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Received: from shell.armlinux.org.uk ([2002:4e20:1eda:1:5054:ff:fe00:4ec]:42612) by pandora.armlinux.org.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jLihc-0006a5-1h; Tue, 07 Apr 2020 08:31:20 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1jLihZ-00070T-KM; Tue, 07 Apr 2020 08:31:17 +0100 Date: Tue, 7 Apr 2020 08:31:17 +0100 From: Russell King - ARM Linux admin To: Corentin Labbe Subject: Re: Trying to kexec on Allwinner A80 Message-ID: <20200407073117.GH25745@shell.armlinux.org.uk> References: <20200406082720.GA31279@Red> <20200406091600.GF25745@shell.armlinux.org.uk> <20200406092540.GB31279@Red> <20200406093729.GG25745@shell.armlinux.org.uk> <20200406201053.GA10931@Red> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200406201053.GA10931@Red> 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-20200407_003129_311750_ADA89916 X-CRM114-Status: GOOD ( 18.50 ) 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: kexec@lists.infradead.org, linux-kernel@vger.kernel.org, mripard@kernel.org, wens@csie.org, ebiederm@xmission.com, linux-arm-kernel@lists.infradead.org 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 Mon, Apr 06, 2020 at 10:10:53PM +0200, Corentin Labbe wrote: > On Mon, Apr 06, 2020 at 10:37:29AM +0100, Russell King - ARM Linux admin wrote: > > On Mon, Apr 06, 2020 at 11:25:40AM +0200, Corentin Labbe wrote: > > > On Mon, Apr 06, 2020 at 10:16:00AM +0100, Russell King - ARM Linux admin wrote: > > > > On Mon, Apr 06, 2020 at 10:27:20AM +0200, Corentin Labbe wrote: > > > > > Hello > > > > > > > > > > I am trying to add the last missing Allwinner Soc in kernelci: the A80. > > > > > But this SoC does not have any way to be used in kernelci, no USB nor network in uboot. > > > > > So I have tried to fake uboot since the kernel has network support and run the new kernel via kexec. > > > > > > > > > > But kexec 2.0.18 fail to work: > > > > > kexec --force /tmp/kernel --initrd /tmp/ramdisk --dtb /tmp/dtb --command-line='console=ttyS0,115200n8 root=/dev/ram0 earlycon=uart,mmio32,0x7000000 ip=dhcp' > > > > > > > > What happens if you omit the dtb argument? > > > > > > > > > > No change without dtb > > > > > > I have also tried to add --mem-mim and --mem-max without any change. > > > I given mem according to what I saw in /proc/iomem > > > 20000000-9fffffff : System RAM > > > 20008000-207fffff : Kernel code > > > 20900000-209a0c87 : Kernel data > > > So I gave --mem-min 0x30000000 --mem-max 0x9fffffff > > > Anyway, the result is always the same. > > > > The next step is to enable the early debugging - first in the > > decompressor - add #define DEBUG to the top of > > arch/arm/boot/compressed/head.S > > > > Also enable DEBUG_LL in the kernel and use earlyprintk to see if you can > > get anything from the new kernel. > > > > I dont know what happened, but now I always get "Could not find a free area of memory of 0x86c1c0 bytes..." (even with kexec 2.0.18) > Furthermore, I have added crashkernel=128M to the cmdlist > I have verified that the reservation is working: > 20000000-9fffffff : System RAM > 20008000-207fffff : Kernel code > 20900000-209a0c87 : Kernel data > 40000000-47ffffff : Crash kernel > But even with this reservation, no change. crashkernel is only necessary if you're loading a kenrel image to be booted when the existing one has crashed. For the problem you're seeing, it's an unnecessary additional change; please drop that. You could try running kexec with debug enabled to see more information. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 10.2Mbps down 587kbps up _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel