[parisc-linux] Status report - B132L and 725/100

[Richard Hirst]

On Wed, Dec 19, 2001 at 01:40:48PM -0700, Grant Grundler wrote:
> "Andy Walker" wrote:
> > by the 53c8xx driver, it says differential on the external connector -
> > there can't be any doubt, can there? This should all work together.
> 
> It sounds like it should all just work. Especially if HPUX works.
> But HPUX sometimes cripples the bus speed or *wideth* based
> on what PDC tells it. Perhaps you need to do the same. I really
> don't expect any issues with bus speed on differential SCSIs.
> Possibly a wide vs narrow bus issue (Chip thinks it's wide and the cabling
> is narrow). We see that on C3k still and I started (but didn't finish)
> the code to query PDC about Host SCSI ID, bus speed, and width.
> 
> > Anyway, I'll take an known good disk with me tomorrow and try that with
> > a different internal cable. I'll also double check that everything is
> > still working with HP-UX. More news as it breaks.........
> 
> Yeah - if HPUX boots/talks to the devices, they are basically ok.
> It's a matter of getting the linux driver the right parameters then.

>From drivers/scsi/README.ncr53c8xx, you can force narrow by booting with

ncr53c8xx=wide:0

and disable tagged commands with

ncr53c8xx=wide:0,tags:0

and force async with

ncr53c8xx=wide:0,tags:0,sync:255

and disable dma burst with

ncr53c8xx=wide:0,tags:0,sync:255,busrt:0

and disable disconnect with

ncr53c8xx=wide:0,tags:0,sync:255,burst:0,disc:n


Richard