Am Freitag, 23. Oktober 2015, 12:54:56 schrieb Michael Ellerman:

On Thu, 2015-10-22 at 12:15 -0700, Geoff Levand wrote:

quoted

Hi,

On Fri, 2015-10-09 at 23:13 +0200, Marc Dietrich wrote:

quoted

Am Freitag, 9. Oktober 2015, 10:45:42 schrieb Geoff Levand:

quoted

With the 4.2-rc4 kernel, kexec seems to work when CONFIG_SPU_FS=n.

 I

have not tried with petitboot release white-09.09.01-15.56 yet though.

I guess you mean 4.3-rc4. Still no luck with CONFIG_SPU_FS=n. No output
even with direct calling kexec. Can you put a working kernel/initrd to
some place so I can try this?

I did some more work on this, but still did not find out what the problem
is.  Kexec from 4.3 -> 4.3 works, but with the white-09.09.01-15.56

petitboot (2.6.30.9) -> 4.3 gets a kernel panic:
 -> early_setup(), dt_ptr: 0x7fff000

Kernel panic - not syncing: BUG: Failed verifying flat device tree, bad
version?

I'll look at it some more as I find time.

That says that the device tree firmware gave you (ie. from kexec), is using
an old version of the device tree format.

I can't remember off the top of my head which version you need, but
basically newer kernels require a newer device tree format. So your kexec
might be too old?

that reminds me about a different question. I said before that I use plain 
vmlinux for the kernel image. This works at least with 2.6.35 (the newest 
kernel I got booting so far). But I also saw that a device tree is being 
compiled and linked with the kernel to produce a dt image in 
arch/powerpc/boot. Is it possible that newer kernels require a device tree?

Marc