armv7R: K3: am654: U-Boot

[Lokesh Vutla]

Hi Michal,

On 14/09/20 8:29 pm, Michal Simek wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi Tom,
> 
> On 14. 09. 20 16:47, Tom Rini wrote:
>> On Mon, Sep 14, 2020 at 04:42:56PM +0200, Michal Simek wrote:
>>
>>> Hi Tom and Lokesh,
>>>
>>> I have been validating R5 on ZynqMP if u-boot is still working
>>> with latest u-boot. I found that you have added support for
>>> platform in subject. Can you please tell me how you use u-boot on
>>> R5s? Have you tried to run Linux on it too?

The whole boot flow is captured here[0]. See if it helps

[0] https://gitlab.denx.de/u-boot/u-boot/-/blob/master/board/ti/am65x/README

No, we never tried Linux on R5. But I did verify U-Boot(non-SPL) on R5 just for
experimentation sake, and it works well. One hurdle I faced was that by default
any region above 0x8000_0000 is marked as execute never. Need to setup right MPU
configurations before jumping to U-Boot/Linux.

>>
>> I'll let Lokesh point to where the design of the am65x platform has
>> been talked about.  But I can confirm that the combination of
>> am65x_evm_r5 + am65x_evm_a53 are part of my regular HW testing
>> cycle that I do for each PR.
> 
> Do you have any logs from that?

I don't think anything interesting will be obtained from R5 SPL logs. Just the
SPL banner and boot device. Anything specific you are looking for? I am on a
vacation. If you insist, I can get logs once I am back from vacation (i.e.next
week).

> I see that you use SPL and also enabling booting Linux.
> Are you also testing booting to OS?

No.

> Are you also supporting booting R5 from A53 and vice versa?

Yes, R5 starting A53 and A53 starting R5 are supported.

Thanks and regards,
Lokesh

> 
> Thanks,
> Michal
> -----BEGIN PGP SIGNATURE-----
> 
> iF0EARECAB0WIQQbPNTMvXmYlBPRwx7KSWXLKUoMIQUCX1+FSQAKCRDKSWXLKUoM
> ITiyAJ9M52U2LBBxXRnOYj/LWlhACV7lLgCePxQsoElEN2Qqp8F5CDjVbRhnhmc=
> =pOxX
> -----END PGP SIGNATURE-----
>