How to use g_mass_storage module

[hyphop]

@majedalanni

New here and I would like to use my VIM2 as USB flash disk for my Tesla,
current EMMC image is ubuntu server with kernel 4.9.29

I have built a kernel with USB gadget mass storage and was able to load using modprobe g_mass_storage file=/usb.bin stall=0 ro=1 remoable=y but nothing showed in my windows laptop.

1. make proper kernel and modules config with USB_GADGET support, rebuild kernel and install
2. change dtb/dts for change usb mode from HOST to DEVICE

NOTE: vendor kernel 4.9.29 dts

&dwc2_a {
	status = "okay";
	/** 0: normal, 1: otg+dwc3 host only, 2: otg+dwc3 device only*/
	controller-type = <3>;
};

NOTE: mainline kernel 5.4.xxx need some patches u can get workable kernel and dts with USB_GADGET there GitHub - hyphop/khadas-linux-kernel: linux kernel for khadas vim boards

NOTE: dont forget change kbi portmode from PCIE to USB !!!