aic-5.1.19 AHA-3985W

[Michael Leodolter]

On Mon, 20 Sep 1999, Doug Ledford wrote:

> Michael Leodolter wrote:
> > 
> > -----BEGIN PGP SIGNED MESSAGE-----
> > 
> > Hi Doug!
> > 
> > We have a Adaptec 3985W (PCI_DEVICE_ID_ADAPTEC_7873) board with 9 4.5Gb
> > disks, 3 on each channel -
> > and were still running linux-2.0.33/aic7xxx-4.1.1 -
> > 
> > Now did upgrade to 2.2.12 with aic7xxx-5.1.19:
> > After lots of problems I looked into the old driver from 2.0.33 and saw:
> > 
> > The external SCB RAM on the 3985W does not work and was disabled by
> > #ifdef AIC7XXX_USE_EXT_SCBRAM.
> > 
> > With the following patch to linux-2.2.12/aic7xxx.c-5.1.19 everything works
> > fine.
> > 
> > Maybe this is needed only for
> >         temp_p->device_id == PCI_DEVICE_ID_ADAPTEC_7873.
> > 
> > - --- cut here ---
> > - --- aic7xxx.c.orig    Mon Sep 13 10:13:58 1999
> > +++ aic7xxx.c   Mon Sep 13 14:26:47 1999
> > @@ -9966,12 +9966,14 @@
> >                    devconfig |= EXTSCBPEN;
> >                  }
> >                }
> > +#ifdef AIC7XXX_USE_EXT_SCBRAM
> >                else if (devconfig & RAMPSM)
> >                {
> >                  devconfig &= ~SCBRAMSEL;
> >                  devconfig |= EXTSCBPEN;
> >                  temp_p->flags |= AHC_EXTERNAL_SRAM;
> >                }
> > +#endif
> >  #if LINUX_VERSION_CODE > KERNEL_VERSION(2,1,92)
> >                pci_write_config_dword(pdev, DEVCONFIG, devconfig);
> >  #else
> 
> 
> Hmmm....a 3985W that uses the 7883 device ID should never get there.  The
You are right! (it's a 7873 on a 3985W - and never gets there !!!).
> switch statement that enloses that code says:
> 
>           switch(temp_p->chip & AHC_CHIPID_MASK)
>           {
>             default:
>               break;
>             case AHC_AIC7895:
>             case AHC_AIC7896:
>             case AHC_AIC7899:
> 		.....
> 	  }
> 
> So, as you can see, the change you made shouldn't make a difference.  Now, if
> you have one of the later model 3985 cards that uses the 7895 chipset, then
> this all makes perfect sense.  In any case, I've modified the current driver
> with the following:
> 
> /*
>  * On some machines, enabling the external SCB RAM isn't reliable yet.  I
>  * haven't had time to make test patches for things like changing the
>  * timing mode on that external RAM either.  Some of those changes may
>  * fix the problem.  Until then though, we default to external SCB RAM
>  * off and give a command line option to enable it.
>  */
> static int aic7xxx_scbram = 0;
Please revert !
> 
> 
> and I modified the code inside the switch statement to honor this global
> variable that the setup code can modify.  That should solve your problem and
> will be in the next official release.
Sorry! 
Our problem was solved by setting

CONFIG_AIC7XXX_CMDS_PER_DEVICE=8

in the kernel .config file.
 
(we have 4 3year old Quantum XP34300W (Atlas I 4.5Gb) disks)

	michael
--------------------------------------------------------
-  Michael Leodolter         Brain Research Lab (BRL)  -
-  Inst. of Psychology                Univ. of Vienna  -
-  EMail:       Michael.Leodolter at univie.ac.at	       -
-  Tel: ++43-1-4277-478-28   Fax: ++43-1-4277-478-59   -	
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