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I don't think we do anything crazy here on the HW level, so I would say anything based on RK3399 and RK3588(S) which advertises an USB OTG port should be able to work. For RK3588(S) maybe check if it's on USB-C, as I am not entirely sure whether we (upstream kernel) support FUSB302 (used in the reference design from Rockchip I believe, so most manufacturers do use them to limit risks) USB-C connector for OTG just yet (about to though if I remember correctly). Maybe have a look on the side of RK356x (RK3566/RK3568) as well, I've seen a few with ROCKUSB enabled in U-Boot, which means OTG (at least in peripheral mode) is supported in U-Boot. For reference, this is the test I run: """ #!/bin/sh # Change UDC environment variable according to USB controller connected to USB OTG port set -eu UDC=${UDC:-"fc000000.usb"} cleanup_usb_otg() { echo "" > "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/UDC" rm "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/configs/conf.1/acm.1" rmdir "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/configs/conf.1/strings/0x409/" rmdir "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/configs/conf.1/" rmdir "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/functions/acm.1/" rmdir "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/strings/0x409/" rmdir "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/" } run_cmd() { set -x "$@" set +x } test_serial() { TX=$1 RX=$2 RXPROOF=$(mktemp) ORIG=$(mktemp) (cat "$RX" > "$RXPROOF")& PID=$! printf "test123test123test\n" > "$ORIG" # NOTE: \r instead of \n # The message is sent only if \r or \n is passed, however the receiving # end adds an additional newline. Therefore, to check data integrity the # last character is different in the reference file and the message # being sent. printf "test123test123test\r" > "$TX" # Give some time for the message to make it to the other side of the # communication before killing the process. sleep 1 kill $PID wait $PID || true diff "$ORIG" "$RXPROOF" rm -rf "$ORIG" "$RXPROOF" } CONFIGFS_HOME=$(findmnt --noheadings --types configfs -o target) if [ -z "$CONFIGFS_HOME" ]; then CONFIGFS_HOME=$(mktemp --directory) run_cmd mount none -t configfs "$CONFIGFS_HOME" fi if [ -e "$CONFIGFS_HOME/usb_gadget/q7-usb-p2" ]; then set +e run_cmd cleanup_usb_otg set -e fi run_cmd mkdir "$CONFIGFS_HOME/usb_gadget/q7-usb-p2" run_cmd echo 0xabcd > "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/idVendor" run_cmd echo 0xef01 > "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/idProduct" run_cmd mkdir "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/strings/0x409" run_cmd echo SN1234567890 > "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/strings/0x409/serialnumber" run_cmd echo Theobroma > "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/strings/0x409/manufacturer" run_cmd echo Tiger-Haikou > "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/strings/0x409/product" run_cmd mkdir "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/configs/conf.1/" run_cmd mkdir "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/configs/conf.1/strings/0x409" run_cmd echo "USB ACM test" > "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/configs/conf.1/strings/0x409/configuration" run_cmd mkdir "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/functions/acm.1" run_cmd ln -s "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/functions/acm.1" "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/configs/conf.1" run_cmd echo "$UDC" > "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/UDC" # Give some time for the ACM device to be probed by the kernel sleep 2 ACM="/dev/ttyACM0" GS="/dev/ttyGS$(cat "$CONFIGFS_HOME/usb_gadget/q7-usb-p2/functions/acm.1/port_num")" run_cmd test_serial "$ACM" "$GS" run_cmd test_serial "$GS" "$ACM" echo "All good!" """ Once run, connect a USB stick to the port, it should be detected. Cheers, Quentin