Hi, Sounds like he's got the same chipset as I do. Same symptoms, see:
http://www.freebsd.org/cgi/query-pr.cgi?pr=40003 It took me a while but I got a trace with Julian and DES's help, it's attached to the pr now. In one of the past threads on this, there's this response: ----- (kgdb) p adp $2 = (struct ad_softc *) 0x68c040 (kgdb) p atadev $3 = (struct ata_device *) 0xc075b650 (kgdb) p *adp Cannot access memory at address 0x68c040. (kgdb) p *atadev $4 = {channel = 0xc075b600, unit = 16, name = 0xc04503b0 "ad1", param = 0x0, driver = 0x0, flags = 0, mode = 0, cmd = 0, result = 0x0} ad_attach() is trying to dereference atadev->param, which is NULL. ----- I'm still set up with remote gdb ready to go if you need any other info. I also used to get the "falling back to PIO" delays/resets, regardless of whether I turn off dma in loader.conf. Thanks, Charles -- Charles Sprickman [EMAIL PROTECTED] On Fri, 2 Aug 2002, Soeren Schmidt wrote: > It seems Martin Blapp wrote: > > We get repeatable panics on a old machine, where a ATA > > disk seems to have problems. > > > > It works fine on 4.4 (beside some timeout messages), > > panics reproducable at startup every time at the same > > place. > > > > With 4.4 we got: > > > > ad0: READ command timeout tag=0 serv=0 - resetting > > ata0: resetting devices .. done > > ad0: READ command timeout tag=0 serv=0 - resetting > > ata0: resetting devices .. done > > ad0: READ command timeout tag=0 serv=0 - resetting > > ata0: resetting devices .. done > > ad0: READ command timeout tag=0 serv=0 - resetting > > ad0: trying fallback to PIO mode > > ata0: resetting devices .. done > > > > Everything worked. Now, after a upgrade to 4.6 STABLE > > we get a panic after "ad0: trying fallback to PIO mode". > > dmesg ? !?! > > > Set the device in BIOS to PIO mode doesn't help too. > > That changes nothing at all.. > > Maybe you could disable DMA from the loader, does it work then ? > > -Søren > > To Unsubscribe: send mail to [EMAIL PROTECTED] > with "unsubscribe freebsd-stable" in the body of the message > > To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-stable" in the body of the message
