One of my machines is an Intel 815EP chipset box with
an 82801BA IDE controller (8086:244b rev 05) and two
ATAPI devices on the second channel (the boot disk is
connected to a PDC20269).
With 2.6.29-rc1 this machine hangs hard during boot, when
init starts udev. There are no messages on the console and
not even sysrq gets any reaction.
Reverting the 2.6.29-rc1 change which made ata_piix inherit
the bmdma32 port ops makes the machine boot ok again. (Patch below.)
I'm guessing the 32-bit I/O stuff doesn't work on this controller
or these ATAPI devices.
Partial dmesg from 2.6.29-rc1 with the bmdma32 change reverted:
ata_piix 0000:00:1f.1: version 2.12
ata_piix 0000:00:1f.1: setting latency timer to 64
scsi0 : ata_piix
scsi1 : ata_piix
ata1: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0xf000 irq 14
ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xf008 irq 15
ata2.00: ATAPI: CRD-8320B, 1.12, max MWDMA2
ata2.01: ATAPI: Hewlett-Packard CD-Writer Plus 9100, 1.0c, max UDMA/33
ata2.00: configured for MWDMA2
ata2.01: configured for UDMA/33
scsi 1:0:0:0: CD-ROM GoldStar CD-ROM CRD-8320B 1.12 PQ: 0 ANSI: 5
scsi 1:0:1:0: CD-ROM HP CD-Writer+ 9100 1.0c PQ: 0 ANSI: 5
/Mikael
--- linux-2.6.29-rc1/drivers/ata/ata_piix.c.~1~ 2009-01-13 23:35:23.000000000 +0100
+++ linux-2.6.29-rc1/drivers/ata/ata_piix.c 2009-01-14 22:57:37.000000000 +0100
@@ -310,7 +310,7 @@ static struct scsi_host_template piix_sh
};
static struct ata_port_operations piix_pata_ops = {
- .inherits = &ata_bmdma32_port_ops,
+ .inherits = &ata_bmdma_port_ops,
.cable_detect = ata_cable_40wire,
.set_piomode = piix_set_piomode,
.set_dmamode = piix_set_dmamode,
--
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