From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.33) id 1Bj5vY-0004AA-BH for qemu-devel@nongnu.org; Fri, 09 Jul 2004 20:41:16 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.33) id 1Bj5vW-00049e-MC for qemu-devel@nongnu.org; Fri, 09 Jul 2004 20:41:16 -0400 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.33) id 1Bj5vW-00049b-Io for qemu-devel@nongnu.org; Fri, 09 Jul 2004 20:41:14 -0400 Received: from [144.254.224.140] (helo=ams-iport-1.cisco.com) by monty-python.gnu.org with esmtp (Exim 4.34) id 1Bj5tC-0006qw-D8 for qemu-devel@nongnu.org; Fri, 09 Jul 2004 20:38:50 -0400 Received: from cisco.com (edinburgh.cisco.com [144.254.112.76]) by ams-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id i6A0cjU7008248 for ; Sat, 10 Jul 2004 02:38:46 +0200 (MEST) Received: (from dfawcus@localhost) by cisco.com (8.8.8/2.6/Cisco List Logging/8.8.8) id BAA05030 for qemu-devel@nongnu.org; Sat, 10 Jul 2004 01:38:45 +0100 (BST) Date: Sat, 10 Jul 2004 01:38:45 +0100 From: Derek Fawcus Subject: Re: [Qemu-devel] Re: RFC for new features Message-ID: <20040710013845.L10322@edinburgh.cisco.com> References: <40ED8EF0.1040501@bellard.org> <1089411210.59382.215.camel@pcgem.rdg.cyberkinetica.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <1089411210.59382.215.camel@pcgem.rdg.cyberkinetica.com>; from antony.t.curtis@ntlworld.com on Fri, Jul 09, 2004 at 11:13:30PM +0100 Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org On Fri, Jul 09, 2004 at 11:13:30PM +0100, Antony T Curtis wrote: > > 2) There are device emulation issues : > > The current cirrusvga is a vast improvement over the previous bochs > > device. However, pushing available memory to more than 4 Mb wold allow for > > better resolutions : 1024x768x16 is a bit limiting in some uses. Huh - I don't think there are any specific pitch restrictions on this chipset. 4M should allow 1280x1024@24bpp (or 1152x864@32bpp). Is that not enougth? > Well - the CL-GD544X chips can only handle 4MB of memory, maximum. For > larger framebuffers, we would have to emulate a different video chip - > If we wish to stick to Cirrus Logic, The Laguna CL-GD546x chips can > address up to 16MB I think.... Nope. Only 8M. The architecture has scope for 2 RAMBUS channels, but they only implemented chips with 1 RAMBUS channel. One of the fields in the channel control register is 3 bits, identifying the number of 1M ram banks available... (Someone who has spent too long playing with Laguna chips). Besides, the Laguna is a more complex beast with a 3 operand BitBLT engine... DF