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Re: ATA-100 Issues

So heres a question.  
Let's say I can't make it stop freaking out at UDMA mode 5.

Instead of it dropping to mode 2 (sucky), why can't it drop to mode 4 ?

I think I see a way to "hack" this behavior (sort of)

from src/sys/dev/pci/pciide.c 
(in function pdc202xx_chip_map)

	sc->sc_wdcdev.UDMA_cap = 5;

im assuming that this is telling pciide that if it finds a 265 chipset, to run
UDMA mode 5.  If i change that 5 to 4, will pciide start the controller up in 
UDMA mode 4 (and hopefully not get errors at this setting, thus avoiding a 
fallback to mode 2) or is the mode setting busines above just for the pretty
informational messages i see in the debugging logs ?

Comments ?

On Wed, Jul 25, 2001 at 02:43:15AM -0700, Matt Evans wrote:
> On a fresh (3 hour old) install of 2.9 i386 generic:
> I am having lots of CRC errors now that I have two ATA-100 drives
> on the same chain.  I just bought a brand new 40gb IBM ata-100 disk to add
> to the chain with my 30gb ata-100 disk (also IBM).  
> wd0(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 2
> wd1(pciide1:0:1): using PIO mode 4, Ultra-DMA mode 2
> wd0a:  aborted command, interface CRC error writing fsbn 43005664 of 43005664-43005791 (wd0 bn 43267744; cn 42924 tn 5 sn 37), retrying
> wd0: soft error (corrected)

Matt Evans     email: matt_(_at_)_mattevans_(_dot_)_org      web: www.mattevans.org