Re: [Qemu-devel] Re: Re: NE2K PCI and Windows 98SE & Cirrus Logic

[Fabrice Bellard]

Derek Fawcus wrote:
> On Tue, Jun 08, 2004 at 10:18:22AM +0200, Mike Nordell wrote:
>
> > I'm still curious why 32MB is claimed in the pci_register_io_region call,
> > even that it only has got 4MB.
>
>
> Because that what's the hardware does - actually,  from memory I thought
> this family only claimed 16M.
>
> The reason for the larger size is given in the datasheet - it's multiple
> mapped copies of the RAM so as top have automatic byteswapping.  So something
> to beware of if this device is used under the PPC emulation.

32M is correct: 16M are mapped for the frame buffer in various 
endiannesses and 16M for the bitblt engine data access (in 5446 rev B).

Fabrice.