd
> number, but the problem is that Linux apparently starts allocating the PCI
> address space just _under_ the 320MB mark (you probably have some memory
> reserved for ACPI that doesn't show up in the e820 memory map).
Jeff, are you using the e820 memory map at all ? In particular, are you
using grub or some other buggy bootloader that insists on specifying a
mem= option on the kernel command line ? There should be a kernel command
line message very early on, what does that say ?
Also, can you give us the E820 memory map (kernel messages starting with
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