When using an external sd card, the /dev/mmcblk number changes every time you boot

[yhlee1]

Hello

Xavier nx is using it after changing the dtb so that it can recognize the external sd card.

The /dev/mmcblk number changes every time I boot.
can i fix this?

If possible, what should be modified?
dmesg.txt (67.1 KB)
journalctl.txt (199.1 KB)

tegra194-p3668-all-p3509-0000.dtb (316.5 KB)

Thank you.

[WayneWWW]

Why did you enable all 3 sdhci controllers here? That is why your sdmmc3 device does not mount in fix path.

[ 6.545050] mmc0: SDHCI controller on 3460000.sdhci [3460000.sdhci] using ADMA 64-bit
[ 6.545346] mmc2: SDHCI controller on 3440000.sdhci [3440000.sdhci] using ADMA 64-bit
[ 6.553770] mmc1: SDHCI controller on 3400000.sdhci [3400000.sdhci] using ADMA 64-bit

It is a “either-or” choice for every NX module to use 3460000 or 340000. As sdcard module would use one while emmc module would use another…

External sdcard is always on 3440000.

[yhlee1]

Hello,

Because I’m using @3460000 in emmc
Can I disable sdhci@3400000 like below?

before

	sdhci_emmc: sdhci@3460000 {
		uhs-mask = <0x0>;
		nvidia,enable-hwcq;
		status = "okay";
	};

	sdhci_sd: sdhci@3400000 {
		mmc-ocr-mask = <0x0>;
		cd-inverted;
		cd-gpios = <&tegra_main_gpio TEGRA194_MAIN_GPIO(G, 7) 0>;
		nvidia,cd-wakeup-capable;
		mmc-ocr-mask = <0>;
		cd-inverted;
		vmmc-supply = <&p3668_vdd_sdmmc1_sw>;
		status = "okay";
	};

	sdhci_sd1: sdhci@3440000 { //added this node
			mmc-ocr-mask = <0x0>;
			cd-inverted;
			cd-gpios = <&tegra_main_gpio TEGRA194_MAIN_GPIO(Q, 2) 0>;
			nvidia,cd-wakeup-capable;
			mmc-ocr-mask = <0>;
			cd-inverted;
			vmmc-supply = <&p3668_vdd_sdmmc1_sw>;
			status = "okay";
	};

after

	sdhci_emmc: sdhci@3460000 {
		uhs-mask = <0x0>;
		nvidia,enable-hwcq;
		status = "okay";
	};

	sdhci_sd: sdhci@3400000 {
		mmc-ocr-mask = <0x0>;
		cd-inverted;
		cd-gpios = <&tegra_main_gpio TEGRA194_MAIN_GPIO(G, 7) 0>;
		nvidia,cd-wakeup-capable;
		mmc-ocr-mask = <0>;
		cd-inverted;
		vmmc-supply = <&p3668_vdd_sdmmc1_sw>;
		status = "disabled";
	};

	sdhci_sd1: sdhci@3440000 { //added this node
			mmc-ocr-mask = <0x0>;
			cd-inverted;
			cd-gpios = <&tegra_main_gpio TEGRA194_MAIN_GPIO(Q, 2) 0>;
			nvidia,cd-wakeup-capable;
			mmc-ocr-mask = <0>;
			cd-inverted;
			vmmc-supply = <&p3668_vdd_sdmmc1_sw>;
			status = "okay";
	};

Thank you.

[WayneWWW]

Hi,

I am more curious about your comment here.

It should not be “you” that made this decision. The device shall handle this well during boot stage.

Did you enable sdhci@3400000 by yourself or it just boots like that?

[yhlee1]

Hello,

Did you enable sdhci@3400000 by yourself or it just boots like that?
=> No.

To use the external sd card, I just added the node n ocha@3440000 near line 277 of the dtsi file below.

tegra194-p3668-common.dtsi (13.4 KB)

sdhci_sd1: sdhci@3440000 { //added this node
 mmc-ocr-mask = <0x0>;
 cd-inverted;
 cd-gpios = <&tegra_main_gpio TEGRA194_MAIN_GPIO(Q, 2) 0>;
 nvidia,cd-wakeup-capable;
 mmc-ocr-mask = <0>;
 cd-inverted;
 vmmc-supply = <&p3668_vdd_sdmmc1_sw>;
 status = "okay";
};

If you reboot after this, sometimes the micro sd card becomes /dev/mmcblk1 and sometimes /dev/mmcblk2.

How do I modify dtsi to fix this invariably?

Thank you.

[yhlee1]

Hello @WayneWWW

I’m not trying to boot from an external sd card, I’m just trying to use it by recognizing it as storage.

Thank you.

[WayneWWW]

Hi,

Forget about your external sdcard. It is not the main issue right now.

If you just flash default jetpack from sdkmanager, will you see both sdhci@3400000 and sdhci@3460000 enabled at same time?

Also, do you have other NX modules that can do the same test too?

[WayneWWW]

Sorry. A typo.

I am asking sdhci@3400000 and sdhci@3460000

[yhlee1]

Hello,

Jetpack has been returned to the initial installation state.
On dmesg, only one sdhci controller on 3460000.sdhci is visible.

Is there a command to check if sdhci@3400000 and sdhci@3460000 are active at the same time?

Thank you.

[WayneWWW]

What was your method to update a device tree after you enable sdmmc3?

[yhlee1]

Hello, @WayneWWW

convert xxx.dtb to xxx.dts using dtc.

Thank you.

[WayneWWW]

then…?

[yhlee1]

Hello,

insert FDT /boot/xxx.dtb to /boot/extlinux/extlinux.conf

Thank you.

[WayneWWW]

Ok, I guess issue would be resolved if you do full flash instead.

If it cannot resolve, then just disable that sdhci@3400000 in your dtb.