From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from kunk.qbjnet.com (ddsl1-28.ddsl.mr.net [137.192.135.28]) by ozlabs.org (Postfix) with SMTP id 424D2DDDED for ; Fri, 12 Jan 2007 15:42:16 +1100 (EST) Date: 12 Jan 2007 04:42:13 -0000 Message-ID: <20070112044213.27744.qmail@kunk.qbjnet.com> From: Bob Brose To: linuxppc-dev@ozlabs.org Subject: Re: Problems with devices that use PCI shared memory on 2nd PCI bus (6 slot powermac) List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Ben Wrote: > On Wed, 2007-01-10 at 15:05 +0000, Bob Brose wrote: > > Since Ben fixed the irq routing on 32 bit powermacs with changes to pci_32.c > > and prom_parse.c I've been able to use all 6 slots with interrupt > > driven devices however there appears to be a problem with devices that use > > memory mapping. (this is on a S900 w/ 21052 second PCI controller) > > > > A couple of examples: > > When using a 21143 tulip ethernet card on the second PCI bus and with the > > "Use PCI shared mem for NIC registers" option turned on the driver > > fails with incorrect status register reads. If I compile a kernel without > > this option it works fine. > > > > Also, if I put a rage 128 video board in one of the slots on the > > second bus it cannot do DRM. If I turn DRM off it works ok or if I move the > > card to the first bus it works fine with DRM. > > In lspci -vv, do you see the BusMaster bit enabled on the PCI-2-PCI > bridge ? > > Ben. Yes. Here is the lspci -vv for the 21052: 00:0f.0 PCI bridge: Digital Equipment Corporation DECchip 21052 (rev 01) (prog-if 00 [Normal decode]) Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- SERR- TAbort- Reset- FastB2B- Bob