Branch/Steps required to build linux kernel for Cortex R52 FVP

[Ayan Kumar Halder]

Hi Vladimir,

On 31/03/2022 16:54, Vladimir Murzin wrote:
> Hi,
>
> On 3/31/22 12:04 PM, Ayan Kumar Halder wrote:
>> Hi All,
>>
>> Refer 
>> https://developer.arm.com/tools-and-software/simulation-models/fixed-virtual-platforms 
>> for Cortex R52 FVP
>>
>> For Cortex R82 FVP, I can see the steps 
>> https://community.arm.com/oss-platforms/w/docs/633/release-1-single-core
>>
>> If there are any steps available to build linux on Cortex R52 based 
>> SoC or other emulator, please let me know.
>>
>> The only relevant link I got was 
>> https://git.yoctoproject.org/poky/plain/meta/conf/machine/include/arm/armv8r/tune-cortexr52.inc 
>> , but could not find instructions.
>
> I do run uCLinux on Cortex-R52 occasionally and I'm not aware of any 
> instructions publicly
> available. IIRC, Cortex R52 FVP is variant of VExpress, so the show 
> stopper is that VExpress
> guarded (indirectly via ARCH_MULTIPLATFORM) with MMU=y. Another 
> missing bit is device tree
> (especially memory map and interrupt map).

That is great to hear.

As I read in ARM DDI 0568A.c ID110520 Arm ARM supplement for Armv8 for 
AArch32, it says the Real time profile supports PMSA based on MPU. So I 
am assuming it does not support MMU.

I did not see how you found that "Cortex R52 FVP is variant of VExpress".

>
> Unfortunately (or fortunately) I'm at beginning of my sabbatical 
> month, so cannot really
> help, yet you can try ARM Support - they might have some instructions 
> (or they come to me).
>
> In case you have strong interest I can find bandwidth (once I'm back) 
> to submit support for
> AN536 ("Example Cortex™-R52x2 subsystem FPGA") for MPS3, so we get 
> R-class representative
> mainline ;)

It will be great to see it mainline. Let's touch base when you are back.

To give a bit more context, I am in the process of porting Xen on Cortex 
R52 (using FVP).

I am using 
https://github.com/zephyrproject-rtos/zephyr/pull/43581/commits (as a 
reference for running an app on Cortex R52 FVP) and 
https://gitlab.com/xen-project/fusa/xen-integration/-/merge_requests/15 
to see how MPU is supported.

I will be needing some kernel port to run it as a Dom0 kernel for Xen. 
So having the uCLinux will be awesome.

- Ayan

>
> Cheers
> Vladimir
>
>
>>
>> Kind regards,
>>
>> Ayan
>>
>>
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>