From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Warren Subject: Re: [PATCH V3 1/5] ARM: implement debug_ll_io_init() Date: Mon, 05 Nov 2012 12:03:57 -0700 Message-ID: <50980D9D.7050207@wwwdotorg.org> References: <1350686507-3022-1-git-send-email-swarren@wwwdotorg.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1350686507-3022-1-git-send-email-swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Stephen Warren Cc: Olof Johansson , Arnd Bergmann , Rob Herring , Russell King - ARM Linux , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Rob Herring List-Id: linux-tegra@vger.kernel.org On 10/19/2012 04:41 PM, Stephen Warren wrote: > When using DEBUG_LL, the UART's (or other HW's) registers are mapped > into early page tables based on the results of assembly macro addruart. > Later, when the page tables are replaced, the same virtual address must > remain valid. Historically, this has been ensured by using defines from > in both the implementation of addruart, and the machine's > .map_io() function. However, with the move to single zImage, we wish to > remove . To enable this, the macro addruart may be used > when constructing the late page tables too; addruart is exposed as a > C function debug_ll_addr(), and used to set up the required mapping in > debug_ll_io_init(), which may called on an opt-in basis from a machine's > .map_io() function. Patch 1 has been taken into arm-soc, and I've applied patches 2-5 to the Tegra tree. From mboxrd@z Thu Jan 1 00:00:00 1970 From: swarren@wwwdotorg.org (Stephen Warren) Date: Mon, 05 Nov 2012 12:03:57 -0700 Subject: [PATCH V3 1/5] ARM: implement debug_ll_io_init() In-Reply-To: <1350686507-3022-1-git-send-email-swarren@wwwdotorg.org> References: <1350686507-3022-1-git-send-email-swarren@wwwdotorg.org> Message-ID: <50980D9D.7050207@wwwdotorg.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 10/19/2012 04:41 PM, Stephen Warren wrote: > When using DEBUG_LL, the UART's (or other HW's) registers are mapped > into early page tables based on the results of assembly macro addruart. > Later, when the page tables are replaced, the same virtual address must > remain valid. Historically, this has been ensured by using defines from > in both the implementation of addruart, and the machine's > .map_io() function. However, with the move to single zImage, we wish to > remove . To enable this, the macro addruart may be used > when constructing the late page tables too; addruart is exposed as a > C function debug_ll_addr(), and used to set up the required mapping in > debug_ll_io_init(), which may called on an opt-in basis from a machine's > .map_io() function. Patch 1 has been taken into arm-soc, and I've applied patches 2-5 to the Tegra tree.