5G：RM500U-CN 5G模组调试

一、内核配置与修改

• 打开内核以下配置

CONFIG_USB_SERIAL=y 
CONFIG_USB_SERIAL_WWAN=y 
CONFIG_USB_SERIAL_OPTION=y
CONFIG_USBNET=y 

• 将以下补丁打入内核

diff --git a/kernel/drivers/usb/serial/option.c b/kernel/drivers/usb/serial/option.c
old mode 100644
new mode 100755
index a47eac02f..d3849f84b
--- a/kernel/drivers/usb/serial/option.c
+++ b/kernel/drivers/usb/serial/option.c
@@ -1983,6 +1983,7 @@ static const struct usb_device_id option_ids[] = {.driver_info = RSVD(4) | RSVD(5) },{ USB_DEVICE_INTERFACE_CLASS(0x2cb7, 0x0105, 0xff),                     /* Fibocom NL678 series */.driver_info = RSVD(6) },
+       { USB_DEVICE_AND_INTERFACE_INFO(0x2c7c, 0x0900, 0xff, 0x00, 0x00) },{ } /* Terminating entry */};MODULE_DEVICE_TABLE(usb, option_ids);
@@ -2017,6 +2018,7 @@ static struct usb_serial_driver option_1port_device = {#ifdef CONFIG_PM.suspend           = usb_wwan_suspend,.resume            = usb_wwan_resume,
+       .reset_resume      = usb_wwan_resume,#endif};diff --git a/kernel/drivers/usb/serial/usb_wwan.c b/kernel/drivers/usb/serial/usb_wwan.c
old mode 100644
new mode 100755
index 802249072..b4ef55799
--- a/kernel/drivers/usb/serial/usb_wwan.c
+++ b/kernel/drivers/usb/serial/usb_wwan.c
@@ -508,7 +508,8 @@ static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,if (dir == USB_DIR_OUT) {if ((desc-

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