Re: [PATCH] SCSI midlayer power management

Pavel Machek
2004-08-12T13:15:45Z

Hi!

> > Some hosts will continuously DMA to memory iirc.. I remember having a
> > problem with 53c8xx on some macs when transitionning from MacOS to Linux
> > because of that.
>
> I think you're thinking of the scripts engine? on pre 53c875 chips,
> yes, this is true. The on-board processor is executing instructions
> from host memory. However, this is read only in quiescent (waiting for
> host connect or target reconnect) mode, so shouldn't be a problem for
> suspend. On the 875 and later, we host the scripts in on-chip memory so
> they shouldn't be troubling main memory when idling.

Even read-only access could hurt.... That DMA engine is going to get
very unhappy if we change data from under it, right?

Pavel
--
People were complaining that M$ turns users into beta-testers...
...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!