From: Fabrice Bellard <fabrice@bellard.org>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Re: Re: NE2K PCI and Windows 98SE & Cirrus Logic
Date: Wed, 09 Jun 2004 21:54:29 +0200 [thread overview]
Message-ID: <40C76AF5.6060801@bellard.org> (raw)
In-Reply-To: <20040608131418.N1510@edinburgh.cisco.com>
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.
prev parent reply other threads:[~2004-06-09 19:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-08 8:18 [Qemu-devel] Re: Re: NE2K PCI and Windows 98SE & Cirrus Logic Mike Nordell
2004-06-08 9:15 ` Antony T Curtis
2004-06-08 12:18 ` Derek Fawcus
2004-06-09 20:12 ` Fabrice Bellard
2004-06-09 20:16 ` Fabrice Bellard
2004-06-08 12:14 ` Derek Fawcus
2004-06-09 19:54 ` Fabrice Bellard [this message]
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