[U-Boot-Users] PCI MEM I/O space allocation

York Sun yorksun at freescale.com
Tue Jan 9 17:06:00 CET 2007

On Tue, 2007-01-09 at 16:48 +0100, Wolfgang Denk wrote:
> > There isn't one. I mean back to kernel's way. Why should U-boot use
> > different way from kernel to allocate resources since most PCI parts are
> > similar (equivalent) to kernel?
> This is not a change "back" then, as we never used this setup before.
> > Yes, I know. Hopefully  not too much. This change will only change the
> I think such a change affects about 128 boards...
> *ALL* of these need thorough regression testing after such a
> significant change.
> I wouldn't do this lightly...

All right. I will do it in my branch and not to submit patch for this.

> > allocation direction. Once U-boot has same algorithm with kernel, it is
> > easier to maintain in the future.
> What exactly is the problem you're trying to fix? The fact that it's
> different is IMHO not enough of a reason to change it.

The problem is some bridges have 64K limitation on I/O space, which
requires special care in allocation. I am fixing it in the kernel.



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