> To: video4linux-list@xxxxxxxxxx > Subject: system hang in bttv driver on > modprobe. PCI problem? > > > I hope someone can point me in the direction of > some help. The problem > is easy to reproduce, but I have no error > messages, just the system > locks up solid (no oops!) I have SGI KDB > installed and functional but it > does not come up when the hang occurs either. > > Versions: > started with redhat 7.3 standard kernel > (2.4.18++, with bttv 0.7.xxx) > then tried 2.4.19 linus tree with v4l2 & > bttv-0.8.45... no change. > > I started editing the bttv driver. and noticed > that it hangs in the file > bttv-driver.c in the init_bt848 routine at the > line which does > "btwrite(val,BT848_E_SCLOOP);" If I comment > out the line, it will hang > on the next line, If I comment that one, it > will hang on the one after > that, etc... > > These lines to write to registers on the ATI TV > Wonder Card (PCI id > 00:09.0 which has a BT878A chip on it.) It > seems able to do a couple of > writes and then hang. > > grumpy% lspci > 00:00.0 Host bridge: VIA Technologies, Inc. > VT82C693A/694x [Apollo > PRO133x] (rev c2) > 00:01.0 PCI bridge: VIA Technologies, Inc. > VT82C598/694x [Apollo > MVP3/Pro133x AGP] > 00:04.0 ISA bridge: VIA Technologies, Inc. > VT82C596 ISA [Mobile South] > (rev 12) > 00:04.1 IDE interface: VIA Technologies, Inc. > Bus Master IDE (rev 06) > 00:04.2 USB Controller: VIA Technologies, Inc. > USB (rev 08) > 00:04.3 Host bridge: VIA Technologies, Inc. > VT82C596 Power Management > (rev 20) > 00:09.0 Multimedia video controller: Brooktree > Corporation Bt878 Video > Capture (rev 11) > 00:09.1 Multimedia controller: Brooktree > Corporation Bt878 Audio Capture > (rev 11) > 00:0b.0 Multimedia audio controller: Creative > Labs SB Live! EMU10k1 (rev 08) > 00:0b.1 Input device controller: Creative Labs > SB Live! MIDI/Game Port > (rev 08) > 00:0e.0 Ethernet controller: 3Com Corporation > 3c905B 100BaseTX [Cyclone] > (rev 30) > 01:00.0 VGA compatible controller: Matrox > Graphics, Inc. MGA G400 AGP > (rev 04) > grumpy% > > I would appreciate any ideas on how to proceed, > or pointers to people > who might be willing to help. > The O_SCLOOP register is just setting the video filter that it will use for Automatic Gain Control and Horizontal (line) filtering. Since you probably do not have video turned on yet, I would not suspect it yet. If you are using .8.45 the only thing that happens before in the init function and is possible suspicious is the setting of the DMA bits for the DMA controller. That is what I would try to comment out, or in the very least move it down further below to see if it changes things .. Also .. in the generic startup code up there, do you see any error messages like "Oops .. no DMA found .." or things like that ? PS: I have very much the same setup as you .. except for a trident gfx card and used to have some hangs (after a while of running though). Then I switched to the 0.8 series of the driver and 2.4.19 .. now I am crash-free ..but I never investigated the problem on the old one. PPS: How do you know it is an 878A ? the pci parameters do not actually specify it .. and I get the same message as you do, but assumed that it was the 878 not the 878A .. Thanx __________________________________________________ Do you Yahoo!? New DSL Internet Access from SBC & Yahoo! http://sbc.yahoo.com
