Hi Ruslan, On 29/07/2016:07:26:03 PM, Ruslan Bilovol wrote: > Hi, > > On Tue, Jul 26, 2016 at 11:09 AM, AKASHI Takahiro > <takahiro.akashi at linaro.org> wrote: > > On Tue, Jul 26, 2016 at 04:56:51PM +0900, AKASHI Takahiro wrote: > >> This patch series adds kdump support on arm64. > >> > >> To load a crash-dump kernel to the systems, a series of patches to > >> kexec-tools, which have not yet been merged upstream, are needed. > >> Please pick Geoff's kexec patches [1] and my kdump patches [2]. > >> > >> To examine vmcore (/proc/vmcore) on a crash-dump kernel, you can use > >> - crash utility (coming v7.1.6 or later) [3] > >> (Necessary patches have already been queued in the master.) > >> > >> [1] http://lists.infradead.org/pipermail/kexec/2016-July/016532.html > >> [2] TBD > > > > See my kexec-tools patches in: > > http://lists.infradead.org/pipermail/kexec/2016-July/016642.html > > I tired this patch series with mentioned Geoff's kexec patches and > your kdump patches, but unfortunately it doesn't work for me. > > While I can successfully load and kexec the kernel ('kexec --load' + > 'kexec -e'), same combination of kernel+ramdisk+dtb doesn't boot > if I do kdump combination ('kexec -p' + sysrq crash), there is no > any output after sysrq crash trace. > Unfortunately I don't have any debugger here for deep investigation > of this issue. Which type of image do you have? I did face issue with binary image which I fixed in my branch, while elf would work fine for kdump as well. > > Also for some reason in case of 'load and kexec the kernel' it > takes 1-2 minutes to start booting after I do kexec -e, need to > investigate it further. Because, D-cache is disabled. > > Which hardware do you use for validating your patches? > > Also, could you please share exact commands you use for > kdump validation? Well, I have some patches for D-cache enabling, which will be sent for review after these set of kexec and kdump patches are merged. Meanwhile, you can use them and give your feedback. They are here: https://github.com/pratyushanand/kexec-tools.git : upstream_arm64_devel I use following command with my test branch. You can ignore --port and --port-lsr in your setup. You may use --enable-dcache and let me know if it works for you and improves execution speed. You may need to change vmlinux and inird name as per your setup. for kexec test: kexec -l /boot/vmlinuz-`uname -r` --initrd=/boot/initramfs-`uname -r`.img --reuse-cmdline --enable-dcache --port=0x1c020000 --port-lsr=0x1c020014,0x60;kexec -e for kdump test: kexec -p /boot/vmlinuz-`uname -r` --initrd=/boot/initramfs-`uname -r`kdump.img --reuse-cmdline --enable-dcache --port=0x1c020000 --port-lsr=0x1c020014,0x60 --append="irqpoll maxcpus=1 reset_devices"; echo c > /proc/sysrq-trigger ~Pratyush
