[coreboot] Discussion about dynamic PCI MMIO size on x86

Gerd Hoffmann kraxel at redhat.com
Mon Jun 6 10:01:13 CEST 2016


  Hi,

> I think one can go with 2GB MMIO hole.

Agreeing here.  We have PAE.  Non-ancient 32bit kernels should support
and use it, for both security reasons (nox support requires PAE page
table format) and accessing physical address space above 4G.

> The PCIe > 4GB is a question, I don't 
> think Windows have good support for this.

Depends on the version.  Recent windows versions have no problems
handling it.  WinXP throws a BSOD though in case it finds a 64bit mmio
window described in \_SB.PCI0._CRS ...

cheers,
  Gerd




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