From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:55140) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UJtfX-0003jg-Ks for qemu-devel@nongnu.org; Sun, 24 Mar 2013 18:45:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UJtfU-0002a6-ND for qemu-devel@nongnu.org; Sun, 24 Mar 2013 18:45:39 -0400 Received: from moutng.kundenserver.de ([212.227.126.186]:62775) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UJtfU-0002Ze-Dv for qemu-devel@nongnu.org; Sun, 24 Mar 2013 18:45:36 -0400 From: Arnd Bergmann Date: Sun, 24 Mar 2013 22:45:28 +0000 References: <1364124760-5794-1-git-send-email-peter.maydell@linaro.org> <201303242116.28340.arnd@arndb.de> In-Reply-To: MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <201303242245.29045.arnd@arndb.de> Subject: Re: [Qemu-devel] [PATCH 00/10] Fix versatile_pci (and break versatilepb linux guests!) List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Peter Maydell Cc: patches@linaro.org, "Michael S. Tsirkin" , Will Deacon , qemu-devel@nongnu.org, Paul Brook , Andreas =?utf-8?q?F=C3=A4rber?= , Aurelien Jarno On Sunday 24 March 2013, Peter Maydell wrote: > OK, I'll give that a go tomorrow. > > While you're here, do you know what the point of the PCI_SELFID > register is? The h/w docs are clear that the OS has to write > the slot number of the board itself in to this register, but > again I don't see why the OS has to tell the hardware something > it already knows. On QEMU I just implemented this register as > a no-op and everything seems to still function... > I don't know really, but I think it has something to do with the versatile board being plugged into a backplane that has multiple slots. Apparently there is something the hardware cannot figure out itself, e.g. whether to route the interrupts in or out of the slot. Arnd