[EXT] Re: [PATCH v2 2/2] imx: Support i.MX91 11x11 FRDM board

[Fabio Estevam]

Hi Joseph,

On Fri, Dec 5, 2025 at 12:12 AM Joseph Guo (OSS) <qijian.guo at oss.nxp.com> wrote:

> I understand your requirement. But as I said, the IO voltage switch only
> happen on u-boot stage, so it is kind of u-boot specific requirement.
> So you mean we need to add this delay control into kernel driver, and
> add this property into kernel dts even kernel stage didn't need to
> control it?

What happens if U-Boot boots from a medium other than the SD card
(eMMC, USB download mode, SPI, etc.) and mounts the rootfs from the SD
card?

Will it fail to mount the rootfs mount due to the lack of this custom
SD card property?

This mechanism is not fully understood, I'm afraid.

Why is it used only on some imx93 boards and imx8mm-evk?

I'm trying to avoid perpetuating this hack.

> Since we don't have this issue on FRDM-IMX91. How about I remove this
> property on this commit first. And we can have further discussion on how
> to resolve this property.

That sounds great to me.