PCI IDE Controller Base Address Register setting

[Alexander Motin]

Darmawan Salihun wrote:
> I get the following log message upon booting with "boot -Dv":
> ==============================
> ata0: <ATA channel 0> on atapci0
> ata0: reset tp1 mask=03 ostat0=50 ostat1=50
> ata0: stat0=0x80 err=0x00 lsb=0x00 msb=0x00
> ata0: stat0=0x50 err=0x01 lsb=0x00 msb=0x00
> ata0: stat1=0x50 err=0x01 lsb=0x00 msb=0x00
> ata0: reset tp2 stat0=50 stat1=50 devices=0x3
> ...
> ata0: Identifying devices: 00000003
> ata0: New devices: 00000003
> ...
> ata0-slave: pio=PIO4 wdma=WDMA2 udma=UDMA100 cable=80 wire
> ata0-master: pio=PIO1 wdma=UNSUPPORTED udma=UNSUPPORTED cable=40 wire
> ...
> ad0: FAILURE setting PIO1 on CS5536 chip
> ad0: 488MB <STI Flash 6.2.0 Rev 6.2.0> at ata0-master BIOSPIO
> ...
> GEOM: newdisk ad0
> ad0: Adaptec check1 failed
> ad0: LSI(v3) check1 failed
> ad0: FAILURE - READ status=51<READY,DSC,ERROR> error=c4<ICRC,UNCORRECTABLE,ABORTED> LBA=0
> ...
> ad1: setting PIO4 on CS5536 chip
> ad1: setting UDMA100 on CS5536 chip
> ad1: 38150MB <Seagate ST340014A 3.06> at ata0-slave UDMA100
> ...
> GEOM: newdisk ad1
> ...
> ad1: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=84<ICRC,ABORTED> LBA=78132575
> ad1: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=84<ICRC,ABORTED> LBA=78132591
> ...
> ======================
> I have several questions: 
> 1. How FreeBSD sets the PIO mode on the target IDE controller? 
> what could've caused it to fail like the message above?

Looking to your messages I would suggest you are running something like
FreeBSD 8.0. At that time controller-specific method first set mode on
device and then programmed the chip. Most likely this error returned by
device. Some very old devices not supporting more then PIO3 may not
support mode setting command.

Mode setting code was significantly rewritten between 8.0 and 8.1. I
would recommend you to take newer version of FreeBSD for experiments.

> 2. It seems to me that setting the UDMA100 in the 
> AMD CS5536 IDE controller went just fine (in the log above). 
> But, FreeBSD fails when it tries to read something from the drive. 
> Does it mean the UDMA100 "mode" failed to be set correctly 
> in the IDE controller? 

It can be. For UDMA transfer rate is driven by transmitting side (for
reading - by device), but there is always a chance to do something
wrong. :) I don't have CS5536 board, so can't be completely sure how
correct is the code.

> 3. As I'm currently trying to fix the bug in the BIOS for the particular 
> board used to boot FreeBSD, what would you suggest to fix it? 

Try latest FreeBSD -- 8.2 is now in RC state.
Try to disconnect devices one by one.
Try to limit initial mode via loader tunables (note that some of them
were added not so long ago and may be missing on 8.0).

-- 
Alexander Motin