[yocto] Problem with own kernel recipe on Dora

[Nicolas Dechesne]

On Tue, Apr 22, 2014 at 9:52 AM, Richard Leitner - SKIDATA
<Richard.Leitner at skidata.com> wrote:
> Hi Yocto-Community,
> as the subject already says I've a problem with my kernel recipe after the "migration" from the Dylan to the Dora (10.0.1) branch.
> I've tried the 10.0.1 release tag as well as the current dora master (50e9ccb2aff7b9f9dca4fda99a6832c60f64de3b).
>
> The kernel recipe I'm using is derived from the skeleton:
> DESCRIPTION = "Linux Kernel"
> SECTION = "kernel"
> LICENSE = "GPLv2"
> LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
> inherit kernel
> KSRC = "/home/leri/VCS/git/linux"
> KBRANCH = "master"
> SRC_URI = "git://${KSRC};protocol=file;branch=${KBRANCH};name=kernel;nocheckout=1"
> SRCREV = "2014_03_07"
> PR = "sd_15.2"
> LINUX_VERSION = "${PV}"
> LINUX_VERSION_EXTENSION = "-${PR}+${SRCREV}"
> COMPATIBLE_MACHINE = "skidata-harmony|smartcpu"
> KERNEL_IMAGETYPE = "uImage"
> SRC_URI += "file://defconfig"
> require recipes-kernel/linux/linux-yocto.inc
>
>
> This recipe was working well with the Dylan branch and following changes:
> -SRC_URI = "git://${KSRC};protocol=file;branch=${KBRANCH};name=kernel;nocheckout=1"
> +SRC_URI = "git://${KSRC};protocol=file;branch=${KBRANCH};name=kernel"
> +S = "${WORKDIR}/git"
>
>
> When compiled with the dora branch the kernel hangs at "Starting kernel..." and doesn't start:
> ## Booting kernel from Legacy Image at 00000000 ...
>    Image Name:   Linux-3.1.10-sd_15.2
>    Image Type:   ARM Linux Kernel Image (uncompressed)
>    Data Size:    3181616 Bytes = 3 MiB
>    Load Address: 00008000
>    Entry Point:  00008000
>    Verifying Checksum ... OK
>    Loading Kernel Image ... OK
> OK
>
> Starting kernel ...
>
>
> I've already looked through the migration notes in the manual but I'm unable to find any hints...
> Are there any ideas why the kernel doesn't start with the Dora branch?

you don't mention anything about gcc, so assuming you are using the
'default' gcc for each release, dylan has 4.7, and dora has 4.8. On a
couple of ARM platforms, i have seen similar issue when using gcc-4.8
with old kernel (<v3.4).

the following linux kernel patches were used to fix the boot problem:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=455bd4c430b0c0a361f38e8658a0d6cb469942b5
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=418df63adac56841ef6b0f1fcf435bc64d4ed177

They should cleanly apply to v3.1 which you seem to be using.

cheers,
nico