[yocto] The best way to change target architecture

Khem Raj raj.khem at gmail.com
Tue Jun 6 07:05:37 PDT 2017

On Tue, Jun 6, 2017 at 5:42 AM, Zhuoqun Cheng <czq at bu.edu> wrote:
> Hi Yocto Experts,
> I'm fairly new to Yocto and I've already tried my best to search for
> answers, but not happy with what I found.
> So here's the situation I've got:
> I'm using yocto to build the intel aero board image, following this link:
> https://github.com/intel-aero/meta-intel-aero/wiki/Quickstart-Guide#yocto-for-intel-aero
> Everything worked fine, until I wanted to change the target architecture
> from the default 64-bit x86 to 32-bit x86. What I did is three steps:
> 1. do a clean: bitbake -c clean intel-aero-image
> 2. change configuration, from "require conf/machine/intel-corei7-64.conf" to
> "require conf/machine/intel-core2-32.conf" in the file
> "meta-intel-aero/conf/machine/intel-aero.conf"
> 3. do a build: bitbake intel-aero-image
> Unfortunately, I got loads of errors, like "ERROR:
> linux-yocto-4.4.60+gitAUTOINC+2cc78e92f4-r0 do_package_qa: QA Issue:
> Architecture did not match (3 to 62) on
> work/core2-32-intel-common-poky-linux/linux-yocto/4.4.60+gitAUTOINC+2cc78e92f4-r0/packages-split/kernel-module-gspca-kinect/lib/modules/4.4.60-yocto-standard/kernel/drivers/media/usb/gspca/gspca_kinect.ko
> [arch]
> "
> Then I tried deleting all the files in the packages-split directory and
> rebuilding. It passed building the kernel (even though failed because some
> other package's arch mismatch), but those file I deleted never got generated
> again! Now I'm a bit worried.
> So I guess my question is:
> What is the correct procedures to follow to reuse a poky folder (already
> built once) for a different target architecture? I'm happy to accept any
> links and suggested readings.

there already is a definition for 32bit machine, if you want a pure
32bit rootfs all you need
to do is set MACHINE = "intel-core2-32" in local.conf

> Thanks a lot!
> Tom.
> --
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