Bare metal Code to test Big Little on Arndale Octa (5420)

Bare metal Code to test Big Little on Arndale Octa (5420)

[armdev]

Hi,

We are trying a write a bare metal test code for Switching tasks from A15 Core to A7 core.
As of now we have this article to start with https://lwn.net/Articles/481055/.

Can the list help us in 
a) Where (file/directory ) in Linux kernel code that does the switching code (arch specific) for 5420 ?
b) Any test cases for big little on 5420 ?


-Regards
armdev team

Re: Bare metal Code to test Big Little on Arndale Octa (5420)

[armdev]

Please comment

On 28-Apr-2014, at 11:21 am, armdev <armdev.ftm@gmail.com> wrote:

> Hi,
> 
> We are trying a write a bare metal test code for Switching tasks from A15 Core to A7 core.
> As of now we have this article to start with https://lwn.net/Articles/481055/.
> 
> Can the list help us in 
> a) Where (file/directory ) in Linux kernel code that does the switching code (arch specific) for 5420 ?
> b) Any test cases for big little on 5420 ?
> 
> 
> -Regards
> armdev team

Re: Bare metal Code to test Big Little on Arndale Octa (5420)

[Tomasz Figa]

Hi,

On 28.04.2014 07:51, armdev wrote:
> Hi,
>
> We are trying a write a bare metal test code for Switching tasks from A15 Core to A7 core.
> As of now we have this article to start with https://lwn.net/Articles/481055/.
>
> Can the list help us in
> a) Where (file/directory ) in Linux kernel code that does the switching code (arch specific) for 5420 ?

There is no mainline support for big.LITTLE on Exynos5420 yet. There 
were some patches [1] posted for MCPM support, though.

[1] http://www.spinics.net/lists/arm-kernel/msg321666.html

> b) Any test cases for big little on 5420 ?

I'm not aware of any, but Exynos5 is not the primary platform I work on.

Best regards,
Tomasz

Re: Bare metal Code to test Big Little on Arndale Octa (5420)

[armdev]

On 02-May-2014, at 11:13 pm, Tomasz Figa <tomasz.figa@gmail.com> wrote:

> Hi,
> 
> On 28.04.2014 07:51, armdev wrote:
>> Hi,
>> 
>> We are trying a write a bare metal test code for Switching tasks from A15 Core to A7 core.
>> As of now we have this article to start with https://lwn.net/Articles/481055/.
>> 
>> Can the list help us in
>> a) Where (file/directory ) in Linux kernel code that does the switching code (arch specific) for 5420 ?
> 
> There is no mainline support for big.LITTLE on Exynos5420 yet. There were some patches [1] posted for MCPM support, though.
> 
Tomasz we are trying to add support of Big Little in our RTOS, can you please advice/suggest how to get reference code / documentation.
We have odroid xu and arndale octa. 

> [1] http://www.spinics.net/lists/arm-kernel/msg321666.html
> 
>> b) Any test cases for big little on 5420 ?
> 
> I'm not aware of any, but Exynos5 is not the primary platform I work on.
> 
> Best regards,
> Tomasz

Re: Bare metal Code to test Big Little on Arndale Octa (5420)

[Amit Kucheria]

Hi,

No public code has been released to boot all 8 cores on the 5420. You
can only see the A15s.

You could however, if you are interested, get IKS[1] working by
integrating the MCPM patches posted by Samsung and the IKS patches
that are already in mainline.

Regards,
Amit
[1] http://lwn.net/Articles/481055/

On Mon, Apr 28, 2014 at 11:21 AM, armdev <armdev.ftm@gmail.com> wrote:
> Hi,
>
> We are trying a write a bare metal test code for Switching tasks from A15 Core to A7 core.
> As of now we have this article to start with https://lwn.net/Articles/481055/.
>
> Can the list help us in
> a) Where (file/directory ) in Linux kernel code that does the switching code (arch specific) for 5420 ?
> b) Any test cases for big little on 5420 ?
>
>
> -Regards
> armdev team
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> linaro-kernel@lists.linaro.org
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