[yocto] Accelerate kernel module built in eSDK?

[Zhaolong Zhang]

On 2018/12/28 19:40, richard.purdie at linuxfoundation.org wrote:
> On Fri, 2018-12-28 at 18:19 +0800, Zhaolong Zhang wrote:
>> Hi Experts,
>>
>> Building out-of-tree kernel modules in eSDK will trigger a new
>> rebuilding of kernel, which consumes lots of time.
>> Is it possible to cache the do_shared_workdir() task in sstate-cache
>> and ship it within eSDK? And how?
>>
>> Or is there other method to accelerate?
>>
>> Thanks in advance.
> 
> It is possible but it means creating a tarball of all the kernel source
> and build artefacts. Usually its just as quick to extract new kernel
> source and build it than it is to store this and extract it. The sstate
> object would be huge.
> 

Hi Richard,

Thanks for responding!

Isn't sstate object also a tarball for them? Creating another tarball 
would be a hacking and how can I let module.bbclass know that the kernel 
source and build artifact are ready, without sstate hashes?

Regards,
Zhaolong

> Cheers,
> 
> Richard
>