[Linux-ia64] Re: Support for more than 2GB RAM

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

You should be able to change that check to 4GB without ill effects.
(The 1GB check is there for historical reasons.)  Anyhow, if this
isn't urgent, I'd just wait until Goutham is done with the PCI DMA
implementation and then that check will go away completely.

	--david

>>>>> On 19 Jul 2000 11:07:15 +0200, Christoph Rohland <cr@sap.com> said:

  Christoph> David Mosberger <davidm@hpl.hp.com> writes:
  >> >>>>> On 18 Jul 2000 14:40:42 +0200, Christoph Rohland
  >> <cr@sap.com> said:
  >> 
  Christoph> Hi, Are there any plans to support more than 2GB RAM in
  Christoph> the near future?
  >>  There never was a limit for 2GB.  4GB is no problem and more
  >> than 4GB works fine also except if there are 32-bit PCI devices
  >> that do DMA (or the machine has huge holes in the physical
  >> address space, which isn't true for the prototypes).  For the DMA
  >> issue, a solution is in the works (Goutham has been working on
  >> this).

  Christoph> So why do I get the following:

  Christoph> Linux version 2.4.0-0.8smp (root@boris.devel.redhat.com)
  Christoph> (gcc version 2.9-ia64-0 00216-final) #1 SMP Sun Jun 18
  Christoph> 00:32:35 EDT 2000 EFI v0.92 by INTEL
  Christoph> AL460GX.86B.0027.D27.021800: SALsystab=0x7ff29d60
  Christoph> ACPI=0x7ffd 9718 MPS=0x7ffd0000 map_pal_code: mapping PAL
  Christoph> code [0x7ff40000-0x7ff7b000) into [0xe00000007fc00000-
  Christoph> 0xe000000080000000) Warning: ignoring 0MB of memory above
  Christoph> 1GB!  Warning: ignoring 0MB of memory above 1GB!
  Christoph> Warning: ignoring 2046MB of memory above 1GB!

  Christoph> and I can only use 2GB of my 4GB machine?

  Christoph> Greetings Christoph