Hi. With latest 5-current kernel, it will always panic. My HDD does not support DMA mode. So with old kernel(maybe before sos's latest ata changes), it fallback to PIO mode(see attached text). Do only I have this problem? Thank you. --- MIHIRA, Sanpei Yoshiro Yokohama, Japan. ===== latest 5-current ==== atapci0: <Generic PCI ATA controller> port 0xfcf0-0xfcff at device 20.0 on pci0ata0: at 0x1f0 irq 14 on atapci0 <<snip>> ad0: 4645MB <IBM-DBCA-204860> [10068/15/63] at ata0-master using WDMA2 Mounting root from ufs:/dev/ad0s3c ad0: READ command timeout - resetting ata0: resetting devices .. Fatal trap 12: page fault while in kernel mode fault virtual address = 0x70 fault code = supervisor read, page not present instruction pointer = 0x8:0xc01631a4 stack pointer = 0x10:0xc02b4e1c frame pointer = 0x10:0xc02b4e40 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, def32 1, gran 1 processor eflags = interrupt enabled, resume, IOPL = 0 current process = Idle interrupt mask = net tty bio cam trap number = 12 panic: page fault syncing disks... ========== ===== old 5-current kernel === ad0: 4645MB <IBM-DBCA-204860> [10068/15/63] at ata0-master using WDMA2 Mounting root from ufs:/dev/ad0s3c pccard: card inserted, slot 0 ad0: READ command timeout - resetting ata0: resetting devices .. done ad0: READ command timeout - resetting ata0: resetting devices .. done ad0: READ command timeout - resetting ata0: resetting devices .. done ad0: READ command timeout - resetting ata0-master: WARNING: WAIT_READY active=ATA_ACTIVE_ATA ad0: trying fallback to PIO mode ata0: resetting devices .. done ========== To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message