New to FreeBSD 4.9 questions about configuration

[Roman Neuhauser]

# larrykh465 at SoftHome.net / 2004-01-10 15:12:42 -0800:
> On Friday 09 January 2004 03:42 pm, you wrote:
> > # larrykh465 at SoftHome.net / 2004-01-09 12:57:26 -0800:
> > > Mounting root from ufs:/dev/ad0s2a
> > > ad0s2a: UDMA ICRC error writing fsbn 42387790 of 4160-4163 (ad0s2 bn
> > > 42387790; cn 2638 tn 132 sn 4) retrying
> > > ad0s2a: UDMA ICRC error writing fsbn 42387790 of 4160-4163 (ad0s2 bn
> > > 42387790; cn 2638 tn 132 sn 4) retrying
> > > ad0s2a: UDMA ICRC error writing fsbn 42387790 of 4160-4163 (ad0s2 bn
> > > 42387790; cn 2638 tn 132 sn 4) retrying
> > > ad0s2a: UDMA ICRC error writing fsbn 42379502 of 16-19 (ad0s2 bn
> > > 42379502; cn 2638 tn 0 sn 32) retrying
> > > ad0s2a: UDMA ICRC error writing fsbn 42379502 of 16-19 (ad0s2 bn
> > > 42379502; cn 2638 tn 0 sn 32) retrying
> > > ad0s2a: UDMA ICRC error writing fsbn 42379502 of 16-19 (ad0s2 bn
> > > 42379502; cn 2638 tn 0 sn 32) retrying
> > > ad0s2a: UDMA ICRC error writing fsbn 42379502 of 16-19 (ad0s2 bn
> > > 42379502; cn 2638 tn 0 sn 32) falling back to PIO mode
> > > in bois the hard drives pio mode is set to auto I have the options of
> > > auto,and pio mode 1-5, I have tried to play with this abit but no
> > > diference how do I either make the hard drive work with the udma mode
> > > or configure the kernal to stay at pio mode in the first place?
> >
> >     this error has several possible reasons, one of them being a crappy
> >     cable:
> >    
> > http://lists.freebsd.org/pipermail/freebsd-questions/2003-November/025669.html

> after checking the cable to the hard drive it was the 80 wire 40 pin, in good 
> shape
> 
> I pulled everything but the hard drive and booted, it fixed it, the cdrom that 
> I had setup as the slave on the ide0 bus seems to be conflicting, so I set up 
> the cdrom and zip on the second bus and marked the ide0 slave as "not 
> installed" in bios.
> The UDMA ICRC errorer is gone and I now have UDMA 100 everything related to 
> storage  works well now :>)

    aha. speed of both devices on the same cable is limited to the speed
    of the slowest device, IOW a hard disk (normally UDMA) + CDROM
    (normally PIO) on one disk means both run in PIO. I'm not sure
    wheter the ATA code could handle this more gracefully...

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