Re: Kexec on arm64

[Arun Chandran <achandran@mvista.com>]

On Wed, Jul 9, 2014 at 3:43 PM, Arun Chandran <achandran@mvista.com> wrote:
> Hi,
>
> I found the kexec development on arm64 here
> http://www.spinics.net/lists/arm-kernel/msg329563.html
>
> Went to try it on my armv8 hardware after cloning
>
> git://git.linaro.org/people/geoff.levand/linux-kexec.git and
> https://git.linaro.org/people/geoff.levand/kexec-tools.git
>
> Did
> 1) ~/work/aarch64-kernel/kexec-tools$ ./bootstrap
> 2)~/work/aarch64-kernel/kexec-tools$ ./configure
> --prefix=/tmp/kexec_install --host=aarch64-linux-gnu
> 3) make
>
> and got this error
>
> elf-arm64.o kexec/arch/arm64/kexec-elf-arm64.c
> kexec/arch/arm64/kexec-elf-arm64.c: In function ‘elf_arm64_probe’:
> kexec/arch/arm64/kexec-elf-arm64.c:32:24: error: ‘EM_AARCH64’
> undeclared (first use in this function)
>   if (ehdr.e_machine != EM_AARCH64) {
>                         ^
> kexec/arch/arm64/kexec-elf-arm64.c:32:24: note: each undeclared
> identifier is reported only once for each function it appears in
> make: *** [kexec/arch/arm64/kexec-elf-arm64.o] Error 1
>

I compiled kexec-tools(
https://git.linaro.org/people/geoff.levand/kexec-tools.git)
by commenting that "machine check"

--- a/kexec/arch/arm64/kexec-elf-arm64.c
+++ b/kexec/arch/arm64/kexec-elf-arm64.c
@@ -28,12 +28,13 @@ int elf_arm64_probe(const char *kernel_buf, off_t
kernel_size)
                dbgprintf("Not an ELF executable.\n");
                goto on_exit;
        }
-
+#if 0
        if (ehdr.e_machine != EM_AARCH64) {
                dbgprintf("Not an AARCH64 executable.\n");
                result = -EINVAL;
                goto on_exit;
        }
+#endif

        result = 0;


After copying the resulting binaries to my target; I tried loading the
kernel Image

# kexec -l /Image
Modified cmdline: root=/dev/nfs
Unable to find /proc/device-tree//chosen/linux,stdout-path, printing
from purgatory is diabled
Cannot determine the file type of /Image

It failed to load the kernel Image. Any pointers?

--Arun














> Am I missing something here?
>
> --Arun

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