[yocto] Yocto/Poky with external linaro toolchain

[Thomas Kaufmann]

Hi

I started porting an existing linux system to the latest yocto base. The hardware TI am 335x based.
I want to use the external linaro toolchains. Since I use an existing 3.2 linux kernel as well as an older u-boot, I created a own machine and distro configuration. I succeed to build and run the target, so far so good.

To incorporate the external toolchains I added

TCMODE = "external-linaro"
EXTERNAL_TOOLCHAIN = "/<homedir>/gcc-linaro-5.1-2015.08-x86_64_arm-linux-gnueabihf"

to the local.conf file and

meta-linaro/meta-linaro-toolchain

to the BBLAYERS in bblayers.conf. meta-linaro was cloned using git.
For my "legacy" packages I adjust "EXTERNAL_TOOLCHAIN" to a gcc-4.9 version, this seems to work and everything compiles.

Now my next step is to create an SDK distribution.
When I do do_populate_sdk with bitbake for my image, however the process seems to compile a new cross compiler for the target as well as various qemu things and also newer kernel releases.

Is this the preferred way to integrate the linaro toolchain into poky? Can anybody share their experience? I find various presentations and snippets about this topic, but nothing is complete.
How do I create a SDK distribution which does not feature any QEMU (I want to deploy to target hardware) and uses the existing prebuilt toolchain? Build host and target sdk host would be x86_64.

Any recommendations are welcome.

regards Thomas Kaufmann
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