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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:39056) by pandora.armlinux.org.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1iUq8f-0003c8-Cz; Wed, 13 Nov 2019 10:44:41 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1iUq8d-0002OV-HN; Wed, 13 Nov 2019 10:44:39 +0000 Date: Wed, 13 Nov 2019 10:44:39 +0000 From: Russell King - ARM Linux admin To: Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= Subject: Re: [PATCH/RFC] ARM: boot: Relax kernel image alignment for RZ/A with CS3 SDRAM Message-ID: <20191113104439.GN25745@shell.armlinux.org.uk> References: <20191113102729.29303-1-geert+renesas@glider.be> <20191113104037.e45j37xoxeztvut3@pengutronix.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20191113104037.e45j37xoxeztvut3@pengutronix.de> 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_024454_796151_E401A902 X-CRM114-Status: GOOD ( 17.98 ) 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: Geert Uytterhoeven , Arnd Bergmann , Nicolas Pitre , linux-renesas-soc@vger.kernel.org, Chris Brandt , Eric Miao , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 11:40:37AM +0100, Uwe Kleine-K=F6nig 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). > = > This wording is misleading. You don't adapt the limit because 128 MiB > > the amount of RAM on that platform but because the alignment of the CS3 > space isn't a multiple of 128 MiB. So I suggest: > = > On the RZA2MEVB the SDRAM's base is at 0x0C000000 which isn't > aligned to 128 MiB. So to ensure the assumptions of the > decompressor are valid the used alignment must be decreased. > = > > 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. > = > I would assume that it indeed breaks existing platforms. So maybe better > make this configurable, default to 128 MiB and select it to 64 MiB on > the affected platform? If the resulting kernel supports also other > machines a warning (at compile time) might be a good idea. Are we going back to non-multi-platform kernels? ;) -- = 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