kernel not booting if build with gcc-5.2.0

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While switching from fido to jethro we hit the next problem. :(

For one of our machines (based on Marvell Kirkwood, very similar to OpenRD) the kernel build with the preferred gcc-5.2.0 does not boot. Immediately after the kernel is started from u-boot the system freezes. The last output on the console is "Starting kernel ...".

If we build with the also available gcc-4.9.3 the kernel boots fine.

The kernel version is the one siggested by jethro:

SRC_URI = " git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git;protocol=git;nocheckout=1;name=machine \
...
LINUX_VERSION ?= "4.2"
LINUX_VERSION_EXTENSION_append = "-hikirk"
...
SRCREV_machine="64291f7db5bd8150a74ad2036f1037e6a0428df2"

Any suggestions?

Regards,
Steffen

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