1、查看Linux内核版本

uname -r

2、根据内核版本在Github上下载Linux内核源码（最好再Github上确定一下有没有这个分支）

git clone --depth=1 https://github.com/raspberrypi/linux --branch rpi-5.15.y

3、下载依赖库

$ sudo apt update

$ sudo apt install raspberrypi-kernel-headers

$ sudo apt install bc libncurses5-dev bison flex libssl-dev make libc6-dev

4、配置

cd linux/drivers/usb/serial/

（1）修改第1个文件（从#if 1 到 #endif）

sudo nano drivers/usb/serial/option.c

static const struct usb_device_id option_ids[] = {
#if 1 //Added by Quectel
{ USB_DEVICE_AND_INTERFACE_INFO(0x2c7c, 0x0900, 0xff, 0x00, 0x00) },
#endif

static struct usb_serial_driver option_1port_device = {
......

#ifdef CONFIG_PM
.suspend = usb_wwan_suspend,
.resume = usb_wwan_resume,
#if 1 //Added by Quectel
.reset_resume = usb_wwan_resume,
#endif
#endif
};

（2）修改第2个文件（从#if 1 到 #endif）

sudo nano drivers/usb/serial/usb_wwan.c

static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
 int dir, void *ctx, char *buf, int len,void (*callback) (struct urb *))
{
	......
	
	usb_fill_bulk_urb(urb, serial->dev,usb_sndbulkpipe(serial->dev, endpoint) | dir,buf, len, callback, ctx);
	#if 1 //Added by Quectel for zero packet
	if (dir == USB_DIR_OUT)
	{
		struct usb_device_descriptor *desc = &serial->dev->descriptor;
		if (desc->idVendor == cpu_to_le16(0x2C7C))
		{
			urb->transfer_flags |= URB_ZERO_PACKET;
		}
	}
	#endif
	return urb;
}

5、编译

KERNEL=kernel8  

sudo make bcm2711_defconfig

sudo make -j4 modules 

sudo make modules_install