On 12/11/14, 12:55 AM, Mike Looijmans wrote:
On 12/10/2014 08:00 PM, Khem Raj wrote:
On Dec 10, 2014, at 10:52 AM, Koehler, Yannick (HP Networking)
<yannick.koeh...@hp.com> wrote:
Can Yocto build for example in a single bitbake call an image for x86, ppc,
arm, others? Or is the call to bitbake limited to a single architecture? And
if so, how?
I see that lots of *-native package are built, and I guess is that for each
machine/os those would be reused, as such, it appears it would be a benefit to
be able to build multiple package version for different
architecture/distro/machine in a single invocation of bitbake.
parallel multi-machine builds have been discussed but not thought of worth
doing. you could however share
lot of common packages among machines sequentially.
[...]
A more convincing use-case for multi-machine building is the emerging of
"hybrids". The little/big architecture that puts different versions of ARM
CPUs into a single machine is one example, the OMAPs with the DSP and PRUs are
another. Boards with FPGAs can have several CPU architectures running on a
single board. One could imagine that one would want to build the software for
all these subsystems in a single call, and that one bitbake process would be
managing that the build system gets properly used.
Currently, these hybrids have to invoke bitbake for each subsystem, probably
needlessly regenerating binaries, and once more for the one image to find them
all and in darkness bind them...
From a userspace perspective, this is more or less solved with the multilib
configurations. Perhaps it would be possible to implement some kind of hybrid
kernel configuration using the same type of multilib setup. (Note, this would
be new work, it's not something we have today.)
--Mark
Met vriendelijke groet / kind regards,
Mike Looijmans
System Expert
TOPIC Embedded Systems
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