Cross building for other architectures is difficult, because all the
tools like "ldd", "modprobe", etc. would have to be cross tools.
Kernel could be solved by specifying the kernel version and having
that version installed.
That isn't the best, though I understand the rationale behind this now.
There was another reason I asked this: the module which I am currently
developing for login to LUKS with smartcard tokens requires the core
modules (smartcard udev drivers as well as core executables) to be
compiled/build with certain options (the standard/desktop-related
builds will NOT work - i.e. using inst_* from dracut_functions on
these on the already installed libraries/executables will NOT work),
so for this module I need to carry quite a few .so and executable
files, which will be architecture-dependent and have to be compiled in
advance.
A bit further on this.
I was able to build initramfs, which is for a different architecture
from the host by using image built with kickstart.
Kickstart used dracut resources on the host, but built all the
dependencies within the image itself which had a different architecture
(my development host is on FC13 and x86_64, the image built was for
P2-specific machine using custom-built-and-heavily-patched kernel, i.e.
i686 architecture). It runs beautifully - cross-building is indeed
possible!
In my new module I did insert architecture-probing code to install
different architecture-dependent libraries, which isn't ideal, but it
does the trick - for now.
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