The system's PCI bridge is broken, MEM Mapped IO does not work.
Only we can use IO mapped IO to access PCI devices(inb, outb) those are
behind the bridge.
I am looking for a LSI mega raid adapter (SCSI, SATA or SAS) that
supports IO mapped IO and has a linux driver for it.
On Mon, 2005-05-02 at 05:56, Ju, Seokmann wrote:
> On Saturday, April 30, 2005 9:02 PM, Kallol wrote:
> > The memory space PCI register access can not be used.
> I'm not sure what this means. Can you please add more details on it?
>
> > Question #1: Does 320-4X support IO Space device register access?
> No, the controller does not support IO mapped I/O.
>
> > Question #2: Do we have a linux driver for it that supports
> > IO ports also?
> Yes, to support LSI MegaRAID controllers (typically old controllers), driver
> on the 2.4 kernel supports I/O mapped I/O.
>
> Thank you.
>
> Seokmann
> LSI Logic Corporation.
>
> > -----Original Message-----
> > From: [email protected] [mailto:[email protected]]
> > Sent: Saturday, April 30, 2005 9:02 PM
> > To: [email protected]; [email protected]
> > Subject: LSI Logic's Ultra320 320-4X RAID adapter
> >
> >
> >
> > Hello,
> > We have been evaluting different IO adapters for a
> > storage system vendor.
> >
> > LSI logic's 320-4X RAID controller seems to be a good choice.
> >
> > There is an issue with the system on which we are measuring
> > performance.
> > The memory space PCI register access can not be used.
> >
> > Question #1: Does 320-4X support IO Space device register access?
> > Question #2: Do we have a linux driver for it that supports
> > IO ports also?
> >
> > The megaraid linux driver seems to check the BAR0, if it is
> > memory bar then mem
> > space is used otherwise IO space.
> >
> > May be the adapter supporting memory space also support IO
> > space access.
> >
> >
> > Thanks,
> > Kallol
> > -
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