Hi Vivek, On Tue, 2014-09-30 at 16:29 -0400, Vivek Goyal wrote: > On Thu, Sep 25, 2014 at 12:23:26AM +0000, Geoff Levand wrote: > > [..] > > To load a second stage kernel and execute a kexec re-boot on arm64 my patches to > > kexec-tools [2], which have not yet been merged upstream, are needed. > > > > This series does not include some re-work of the spin-table CPU enable method > > that is needed to support it, > > How do I figure out if my system has spin table enable method or psci > enable method. Can one change it. I wanted to test your patches. The enable method is a function the firmware/bootloader provides. Multiple methods may be supported. The boot-wrapper-aarch64 build defaults to spin-table, but has the configure option --enable-psci. For a running system you can check the device tree: cat /proc/device-tree/cpus/cpu\@0/enable-method | hexdump -C Or the dmsg: dmesg | egrep -i 'psci' Or use the --debug option to kexec: kexec --debug --load /boot/vmlinux.strip ... read_cpu_info:398: cpu-0 (/cpus/cpu at 0): hwid-0, 'psci' -Geoff
