imx8mm-evk does not boot kernel 5.16

imx8mm-evk does not boot kernel 5.16

[Fabio Estevam]

Hi,

I am able to boot Linux 5.15.14 on an imx8mm-evk running U-Boot
2022.01 just fine.

However, if I try to boot a 5.16 kernel, the boot fails in most of the
attempts (like in 80% of the boots. It does boot completely in some of
the attempts).

Starting kernel ...
 (hangs here)

Using earlycon I see that it hangs around the imx-sdma driver load:
[    0.681930] imx-sdma 302c0000.dma-controller: Direct firmware load
for imx/sdma/sdma-imx7d.bin failed with error -2
[    0.689628] imx-sdma 302c0000.dma-controller: external firmware not
found, using ROM firmware
[    0.689635] imx-sdma 302b0000.dma-controller: external firmware not
found, using ROM firmware

Tried to disable the imx-sdma driver and the hang also happens, so it
is something else that causes the hang.

If I use U-Boot from NXP the problem does not happen.

I tried to select the imx8m power domain options:

--- a/configs/imx8mm_evk_defconfig
+++ b/configs/imx8mm_evk_defconfig
@@ -72,6 +72,8 @@ CONFIG_MII=y
 CONFIG_PINCTRL=y
 CONFIG_SPL_PINCTRL=y
 CONFIG_PINCTRL_IMX8M=y
+CONFIG_POWER_DOMAIN=y
+CONFIG_IMX8M_POWER_DOMAIN=y
 CONFIG_DM_PMIC=y
 CONFIG_SPL_DM_PMIC_PCA9450=y
 CONFIG_DM_REGULATOR=y

but it did not help.

The same behavior is seen with the top of tree U-Boot.

Does anyone have any ideas as to what is missing?

Thanks,

Fabio Estevam

Re: imx8mm-evk does not boot kernel 5.16

[Marcel Ziswiler]

Hi Fabio

On Fri, 2022-01-14 at 15:00 -0300, Fabio Estevam wrote:
> Hi,
> 
> I am able to boot Linux 5.15.14 on an imx8mm-evk running U-Boot
> 2022.01 just fine.
> 
> However, if I try to boot a 5.16 kernel, the boot fails in most of the
> attempts (like in 80% of the boots. It does boot completely in some of
> the attempts).
> 
> Starting kernel ...
>  (hangs here)
> 
> Using earlycon I see that it hangs around the imx-sdma driver load:
> [    0.681930] imx-sdma 302c0000.dma-controller: Direct firmware load
> for imx/sdma/sdma-imx7d.bin failed with error -2
> [    0.689628] imx-sdma 302c0000.dma-controller: external firmware not
> found, using ROM firmware
> [    0.689635] imx-sdma 302b0000.dma-controller: external firmware not
> found, using ROM firmware
> 
> Tried to disable the imx-sdma driver and the hang also happens, so it
> is something else that causes the hang.
> 
> If I use U-Boot from NXP the problem does not happen.
> 
> I tried to select the imx8m power domain options:
> 
> --- a/configs/imx8mm_evk_defconfig
> +++ b/configs/imx8mm_evk_defconfig
> @@ -72,6 +72,8 @@ CONFIG_MII=y
>  CONFIG_PINCTRL=y
>  CONFIG_SPL_PINCTRL=y
>  CONFIG_PINCTRL_IMX8M=y
> +CONFIG_POWER_DOMAIN=y
> +CONFIG_IMX8M_POWER_DOMAIN=y
>  CONFIG_DM_PMIC=y
>  CONFIG_SPL_DM_PMIC_PCA9450=y
>  CONFIG_DM_REGULATOR=y
> 
> but it did not help.
> 
> The same behavior is seen with the top of tree U-Boot.
> 
> Does anyone have any ideas as to what is missing?

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...

[1] https://lore.kernel.org/lkml/20220114141507.395271-1-marcel@ziswiler.com/

> Thanks,
> 
> Fabio Estevam

Cheers

Marcel

Re: imx8mm-evk does not boot kernel 5.16

[Fabio Estevam]

Hi Marcel,

On Fri, Jan 14, 2022 at 3:10 PM Marcel Ziswiler
<marcel.ziswiler@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

Thanks

Re: imx8mm-evk does not boot kernel 5.16

[Marcel Ziswiler]

Hi Fabio

On Fri, 2022-01-14 at 16:44 -0300, Fabio Estevam wrote:
> Hi Marcel,
> 
> On Fri, Jan 14, 2022 at 3:10 PM Marcel Ziswiler
> <marcel.ziswiler@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.

I am always using imx_5.4.47_2.3.0 resp. for our board our fork thereof which defaults to a different UART.

> When using the mainline TF-A  (v2.5 or v2.6) the board hangs with 5.16

I have to admit that I never tried mainline TF-A so far.

> Thanks

Thank you.

Cheers

Marcel

Re: 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@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.

Re: imx8mm-evk does not boot kernel 5.16

[Tim Harvey]

On Fri, Jan 14, 2022 at 11:44 AM Fabio Estevam <festevam@gmail.com> wrote:
>
> Hi Marcel,
>
> On Fri, Jan 14, 2022 at 3:10 PM Marcel Ziswiler
> <marcel.ziswiler@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
>

Interesting. Can you give us a breakdown of pros and cons of using
mainline TF-A vs NXP's? I'm not clear if NXP has been actively pushing
their changes up or not and haven't had time to follow the commits for
either project.

Best regards,

Tim

Re: imx8mm-evk does not boot kernel 5.16

[Fabio Estevam]

Hi Tim,

On Mon, Jan 17, 2022 at 2:09 PM Tim Harvey <tharvey@gateworks.com> wrote:

> Interesting. Can you give us a breakdown of pros and cons of using
> mainline TF-A vs NXP's? I'm not clear if NXP has been actively pushing
> their changes up or not and haven't had time to follow the commits for
> either project.

I am not following TF-A i.MX development in upstream, so I cannot
comment myself.

Added Jacky on Cc, who is involved with i.MX TF-A development and
could probably explain.

RE: imx8mm-evk does not boot kernel 5.16

[Jacky Bai]

> Subject: Re: imx8mm-evk does not boot kernel 5.16
> 
> Hi Tim,
> 
> On Mon, Jan 17, 2022 at 2:09 PM Tim Harvey <tharvey@gateworks.com>
> wrote:
> 
> > Interesting. Can you give us a breakdown of pros and cons of using
> > mainline TF-A vs NXP's? I'm not clear if NXP has been actively pushing
> > their changes up or not and haven't had time to follow the commits for
> > either project.
> 

I will check what's wrong, the mainline TF-A should work before. Although there's some code gap between downstream vs upstream,
the basic function should be ok before, and some community guys have used it for their project for a while.

BR
Jacky Bai
> I am not following TF-A i.MX development in upstream, so I cannot comment
> myself.
> 
> Added Jacky on Cc, who is involved with i.MX TF-A development and could
> probably explain.