[OE-core] Going beyond MACHINE?

[Mike Looijmans]

On 10/20/2014 02:04 PM, Richard Purdie wrote:
> On Mon, 2014-10-20 at 13:55 +0200, Mike Looijmans wrote:
>> The short version of my question: Can I define a "level" that goes beyond MACHINE?
>>
>> My problem in detail (and I suspect there are more systems with similar problems):
>>
>> I have an SOC called "topic-miami". There are currently two variants: The 7015
>> and 7030. They are identical but for one component: They have a different FPGA
>> part (the 7030 is bigger and faster).
>> Both run exactly the same kernel and bootloader, and all other software and
>> libraries are exactly the same.
>>
>> Currently I have MACHINE="topic-miami-7015" and then SOC_FAMILY="topic-miami"
>> so I can use "topic-miami" as override word for all packages.
>>
>> However, this means I get two kernels, two bootloaders, etc. even though they
>> are exactly the same.
>>
>> The only package that currently differs is the one that delivers the
>> bitstream(s) for the FPGA. These are big, too big to fit bitstreams for both
>> models into flash and leave room for applications, so just installing both
>> into the rootfs and pick the correct one at boot time is not really an option.
>>
>> Maybe I could define some extra PACKAGE_ARCH for the bitstreams (which make
>> sense, as this is sort of firmware for a different platform). But how would a
>> user then pick the right value for this variable, since MACHINE seems to be
>> the only thing he can really choose?
>>
>> Any thoughts and ideas are welcome...
>
> One possible solution would be to inject another PACKAGE_ARCH (as the
> intel gmgd graphics does for example), then mark the MACHINE specific
> packages as being that package architecture. They'd then only get built
> once per package architecture yet your bitstreams would still be machine
> specific. You could probably do the "remarking" using anonymous python
> injected at the machine level.

Sounds doable, but I can't find anything about "intel gmgd" in any layer. 
Which machine are you referring to here?




Met vriendelijke groet / kind regards,

Mike Looijmans

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