DESK-MX9-L/Peripherals/SD
< DESK-MX9-L
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Contents
Peripheral SD[edit | edit source]
Device tree configuration[edit | edit source]
N.B. The USDHC interface is re-configured on carrier device tree because of the Card Detect pin (which is related to the real board hardware implementation).
AURA SOM[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the ORCA SOM:
From imx93-aura-cb2001.dts:
...
&usdhc2 {
status = "okay";
};
...
From imx93-aura.dtsi:
...
&usdhc2 {
pinctrl-names = "default", "state_100mhz", "state_200mhz";
pinctrl-0 = <&pinctrl_usdhc2>, <&pinctrl_usdhc2_gpio>;
pinctrl-1 = <&pinctrl_usdhc2>, <&pinctrl_usdhc2_gpio>;
pinctrl-2 = <&pinctrl_usdhc2>, <&pinctrl_usdhc2_gpio>;
cd-gpios = <&gpio3 00 GPIO_ACTIVE_LOW>;
bus-width = <4>;
no-sdio;
no-mmc;
disable-wp;
no-1-8-v;
status = "disabled";
};
...
&iomuxc {
...
pinctrl_usdhc2_gpio: usdhc2gpiogrp {
fsl,pins = <
MX93_PAD_SD2_CD_B__GPIO3_IO00 0x31e
>;
};
pinctrl_usdhc2: usdhc2grp {
fsl,pins = <
MX93_PAD_SD2_CLK__USDHC2_CLK 0x17fe
MX93_PAD_SD2_CMD__USDHC2_CMD 0x13fe
MX93_PAD_SD2_DATA0__USDHC2_DATA0 0x13fe
MX93_PAD_SD2_DATA1__USDHC2_DATA1 0x13fe
MX93_PAD_SD2_DATA2__USDHC2_DATA2 0x13fe
MX93_PAD_SD2_DATA3__USDHC2_DATA3 0x13fe
MX93_PAD_SD2_VSELECT__USDHC2_VSELECT 0x51e
>;
};
...
};
Accessing the peripheral in AURA SOM[edit | edit source]
Once initialized, the SD device is mapped to the standard /dev/mmcblk1pX block device, depending on how many partition are created on the SD card.
Linux messages at boot time[edit | edit source]
If the microSd card is inserted at boot time, the kernel - once the USDHC interface has been initialized - prints the device information and the partition detected like p1, p2, etc.:
... ... [ 1.347520] sdhci: Secure Digital Host Controller Interface driver [ 1.353715] sdhci: Copyright(c) Pierre Ossman [ 1.365042] sdhci-pltfm: SDHCI platform and OF driver helper ... [ 1.402850] mmc0: SDHCI controller on 42850000.mmc [42850000.mmc] using ADMA [ 1.525510] mmc0: new DDR MMC card at address 0001 [ 1.532646] mmcblk0: mmc0:0001 DG4008 7.28 GiB [ 1.543004] mmcblk0: p1 p2 [ 1.549076] mmcblk0boot0: mmc0:0001 DG4008 4.00 MiB [ 1.557364] mmcblk0boot1: mmc0:0001 DG4008 4.00 MiB [ 1.566409] mmcblk0rpmb: mmc0:0001 DG4008 4.00 MiB, chardev (234:0) [ 1.814684] sdhci-esdhc-imx 42860000.mmc: Got CD GPIO [ 1.851039] mmc1: SDHCI controller on 42860000.mmc [42860000.mmc] using ADMA [ 1.889752] mmc1: new high speed SDHC card at address 5048 [ 1.900514] mmcblk1: mmc1:5048 SD32G 28.9 GiB [ 1.906361] mmcblk1: p1 p2 [ 2.358195] EXT4-fs (mmcblk1p2): mounted filesystem with ordered data mode. Quota mode: none. [ 4.890543] EXT4-fs (mmcblk1p2): re-mounted. Quota mode: none. ...
Additional information[edit | edit source]
If are executed the boot with NFS the file system configuration does automatically mount the uSD partitions.
root@desk-mx93:~# lsblk /dev/mmcblk1 NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS mmcblk1 179:96 0 28.9G 0 disk |-mmcblk1p1 179:97 0 83.2M 0 part /run/media/boot-mmcblk1p1 `-mmcblk1p2 179:98 0 6.5G 0 part /run/media/root-mmcblk1p2 root@desk-mx93:~#
