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SubjectRe: ATA/133 Problems with multiple cards
Hi,

On Sun, 17 Oct 2004 03:51:36 +0100 (BST), James Stevenson
<james@stev.org> wrote:
>
> Hi,
>
> i did actually kind of get the card's working together but ran into
> another problem.
>
> when i boot with ide=nodma and then turn on dma manually on all the other
> cards / board chipset etc... they all function fine
>
> then i can only turn the dma up to ATA/100 if i set it to ata/133 it will
> cause the errors. I assume this is something todo with the promise bois
> not setting up the 3rd card at boot time. It only shows drive listing for
> 2 of the 3 cards.

There were very similar problems reported in the past and they were
fixed by replacing power supply with a better one.

Also you shouldn't need to use "ide=nodma" and play with hdparm,
driver should tune the best mode available. If this doesn't work then
something needs fixing.

You can find out if BIOS/driver configures cards correctly by
comparing PCI config space (lspci -xxx) for working/non-working
controller.

> Unfortunatly this generated another problem.
> When read from both drives at the same time it functions normally and
> see resonable performance. When i attempt to write to both drives it will
> cause the machine to lockup.
>
> James
>
>
>
> On Thu, 14 Oct 2004, Bartlomiej Zolnierkiewicz wrote:
>
> > On Thu, 14 Oct 2004 13:12:42 -0500, Ian Pilcher <i.pilcher@comcast.net> wrote:
> > > James Stevenson wrote:
> > > >
> > > > i seem to have run into an annoying problem with a machine which has
> > > > 3 promise ata/133 card the PDC20269 type.
> > > >
> > >
> > > ....
> > >
> > > >
> > > > Does anyone have an explenation of why this can happen ?
> >
> > * check power supply
> > * compare PCI config space of the "failing" controller to the one which
> > is "working" (assuming that identical devices are connected to each),
> > maybe firmware/driver forgets to setup some settings
> >
> > > Promise cards don't support more than two per machine. If you can get a
> > > third card to work in PIO mode, consider it an added (but unsupported)
> > > bonus.
> >
> > AFAIR people have been running 4-5 cards just fine
> > -
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>
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