[yocto] The best way to change target architecture

[Zhuoqun Cheng]

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.

Thanks a lot!
Tom.
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