Vladimir Kushnir wrote: > Setup: Fujitsu MPG3409AT E disk on external CMD649 controller (the only > HD). Kernel trap while booting with timeout for ad0 device. Setting > "hw.ata.ata_dma=0" solves the problem. Sources last cvsupped last night > (after the last ATA-related commits). Dmesg output attached, but that's > about all I can provide - no serial console here.
This is probably related to the inverted sense-test that was recently fixed. FWIW: the CMD640 series of chips is well known to mung DMA, if an interrupt occurs during a transfer. I can't say for certain that the CMD649 has this problem, so you might want to look at the vendor errata for the chips. Personally, I avoid the CMD64x controllers entirely, so as to avoid getting a bad one, since I have no idea if there is actually a good one in existance. 8-(. -- Terry To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
