I use MitySOM-5CSX dev kit (altera cyclone v socfpga) from Critical Link and i would like to boot to a different kernel using kexec. In my configuration: KERNEL : https://github.com/altera-opensource/linux-socfpga/archive/socfpga-4.9.76-ltsi-rt.zip COMPILER : https://releases.linaro.org/archive/14.04/components/toolchain/binaries/gcc-linaro-arm-linux-gnueabihf-4.8-2014.04_linux.tar.bz2 In the kernel configuration kexec is enabled zcat /proc/config.gz |grep KEXEC CONFIG_KEXEC_CORE=y CONFIG_KEXEC=y and the default kernel cmdline is # cat /proc/cmdline root=/dev/mmcblk0p3 rootwait rw earlycon kexec tools version is #./kexec --version kexec-tools 2.0.19 "uboot kernel" and 'kexec kernel' are the same version (socfpga-4.9.76-ltsi-rt). The "kexec kernel" has just more modules enabled compared to the default "uboot kernel" First the kernel is loaded with kexec tools #./kexec -d -c -l zImagebkx --dtb=socfpga_cyclone5_mitysom5csx_devkit.dtb --command-line="root=/dev/mmcblk0p3 rootwait rw earlycon" syscall kexec_file_load not available. kernel: 0xb6ab1008 kernel_size: 0x4a55c8 MEMORY RANGES 0000000000000000-000000003fffffff (0) zImage header: 0x016f2818 0x00000000 0x004a55c8 zImage size 0x4a55c8, file size 0x4a55c8 zImage requires 0x004b65c8 bytes Kernel: address=0x00008000 size=0x0178fce8 DT : address=0x01799000 size=0x00007d00 kexec_load: entry = 0x8000 flags = 0x280000 nr_segments = 2 segment[0].buf = 0xb6ab1008 segment[0].bufsz = 0x4a55cc segment[0].mem = 0x8000 segment[0].memsz = 0x4a6000 segment[1].buf = 0x8e630 segment[1].bufsz = 0x7d00 segment[1].mem = 0x1799000 segment[1].memsz = 0x8000 and then try to start the new new kernel # kexec -d -e [ 127.922829] kexec_core: Starting new kernel [ 127.927024] Disabling non-boot CPUs ... [ 127.976277] CPU1: shutdown [ 127.979899] Bye! but then nothing happens and no messages on console. After enabling “Kernel Hacking” -> "Kernel low-level debugging functions " the kexec'd zImagebkx kernel gives the following result kexec -d -e [ 134.110855] kexec_core: Starting new kernel [ 134.115064] Disabling non-boot CPUs ... [ 134.176961] CPU1: shutdown [ 134.180624] Bye! Uncompressing Linux... done, booting the kernel. and then nothing . At least the “Uncompressing Linux… done, booting the kernel.” message means that the kexec'd kernel starts to execute and reaches at least at line 546 of “/arch/arm/boot/compressed/head.S” file executing the following instruction: bl decompress_kernel. According to this patch https://patchwork.kernel.org/patch/6504321/ kexec is supported on socfpga. Downloading an older series kernel for socfpga (4.1.22) from (https://github.com/dlaut/linux-socfpga , unfortunatelly older series kernels are not available from official https://github.com/altera-opensource/linux-socfpga ) and applying the above patch i was able to kexec boot the 4.9.76-ltsi-rt kernel from the 4.1.22 kernel as shown bellow root@node1:/mnt/test#uname -a Linux node1 4.1.22-ltsi-altera #2 SMP PREEMPT Mon Jul 29 12:38:06 EEST 2019 armv7l GNU/ We then kexec load the 4.9.76 kernel root@node1:/mnt/test#./kexec -d -c -l zImagebkx --dtb=socfpga_cyclone5_mitysom5csx_devkit.dtb --command-line="root=/dev/mmcblk0p3 rootwait rw earlycon" and then start the kernel (successfully!!) with root@node1:/mnt/test# kexec -d -e [ 46.306102] kexec: Starting new kernel [ 46.309928] Disabling non-boot CPUs ... [ 46.306102] kexec: Starting new kernel [ 46.378053] CPU1: shutdown [ 46.381875] Bye! Uncompressing Linux... done, booting the kernel. [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.9.76-rt61-ltsi-altera (aggelis@corei5) (gcc version 4.8.3 20140401 (prerelease) (crosstool-NG l9 [ 0.000000] CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=10c5387d [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] OF: fdt:Machine model: MitySOM-5CSX Altera SOCFPGA Cyclone V [ 0.000000] cma: Reserved 16 MiB at 0x3f000000 [ 0.000000] Memory policy: Data cache writealloc [ 0.000000] percpu: Embedded 15 pages/cpu @ef6bf000 s29184 r8192 d24064 u61440 [ 0.000000] Built 1 zonelists#./kexec -d -c -l zImagebkx --dtb=socfpga_cyclone5_mitysom5csx_devkit.dtb --command-line="root=/dev/mmcblk0p3 rootwait rw earlycon" in Zone order, mobility grouping on. Total pages: 260416 [ 0.000000] Kernel command line: root=/dev/mmcblk0p3 rootwait [ 0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes) ..... ..... Angstrom v2017.12 - Kernel 4.9.76-rt61-ltsi-altera node1 login: Is there something i am missing or kexec broke in later series 4 kernels for arm (socfpga)? Aggelis Aggelis _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
