I am trying to boot ELF image that is combined kernel + ramdisk. I have tried to use wraplinux tool to wrap these two image but kexec doesn't seem to boot the combined image. To keep things simple I have decided to first just wrap bzImage wraplinux -E --output vmlinux.wrap ./arch/i386/boot/bzImage readelf -S vmlinux.wrap There are 5 section headers, starting at offset 0x1f4098: Section Headers: [Nr] Name Type Addr Off Size ES Flg Lk Inf Al [ 0] NULL 00000000 000000 000000 00 0 0 0 [ 1] setup PROGBITS 00010000 000080 002a00 00 WAX 0 0 16 [ 2] reloc PROGBITS 00012a00 002a80 0005bc 00 WAX 0 0 16 [ 3] kernel PROGBITS 00100000 003040 1f1038 00 A 0 0 16 [ 4] .shstrtab STRTAB 00000000 1f4078 00001e 00 0 0 1 Key to Flags: W (write), A (alloc), X (execute), M (merge), S (strings) I (info), L (link order), G (group), x (unknown) O (extra OS processing required) o (OS specific), p (processor specific) I am trying to load this image in my existing kernel using following command line ( i instrumented the kexec a bit to print info structure to see if kexec is reading the elf image correctly kexec --type=elf-x86 --args-elf --reuse-cmdline ./vmlinux.wrap kexec_load: entry = 0x17d8 flags = 0 nr_segments = 4 segment[0].buf = 0x806f7b0 segment[0].bufsz = 7060 segment[0].mem = 0x1000 segment[0].memsz = 9000 segment[1].buf = 0x8076818 segment[1].bufsz = ec segment[1].mem = 0xa000 segment[1].memsz = 1000 segment[2].buf = 0xb79f6088 segment[2].bufsz = 2fbc segment[2].mem = 0x10000 segment[2].memsz = 3000 segment[3].buf = 0xb79f9048 segment[3].bufsz = 1f1038 segment[3].mem = 0x100000 segment[3].memsz = 1f2000 I follow this my kexec -e and my machine "hangs". Anybody has tried booting output of wraplinux using kexec? I have had similar problems with mkelf-linux tool chain as well... /Subodh
