DESK-MP1-L/Peripherals/micro SD
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| 2023/08/02 | DESK-MP1-L-1.0.0 release | ||
Contents
Peripheral SD[edit | edit source]
Device tree configuration[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the ETRA SOM:
From kernel device tree stm32mp157a-dcsb5000dd1r.dts:
&pinctrl {
...
...
sdmmc1_pins_mx: sdmmc1_mx-0 {
u-boot,dm-pre-reloc;
pins1 {
u-boot,dm-pre-reloc;
pinmux = <STM32_PINMUX('C', 8, AF12)>, /* SDMMC1_D0 */
<STM32_PINMUX('C', 9, AF12)>, /* SDMMC1_D1 */
<STM32_PINMUX('C', 11, AF12)>, /* SDMMC1_D3 */
<STM32_PINMUX('D', 2, AF12)>, /* SDMMC1_CMD */
<STM32_PINMUX('E', 6, AF8)>; /* SDMMC1_D2 */
bias-disable;
drive-push-pull;
slew-rate = <1>;
};
pins2 {
u-boot,dm-pre-reloc;
pinmux = <STM32_PINMUX('C', 12, AF12)>; /* SDMMC1_CK */
bias-disable;
drive-push-pull;
slew-rate = <3>;
};
};
sdmmc1_opendrain_pins_mx: sdmmc1_opendrain_mx-0 {
u-boot,dm-pre-reloc;
pins1 {
u-boot,dm-pre-reloc;
pinmux = <STM32_PINMUX('C', 8, AF12)>, /* SDMMC1_D0 */
<STM32_PINMUX('C', 9, AF12)>, /* SDMMC1_D1 */
<STM32_PINMUX('C', 11, AF12)>, /* SDMMC1_D3 */
<STM32_PINMUX('E', 6, AF8)>; /* SDMMC1_D2 */
bias-disable;
drive-push-pull;
slew-rate = <1>;
};
pins2 {
u-boot,dm-pre-reloc;
pinmux = <STM32_PINMUX('C', 12, AF12)>; /* SDMMC1_CK */
bias-disable;
drive-push-pull;
slew-rate = <3>;
};
pins3 {
u-boot,dm-pre-reloc;
pinmux = <STM32_PINMUX('D', 2, AF12)>; /* SDMMC1_CMD */
bias-disable;
drive-open-drain;
slew-rate = <1>;
};
};
sdmmc1_sleep_pins_mx: sdmmc1_sleep_mx-0 {
pins {
pinmux = <STM32_PINMUX('C', 8, ANALOG)>, /* SDMMC1_D0 */
<STM32_PINMUX('C', 9, ANALOG)>, /* SDMMC1_D1 */
<STM32_PINMUX('C', 11, ANALOG)>, /* SDMMC1_D3 */
<STM32_PINMUX('C', 12, ANALOG)>, /* SDMMC1_CK */
<STM32_PINMUX('D', 2, ANALOG)>, /* SDMMC1_CMD */
<STM32_PINMUX('E', 6, ANALOG)>; /* SDMMC1_D2 */
};
};
...
...
};
...
...
&sdmmc1{
pinctrl-names = "default", "opendrain", "sleep";
pinctrl-0 = <&sdmmc1_pins_mx>;
pinctrl-1 = <&sdmmc1_opendrain_pins_mx>;
pinctrl-2 = <&sdmmc1_sleep_pins_mx>;
status = "okay";
/* USER CODE BEGIN sdmmc1 */
cd-gpios = <&gpioe 9 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
disable-wp;
st,neg-edge;
bus-width = <4>;
vmmc-supply = <&v3v3>;
/* USER CODE END sdmmc1 */
};
...
...
Accessing the peripheral[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.:
root@desk-mp1:~# dmesg | grep mmc [ 0.000000] Kernel command line: root=/dev/mmcblk1p10 rootwait rw console=ttySTM0,115200 [ 2.216453] mmci-pl18x 48004000.mmc: mmc0: PL180 manf 53 rev2 at 0x48004000 irq 38,0 (pio) [ 2.417608] mmci-pl18x 58005000.mmc: Got CD GPIO [ 2.422190] mmci-pl18x 58005000.mmc: mmc1: PL180 manf 53 rev2 at 0x58005000 irq 42,0 (pio) [ 2.447764] mmc0: queuing unknown CIS tuple 0x01 [d9 01 ff] (3 bytes) [ 2.459096] mmci-pl18x 58007000.mmc: mmc2: PL180 manf 53 rev2 at 0x58007000 irq 43,0 (pio) [ 2.467440] mmc0: queuing unknown CIS tuple 0x1a [01 01 00 02 07] (5 bytes) [ 2.476177] mmc0: queuing unknown CIS tuple 0x1b [c1 41 30 30 ff ff 32 00] (8 bytes) [ 2.484060] mmc0: queuing unknown CIS tuple 0x14 [] (0 bytes) [ 2.495219] mmc0: new high speed SDIO card at address 0001 [ 2.502454] mmc1: new high speed SDHC card at address 59b4 [ 2.509422] mmcblk1: mmc1:59b4 USDU1 14.9 GiB [ 2.532495] mmcblk1: p1 p2 p3 p4 p5 p6 p7 p8 p9 p10 p11 [ 2.598234] mmc2: new DDR MMC card at address 0001 [ 2.603366] mmcblk2: mmc2:0001 W62704 3.53 GiB [ 2.612505] mmcblk2boot0: mmc2:0001 W62704 2.00 MiB [ 2.619409] mmcblk2boot1: mmc2:0001 W62704 2.00 MiB [ 2.625675] mmcblk2rpmb: mmc2:0001 W62704 512 KiB, chardev (240:0) [ 3.320665] EXT4-fs (mmcblk1p10): recovery complete [ 3.328018] EXT4-fs (mmcblk1p10): mounted filesystem with ordered data mode. Opts: (null). Quota mode: disabled. [ 8.586451] EXT4-fs (mmcblk1p10): re-mounted. Opts: (null). Quota mode: disabled. [ 8.819545] EXT4-fs (mmcblk1p8): recovery complete [ 8.822966] EXT4-fs (mmcblk1p8): mounted filesystem with ordered data mode. Opts: (null). Quota mode: disabled. [ 9.403677] EXT4-fs (mmcblk1p9): recovery complete [ 9.411111] EXT4-fs (mmcblk1p9): mounted filesystem with ordered data mode. Opts: (null). Quota mode: disabled. [ 9.745622] EXT4-fs (mmcblk1p11): recovery complete [ 9.749683] EXT4-fs (mmcblk1p11): mounted filesystem with ordered data mode. Opts: (null). Quota mode: disabled.
Additional information[edit | edit source]
If the root file system configuration does not automatically mount the partition, it is possible to mount the device using the following command:
root@desk-mp1:~# mkdir -p /mnt/boot root@desk-mp1:~# mkdir -p /mnt/rfs root@desk-mp1:~# mount /dev/mmcblk1p1 /mnt/boot/ root@desk-mp1:~# mount /dev/mmcblk1p2 /mnt/rfs/ root@desk-mp1:~# ls /mnt/boot/ boot.scr lost+found stm32mp157a-dcsb5000dd1r.dtb uImage root@desk-mp1:~# ls /mnt/rfs/ bin boot dev etc home lib lost+found media mnt proc run sbin srv sys tmp usr var vendor root@desk-mp1:~#
and then the mounted partition are available on the /mnt/boot and /mnt/rfs root file system directories.
