DESK-MX9-L/Peripherals/USB1 OTG
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Contents
Peripheral USB1 OTG[edit | edit source]
AURA SOM supports OTG/Host/Peripheral modes: on AURA Evaluation Kit the USB1 OTG port is configured as peripheral.
Device tree configuration[edit | edit source]
Here below is an example of device tree configuration used on standard DAVE's kit for the AURA SOM:
From kernel device tree imx93-aura.dtsi:
...
&usbotg1 {
dr_mode = "peripheral";
hnp-disable;
srp-disable;
adp-disable;
disable-over-current;
samsung,picophy-pre-emp-curr-control = <3>;
samsung,picophy-dc-vol-level-adjust = <7>;
status = "disabled";
};
...
From kernel device tree imx93-aura-sbcx.dtsi:
/ {
...
&usbotg1 {
dr_mode = "peripheral";
status = "okay";
};
...
Accessing the peripheral[edit | edit source]
Usage with mass-storage[edit | edit source]
root@desk-mx93-rev1:~# dd if=/dev/zero of=mass_storage count=256 bs=1M 256+0 records in 256+0 records out 268435456 bytes (268 MB, 256 MiB) copied, 0.583141 s, 460 MB/s root@desk-mx93-rev1:~# mkfs.msdos mass_storage mkfs.fat 4.2 (2021-01-31) root@desk-mx93-rev1:~# root@desk-mx93-rev1:~# mkdir loop root@desk-mx93-rev1:~# mount -o loop mass_storage loop root@desk-mx93-rev1:~# echo "Test USB OTG with mass storage device" > loop/usb.txt root@desk-mx93-rev1:~# umount loop root@desk-mx93-rev1:~#
then insert the g_mass_storage kernel module driver enabling an Windows PC to see it as a removable device
root@desk-mx93-rev1:~# modprobe g_mass_storage removable=y file=mass_storage [ 956.067086] Mass Storage Function, version: 2009/09/11 [ 956.072249] LUN: removable file: (no medium) [ 956.077037] LUN: removable file: /root/mass_storage [ 956.082066] Number of LUNs=1 [ 956.085113] g_mass_storage gadget.0: Mass Storage Gadget, version: 2009/09/11 [ 956.092277] g_mass_storage gadget.0: userspace failed to provide iSerialNumber [ 956.099516] g_mass_storage gadget.0: g_mass_storage ready
Once the USB cable is connected to the PC, the kernel prints the following messages:
[10029.505852] usb 1-1.1: USB disconnect, device number 6 [10031.752740] usb 1-1.1: new high-speed USB device number 7 using xhci_hcd [10031.842231] usb 1-1.1: New USB device found, idVendor=0525, idProduct=a4a5, bcdDevice= 6.06 [10031.842259] usb 1-1.1: New USB device strings: Mfr=3, Product=4, SerialNumber=0 [10031.842274] usb 1-1.1: Product: Mass Storage Gadget [10031.842287] usb 1-1.1: Manufacturer: Linux 6.6.52-desk-mx9-l-6.0.0-lts-next-lts-next-gf90bc32626fe with 4c100000.usb [10031.844420] usb-storage 1-1.1:1.0: USB Mass Storage device detected [10031.845248] usb-storage 1-1.1:1.0: Quirks match for vid 0525 pid a4a5: 10000 [10031.845454] scsi host0: usb-storage 1-1.1:1.0 [10032.865376] scsi 0:0:0:0: Direct-Access Linux File-Stor Gadget 0606 PQ: 0 ANSI: 2 [10032.867719] sd 0:0:0:0: Power-on or device reset occurred [10032.871739] sd 0:0:0:0: [sda] 524288 512-byte logical blocks: (268 MB/256 MiB) [10032.910957] sd 0:0:0:0: Attached scsi generic sg0 type 0 [10032.977486] sd 0:0:0:0: [sda] Write Protect is off [10032.977517] sd 0:0:0:0: [sda] Mode Sense: 0f 00 00 00 [10033.085505] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [10033.333543] sda: [10033.333718] sd 0:0:0:0: [sda] Attached SCSI removable disk
