On Sun, 2009-08-09 at 22:33 +0200, Peter Stuge wrote: > Cristi Magherusan wrote: > > if mkelfimage is still needed > > I don't know. > > > > ELF vmlinux binary with initramfs > > Yes, it's a good idea. Please try it and report if it works. Also see > http://www.coreboot.org/Initramfs
I have a similar image generated using buildroot(for the userland/initramfs), and the kernel's initramfs option that allows it to use a designated directory. It seems to fail with both approaches when using CBFS (qemu with LAB kernel). With mkelfimage qemu crashes, while without it freezes while trying to load the kernel. The same kernel boots in qemu when compiled as bzImage, and the userspace is loaded fine. > > > Does it have anything to do with the multiboot specification, > > No, multiboot is a separate topic. > > > or why does coreboot need the ELF to be modified using the > > mkelfImage tool? > > I am not sure that it does need that. Did you try using the plain > vmlinux? Yes, still fails. > Can you compare the vmlinux entry point with the entrypoint of an > mkelfImaged ELF image? It differs, I suppose mkelfimage adds its own binary glue that will run before calling the real kernel image. Here's the "readelf -h" output for both(first is with mkelfImage). File: ./buildroot-payload.elf ELF Header: Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 Class: ELF32 Data: 2's complement, little endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: EXEC (Executable file) Machine: Intel 80386 Version: 0x1 Entry point address: 0x10000 Start of program headers: 52 (bytes into file) Start of section headers: 0 (bytes into file) Flags: 0x0 Size of this header: 52 (bytes) Size of program headers: 32 (bytes) Number of program headers: 5 Size of section headers: 0 (bytes) Number of section headers: 0 Section header string table index: 0 File: ./vmlinux ELF Header: Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 Class: ELF32 Data: 2's complement, little endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: EXEC (Executable file) Machine: Intel 80386 Version: 0x1 Entry point address: 0x100000 Start of program headers: 52 (bytes into file) Start of section headers: 4995368 (bytes into file) Flags: 0x0 Size of this header: 52 (bytes) Size of program headers: 32 (bytes) Number of program headers: 3 Size of section headers: 40 (bytes) Number of section headers: 30 Section header string table index: 29 I'll try to make the kernel entry point the same as mkelfimage, but I doubt it will work. Any other ideas? If anyone decides to give it a try, the kernel images are available here: http://panzer.utcluj.ro/~alien/coreboot/elfs.tar.bz2 Thanks, Cristi -- Ing. Cristi Măgherușan, System/Network Engineer Technical University of Cluj-Napoca, Romania http://cc.utcluj.ro +40264 401247
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