Re: Claim on IEEE1275

[Hollis Blanchard]

On Jan 1, 2005, at 2:49 PM, Hollis Blanchard wrote:
> I've tested this patch (attached to prevent line-wrapping) on the 
> briQ, but there's some other problem (not caused by the patch) that 
> hangs after "boot". I'm not going to test Old World now, as there are 
> some more fundamental problems there.

It has been pointed out to me that a simpler fix would just be to 
ignore map failures. That sounds better to me... we *are* supposed to 
use map, but the first 32 MB or so are probably already mapped anyways 
on most systems.

Likely the error occurs because "map" is meaningless in real-mode, and 
Codegen chose to return an error in this case. I was told an 
implementation in real-mode *may* provide an mmu node, so things seem 
rather open-ended in this situation.

The patch I sent earlier may get us into trouble if we want to load 
things on New World that happen to fall outside the already-mapped 
region (like large ramdisks). I think a better plan would be:
1) only call map in virtual mode
2) *and* ignore map errors. We could report them as warnings in a 
verbose mode for remote debugging.

-Hollis