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Received: from shell.armlinux.org.uk ([2001:4d48:ad52:3201:5054:ff:fe00:4ec]:55748) by pandora.armlinux.org.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1iUw4B-0005e6-KM; Wed, 13 Nov 2019 17:04:27 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1iUw49-0002bd-41; Wed, 13 Nov 2019 17:04:25 +0000 Date: Wed, 13 Nov 2019 17:04:25 +0000 From: Russell King - ARM Linux admin To: Geert Uytterhoeven Subject: Re: [PATCH/RFC] ARM: boot: Relax kernel image alignment for RZ/A with CS3 SDRAM Message-ID: <20191113170425.GQ25745@shell.armlinux.org.uk> References: <20191113102729.29303-1-geert+renesas@glider.be> <20191113103919.GM25745@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191113_090440_147971_29BB423A X-CRM114-Status: GOOD ( 22.28 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Arnd Bergmann , Nicolas Pitre , Linux-Renesas , Chris Brandt , Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= , Eric Miao , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Nov 13, 2019 at 02:32:19PM +0100, Geert Uytterhoeven wrote: > Hi Russell, > > On Wed, Nov 13, 2019 at 11:39 AM Russell King - ARM Linux admin > wrote: > > On Wed, Nov 13, 2019 at 11:27:29AM +0100, Geert Uytterhoeven wrote: > > > The RZA2MEVB sub board has 64 MiB of SDRAM at 0x0C000000 (CS3 space). > > > Hence the mask for CONFIG_AUTO_ZRELADDR needs to be changed, otherwise > > > the system will crash because it will try to decompress a zImage or > > > uImage to a non-RAM garbage address. > > > > > > Based on a patch in the BSP by Chris Brandt . > > > > > > Signed-off-by: Geert Uytterhoeven > > > --- > > > No idea what to do with the rest of the comment, or if this breaks > > > existing platforms. > > > > We occasionally have discussions about this - the last one was a big > > one in Edinburgh, and the answer is we can't change this in mainline. > > They've also come up on the mailing lists as well. > > > > I'm not going to rehash this old argument yet again - the comment > > details the reason for it, and is there to prevent exactly this. > > Sorry, I wasn't aware of that discussion. > I had a chat about this at ELC-E with Arnd, and he was open to this change. > > > If someone is silly enough to come up with a platform that violates > > the documented 32-bit ARM booting protocol, then they can't expect > > the kernel to bend to their platform's requirements at the expense of > > already merged platforms. > > Documentation/arm/booting.rst: > 1. The kernel should be placed in the first 128MiB of RAM: check. > 2. A safe location is just above the 128MiB boundary from start of RAM: > oops. Not all platforms have more than 128 MiB of RAM... > > An alternative is to fall to the builtin 4 MiB of SRAM, or the 8 MiB of > HyperRAM on RZA2MEVB, but doing that requires using XIP. > Which brings us to your response in the other email: > > > Are we going back to non-multi-platform kernels? ;) > > Good question! ;-) > > 1. CONFIG_AUTO_ZRELADDR=n > 2. CONFIG_XIP_KERNEL=y If you're using an XIP kernel, you are by definition not using the decompressor. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel