[OE-core] [RFC PATCH] u-boot: remove UBOOT_MACHINE and COMPATIBLE_MACHINES

[Darren Hart]

On 05/17/2011 04:15 PM, Richard Purdie wrote:
> On Tue, 2011-05-17 at 16:00 -0700, Darren Hart wrote:
>> oe-core does not define any machines, so it does not make sense to
>> add machine specific information in the oe-core u-boot recipe and
>> infrastructure.
>>
>> Since every machine wishing to use the u-boot recipe would need to add itself to
>> COMPATIBLE_MACHINES, typically via a bbappend recipe, the mechanism loses any
>> utility it may have had and unecessarily complicates using the u-boot recipe. By
>> removing it, we simplify the task of adding support for new machines.
> 
> NAK.
> 
> This break usability of things like "bitbake world" since all of a
> sudden it will try and build u-boot in cases where it makes no sense
> (qemu* machines for example).

OK, I thought there might be something like that surrounding
COMPATIBLE_MACHINE, thus the RFC.

> 
> I know it sounds strange but we do want this recipe enabled on a case by
> case basis (and we have the beagleboard as a reference platform using it
> which is handy). This means the default of no supported machine is
> correct even if it looks odd.
> 
> Having the recipe deselect itself (raise a skip parsing event) if
> UBOOT_MACHINE isn't set instead of using COMPATIBLE_MACHINE would be
> acceptable though.

That sounds promising. I'd like to avoid having to create a
u-boot_git.bbappend everytime you want to use u-boot. Is there an
example you can think of that does this? greping for "deselect" and
"skip pars" didn't yield any results.

Thanks,

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel