From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt To: Geert Uytterhoeven , Subject: Re: xf 4.0.1 with rage II/rage pro -- multi-headed display! Date: Wed, 27 Sep 2000 19:22:30 +0200 Message-Id: <19340822105414.6793@mailhost.mipsys.com> In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: >> One thing: I'd be interested in figuring out what happens if you simply >> leave this nasty ATI BAR unassigned (write 0xffffffff and then 0 to it). >> Will the controller fail ? > >Well, according to Matt Porter, 0 is a valid address in PCI 2.2. So how do you >disable BARs for PCI 2.2-compliant devices? > >And I'm afraid what XFree86 4.x will do with BARs set to 0. Probably it will >try to relocate them. I guess that's how it crashes on my box with an >unitialized S3... Well, I may be wrong here, but the cause of our problem (the MMIO BAR overlapping the framebuffer BAR causing XFree to bark) may also be an XFree problem. I think we never completely figured out if what MacOS does to the chip is valid or not (because of priority-decoding). Ben. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/