[OE-core] Why does building an image for machine X delete the bootloader for machine Y?

[Mike Looijmans]

On 11/26/2014 12:31 PM, Paul Eggleton wrote:
> Hi Mike,
>
> On Wednesday 26 November 2014 09:19:13 Mike Looijmans wrote:
>> I do a:
>>
>> MACHINE=X bitbake my-image
>>
>> This DEPENDS on a virtual bootloader, which will produce a BOOT.BIN file in
>> the deploy directory, which is tmp-glibc/deploy.images/X/
>>
>> If I then do a:
>>
>> MACHINE=Y bitbake my-image
>>
>> the BOOT.BIN in tmp-glibc/deploy.images/X/ is suddenly gone!
>>
>> If i do a
>>
>> MACHINE=X bitbake my-image
>>
>> then the the BOOT.BIN in tmp-glibc/deploy.images/Y/ is suddenly gone, and
>> the one for the X machine appears again. The bootloader recipe is not being
>> rebuilt at all.
>>
>> The machines have the same MACHINE_ARCH, they differ on only minor points
>> (the FPGA).
>>
>> What is going on here?
>
> I can't be sure, but my guess is the recipe is not marked as being machine-
> specific (i.e. PACKAGE_ARCH is not set to "${MACHINE_ARCH}" - is that the
> case?) but there is still some variable dependency on a variable that has a
> machine-specific value. If it's not obvious from the recipe, check if there are
> two sets of tasks for the bootloader recipe in the sstate cache, and then use
> bitbake-diffsigs to compare the sigdata/siginfo files.

MACHINE is actually "topic-miami-florida-med-xc7z015" or 
"topic-miami-florida-med-xc7z030"

Both machines have MACHINE_ARCH = "topic_miami_florida_med" since they only 
differ in the FPGA subsystem, but share all the rest (kernel, bootloader, etc).

Is it forbidden to share $MACHINE_ARCH between $MACHINEs? (And if so, why does 
MACHINE_ARCH even exist?)

The BSP layer for the topic-miami machines is here (yes, you can build OE or 
Yocto images with it, but I have yet some more work to do to make it a proper 
BSP...):
https://github.com/topic-embedded-products/meta-topic




Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


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