[Buildroot] [PATCH v2 3/3] pru-sample: add sample PRU application

[Ash Charles]

Hi,
On Sat, Nov 26, 2016 at 6:22 AM, Arnout Vandecappelle <arnout at mind.be> wrote:
>  The intention here was not to create a new package, but rather to allow the
> installation of the examples provided in pru-software-support. I.e. add a config
> option "PRU_SOFTWARE_SUPPORT_INSTALL_EXAMPLES". Or rather, add a
> pru-software-support target package for the examples (the firmware files are to
> be installed on the target so it has to be a target package).
Okay.  How best to implement this?  Currently, I have
PRU_SOFTWARE_SUPPORT as a host package (Config.in.host) as previously
discussed.  In the same directory, I can add a PRU_SOFTWARE_EXAMPLES
Config.in for a target package that depends on the host package i.e. a
user will select PRU support and then, if they wish, can choose to
include the examples pack for their target.  Then, I just need to add
some steps to the existing makefile to build out the examples too.

>
>  Obviously, only 1 firmware binary can be installed. So you have the following
> options:
> - Support only one example.
> - Add config options for all the examples and let the user select it.
> - Install examples, but not as am335x-pru0-fw, but in a pru-examples
> subdirectory, leaving it up to the user to copy/link it to the correct name for
> firmware loading. Mention in the help text how to do that.
What is the best place for the examples directory tree to be installed
/opt/pru-examples?
Is it reasonable to support users who wish to select their desired
example firmware before filesystem creation (firmware can be loaded
directly on boot & maybe they have a read-only rootfs) rather than on
first boot?  I think this means they'd have to make the copy in the
output/target directory and then rerun make to finalize the rootfs.
What is the best way to give a user instructions? (Sorry for all the
questions...buildroot neophyte)

--Ash