Date: Sat, 20 Jan 2001 16:18:35 +0100 From: Nicolas Souchu <nsouch@alcove.fr> To: freebsd-hackers@freebsd.org Subject: odd result of pci_read_config Message-ID: <20010120161834.B20753@ontario.alcove-int>
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Hi folks, I have a problem with R4.2. The device driver I'm currently writing can't retrieve correctly the value from a PCI configuration register. What is strange is that when using the pciconf tool I get the result I expect, not with pci_read_config(). pciconf -r pci0:7:3: 0x48 returns 0x00006001 but value = pci_read_config(dev, 0x48, 4); returns 0x6 !!! The later is called from the attach routine of the driver which is detected like this: viapm0: <VIA VT82C586B Power Management Unit> at device 7.3 on pci0 My pci config is: chip0@pci0:0:0: class=0x060000 card=0x00000000 chip=0x05971106 rev=0x04 hdr=0x00 pcib1@pci0:1:0: class=0x060400 card=0x00000000 chip=0x85981106 rev=0x00 hdr=0x01 isab0@pci0:7:0: class=0x060100 card=0x00000000 chip=0x05861106 rev=0x47 hdr=0x00 atapci0@pci0:7:1: class=0x01018a card=0x00000000 chip=0x05711106 rev=0x06 hdr=0x00 viapm0@pci0:7:3: class=0x060400 card=0x00000000 chip=0x30401106 rev=0x10 hdr=0x01 pcm0@pci0:8:0: class=0x040100 card=0x13191319 chip=0x08011319 rev=0xb1 hdr=0x00 none0@pci0:8:1: class=0x090410 card=0x13191319 chip=0x08021319 rev=0xb1 hdr=0x00 ahc0@pci0:9:0: class=0x010000 card=0x00000000 chip=0x81789004 rev=0x00 hdr=0x00 fxp0@pci0:10:0: class=0x020000 card=0x10c3103c chip=0x12298086 rev=0x05 hdr=0x00 none1@pci1:0:0: class=0x030000 card=0x00281002 chip=0x52461002 rev=0x00 hdr=0x00 So what may be the problem? Also, some PCI drivers allocate IOPORT resources by giving the PCI configuration register as the rid of the bus_alloc_resource call... how can it work? What are the magics in pci framework for this? Thanks, Nicholas -- Nicolas.Souchu@alcove.fr Alcôve - Open Source Software Engineer - http://www.alcove.fr To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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