From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:58336) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SiPjP-0006JX-3Y for qemu-devel@nongnu.org; Sat, 23 Jun 2012 08:46:28 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SiPjN-0001Jf-F6 for qemu-devel@nongnu.org; Sat, 23 Jun 2012 08:46:26 -0400 Received: from mout.web.de ([212.227.17.11]:54805) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SiPjN-0001JW-5B for qemu-devel@nongnu.org; Sat, 23 Jun 2012 08:46:25 -0400 Message-ID: <4FE5BA8F.7050405@web.de> Date: Sat, 23 Jun 2012 14:46:07 +0200 From: =?ISO-8859-1?Q?Andreas_F=E4rber?= MIME-Version: 1.0 References: <4FE58C20.4020803@web.de> In-Reply-To: <4FE58C20.4020803@web.de> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] MMIO coalescing of the i82378 bridge List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jan Kiszka Cc: =?ISO-8859-1?Q?Herv=E9_Poussineau?= , qemu-devel Hi Jan, Am 23.06.2012 11:28, schrieb Jan Kiszka: > just stumbled over the memory_region_set_coalescing in pci_i82378_init: > What ISA devices are affected by this? It looks a bit strange to me as > the MMIO requests are apparently mapped on PIO requests, and we don't > have PIO coalescing on x86. Depending on the target device on PREP, this > may have some unexpected side effects. Or is only framebuffer memory > addressed this way? I only remember touching that line to rebase it onto either Memory API or QOM. The i82378 is the sole PCI-ISA bridge so all ISA devices will be affected by it, which is pretty much everything except VGA iirc. The upcoming pc87312(?) Super I/O also would be attached to it, replacing some of the bogus I/O in the current "prep" machine. I'm not familiar with what this option affects. What unexpected side effects would you expect? :) Regards, Andreas