Re: tried ia64-net-20020506.iso, (rx4610) failed with map_single IO TLB kernel panic...

[David Mosberger <davidm@napali.hpl.hp.com>]

>>>>> On Thu, 16 May 2002 23:24:13 +0100, Richard Hirst <rhirst@linuxcare.com> said:

  Richard> On Thu, May 16, 2002 at 05:35:50PM -0400, Walter Tautz
  Richard> wrote:
  >> I added swiotlb=32768... where do I add this and what does the
  >> number 32768 refer to

  Richard> type 'elilo' and hit return.  It should show an 'ELILO'
  Richard> prompt for a couple of seconds before loading the kernel.
  Richard> In that couple of seconds you need to hit spacebar.  You
  Richard> should now get an 'ELILO:' prompt where you can type
  Richard> things.  Type "linux swiotlb=32768" and hit return.

Do you know why the swiotlb option is needed?  The rx4610 comes with a
qlogic SCSI controller which can do 64-bit DMA.  Thus, it shouldn't
run out of (software) I/O TLB buffers.

	--david


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