imx8mm-evk does not boot kernel 5.16

[Frieder Schrempf]

On 14.01.22 20:44, Fabio Estevam wrote:
> Hi Marcel,
> 
> On Fri, Jan 14, 2022 at 3:10 PM Marcel Ziswiler
> <marcel.ziswiler at toradex.com> wrote:
> 
>> Strange, remember, I am working on Verdin iMX8M Mini support [1] and run that stuff more or less daily.
>> However, as you can see in that patch series, I build the imx-sdma driver now as a module just like already
>> merged for imx_v6_v7_defconfig. As I also do have an imx8mm-evk laying around somewhere I can give that a try
>> as well. I keep you posted...
> 
> Just noticed that when using the TF-A from NXP: imx-atf branch:
> imx_5.4.47_2.2.0 the 5.16 kernel boots fine.
> 
> When using the mainline TF-A  (v2.5 or v2.6) the board hangs with 5.16

I remember having lockup issues with the mainline TF-A and i.MX8MM when
it came to power domain handling (with older kernels and preliminary
power domain support). I never tracked this down, but switched to the
NXP TF-A for the time being.

IIRC the mainline TF-A doesn't enable the USB power domains per default,
while the NXP TF-A does and there are probably other differences. With
the latest GPCv2 and BLK-CTRL code in the kernel it should work either
way, but there still might be some unresolved problems.