Re: ARM iMX6sx board fails to boot with kernel 6.17

[Sergey Organov <sorganov@gmail.com>]

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Hi Fabio,

Fabio Estevam <festevam@gmail.com> writes:

> On Mon, Oct 6, 2025 at 6:22 PM Sergey Organov <sorganov@gmail.com> wrote:
>
>> It is built form multiple .dtsi, so I figure I attach the one after
>> pre-processing stage. Please let me know if you'd prefer I rather
>> manually insert all the custom .dtsi into a single .dts, and send that
>> one instead.
>
> This format is hard to follow.
>
> To make things easier for debugging, you could create a minimal board
> dts file with only UART and eMMC nodes to reproduce the problem.

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.

> It's not clear to me the relationship between the ANATOP regulators
> and the eMMC power on your board.

Sheer mystery for me.

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
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:

mmc0: SDHCI controller on 219c000.mmc [219c000.mmc] using ADMA
Loading compiled-in X.509 certificates
mmc0: new high speed DDR MMC card at address 0001
mmcblk0: mmc0:0001 IX2964 58.3 GiB
 mmcblk0: p1 p2 p3 p4 < p5 p6 >
mmcblk0boot0: mmc0:0001 IX2964 4.00 MiB
mmcblk0boot1: mmc0:0001 IX2964 4.00 MiB
mmcblk0rpmb: mmc0:0001 IX2964 4.00 MiB, chardev (246:0)
clk: Disabling unused clocks
PM: genpd: Disabling unused power domains
check access for rdinit=/init failed: -2, ignoring

-- Sergey Organov


[-- Attachment #2: troublesome minimum dts --]
[-- Type: text/plain, Size: 1432 bytes --]

/dts-v1/;

#include "../imx6sx.dtsi"

/ {
	compatible = "javad,imx6sx", "fsl,imx6sx";

	chosen {
		stdout-path = &uart1;
	};

	aliases {
		mmc0 = &usdhc4;
		mmc1 = &usdhc3;
		mmc2 = &usdhc2;
		mmc3 = &usdhc1;
	};

	memory@80000000 {
		device_type = "memory";
		reg = <0x80000000 0x40000000>;
	};

};

&usdhc4 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_usdhc4>;
	bus-width = <8>;
	non-removable;
	keep-power-in-suspend;
	status = "okay";
};

&uart1 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_uart1>;
	dma-names = "";
	uart-has-rtscts;
	status = "okay";
};

&iomuxc {
	pinctrl-names = "default";
	imx6x-sdb {
		pinctrl_usdhc4: usdhc4grp {
			fsl,pins = <
				MX6SX_PAD_SD4_CLK__USDHC4_CLK		0x10059
				MX6SX_PAD_SD4_CMD__USDHC4_CMD		0x17059
				MX6SX_PAD_SD4_DATA0__USDHC4_DATA0	0x17059
				MX6SX_PAD_SD4_DATA1__USDHC4_DATA1	0x17059
				MX6SX_PAD_SD4_DATA2__USDHC4_DATA2	0x17059
				MX6SX_PAD_SD4_DATA3__USDHC4_DATA3	0x17059
				MX6SX_PAD_SD4_DATA4__USDHC4_DATA4	0x17059
				MX6SX_PAD_SD4_DATA5__USDHC4_DATA5	0x17059
				MX6SX_PAD_SD4_DATA6__USDHC4_DATA6	0x17059
				MX6SX_PAD_SD4_DATA7__USDHC4_DATA7	0x17059
				MX6SX_PAD_SD4_RESET_B__USDHC4_RESET_B	0x17068
			>;
		};
		pinctrl_uart1: uart1grp {
			fsl,pins = <
				MX6SX_PAD_ENET2_CRS__UART1_TX		0x1b0b1
				MX6SX_PAD_ENET2_COL__UART1_RX		0x1b0b1
				MX6SX_PAD_ENET2_TX_CLK__UART1_CTS_B	0x1b0b1
				MX6SX_PAD_ENET2_RX_CLK__UART1_RTS_B	0x1b0b1
			>;
		};
	};
};