From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lU8vk-0056BO-UT for kexec@lists.infradead.org; Wed, 07 Apr 2021 14:13:20 +0000 Subject: Re: crashkernel reservation failed - No suitable area found on a cortina/gemini SoC References: From: Bruce Mitchell Message-ID: <34ff1fcc-e9ee-02c2-b2a8-d98a24ce94c3@linux.vnet.ibm.com> Date: Wed, 7 Apr 2021 07:13:04 -0700 In-Reply-To: Content-Language: en-US MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Corentin Labbe , ebiederm@xmission.com, kexec@lists.infradead.org Cc: linux-kernel@vger.kernel.org On 4/7/2021 05:54, Corentin Labbe wrote: > Hello > > I try to do kexec on a cortina/gemini SoC. > On a "normal" boot, kexec fail to find memory so I added crashkernel=8M to cmdline. (kernel size is ~6M). > But now, kernel fail to reserve memory: > Load Kern image from 0x30020000 to 0x800000 size 7340032 > Booting Linux on physical CPU 0x0 > Linux version 5.12.0-rc5-next-20210401+ (compile@Red) (armv7a-unknown-linux-gnueabihf-gcc (Gentoo 9.3.0-r2 p4) 9.3.0, GNU ld (Gentoo 2.34 p6) 2.34.0) #98 PREEMPT Wed Apr 7 14:14:08 CEST 2021 > CPU: FA526 [66015261] revision 1 (ARMv4), cr=0000397f > CPU: VIVT data cache, VIVT instruction cache > OF: fdt: Machine model: Edimax NS-2502 > Memory policy: Data cache writeback > Zone ranges: > Normal [mem 0x0000000000000000-0x0000000007ffffff] > HighMem empty > Movable zone start for each node > Early memory node ranges > node 0: [mem 0x0000000000000000-0x0000000007ffffff] > Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff] > crashkernel reservation failed - No suitable area found. > Built 1 zonelists, mobility grouping on. Total pages: 32512 > Kernel command line: console=ttyS0,19200n8 ip=dhcp crashkernel=8M > Dentry cache hash table entries: 16384 (order: 4, 65536 bytes, linear) > Inode-cache hash table entries: 8192 (order: 3, 32768 bytes, linear) > mem auto-init: stack:off, heap alloc:off, heap free:off > Memory: 119476K/131072K available (5034K kernel code, 579K rwdata, 1372K rodata, 3020K init, 210K bss, 11596K reserved, 0K cma-reserved, 0K highmem) > SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 > > What can I do ? > > Thanks > Regards > > _______________________________________________ > kexec mailing list > kexec@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec > Hello Corentin, I see much larger crashkernel=xxM being shown here https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/kdump/kdump.rst and from many of my other searches. Here is an interesting article on kdump for ARM-32 https://kaiwantech.wordpress.com/2017/07/13/setting-up-kdump-and-crash-for-arm-32-an-ongoing-saga/ Here is the kernel command line reference https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/kernel-parameters.txt?h=v5.11#n732 I feel your frustrations too. -- Bruce _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec