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From: | Fabrice Bellard |
Subject: | Re: [Qemu-devel] Re: Re: NE2K PCI and Windows 98SE & Cirrus Logic |
Date: | Wed, 09 Jun 2004 21:54:29 +0200 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030624 |
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.
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