linux-kernel - Re: ARM iMX6sx board fails to boot with kernel 6.17

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Message-ID: <CAOMZO5Cmxqq6K4k7_yPjGOtMTOgv7WmpN9O2dZiX+UWies8mow@mail.gmail.com>
Date: Tue, 7 Oct 2025 18:29:35 -0300
From: Fabio Estevam <festevam@...il.com>
To: Sergey Organov <sorganov@...il.com>
Cc: linux-kernel@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>, 
	Shawn Guo <shawnguo@...nel.org>, "Rob Herring (Arm)" <robh@...nel.org>
Subject: Re: ARM iMX6sx board fails to boot with kernel 6.17

Hi Sergey,

On Tue, Oct 7, 2025 at 6:17 PM Sergey Organov <sorganov@...il.com> wrote:
>
> Please see attached minimum DTS. Maybe it misses something? Shouldn't
> DTS describe how eMMC chip is powered, provided it's powered from NXP
> MMPF0100F6ANES PMIC? I didn't find any hints in other DTS'es.

Yes, the dts should describe the eMMC power supplies.

The properties are: vmmc-supply and vqmmc-supply.

Check arch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi for reference.

> The point of hang is not entirely deterministic either, that suggests
> it's some power problem indeed. It may hang after random line among the
> following depending on exact build and sometimes even from run-to-run:
>
> ...
> mmc0: SDHCI controller on 219c000.mmc [219c000.mmc] using ADMA
> Loading compiled-in X.509 certificates
> clk: Disabling unused clocks
> PM: genpd: Disabling unused power domains

Does it hang if you pass "pm_genpd_ignore_unused" and
"clk_ignore_unused" in the kernel command line?

> check access for rdinit=/init failed: -2, ignoring
> Waiting for root device /dev/mmcblk0p2...
>
> Also, I just tried to compile entire kernel with -DDEBUG, and it starts
> to see the eMMC, though still hangs not ever mounting the root FS:

I saw Ulf's response about a potential regression in 6.17.

Do you see the hang with 6.16?