EC20 R2.0移植海思平台

1、内核添加VID和PID

   在内核中\drivers\usb\serial\option.c，static const struct usb_device_id option_ids后面加入EC20/EC25的硬件ID

  //define Quectel VID and PID(注意EC20 R2.0 VID和EC25一样)

/* These Quectel products use Qualcomm's vendor ID */
#define QUECTEL_PRODUCT_UC20			0x9003
#define QUECTEL_PRODUCT_UC15			0x9090
#define QUECTEL_PRODUCT_EC20			0x9215
#define QUECTEL_VENDOR_ID				0x2c7c
/* These Quectel products use Quectel's vendor ID */
#define QUECTEL_PRODUCT_EC21			0x0121
#define QUECTEL_PRODUCT_EC25			0x0125

       在usb_device_id option_ids中添加如下

    /* Quectel products using Qualcomm vendor ID */
	{ USB_DEVICE(QUALCOMM_VENDOR_ID, QUECTEL_PRODUCT_UC15)},
	{ USB_DEVICE(QUALCOMM_VENDOR_ID, QUECTEL_PRODUCT_UC20),
	  .driver_info = (kernel_ulong_t)&net_intf4_blacklist },
	/*EC20 add by admin*/
	{ USB_DEVICE(QUALCOMM_VENDOR_ID, QUECTEL_PRODUCT_EC20) },
	/* Quectel products using Quectel vendor ID */
	{ USB_DEVICE(QUECTEL_VENDOR_ID, QUECTEL_PRODUCT_EC21),
	  .driver_info = (kernel_ulong_t)&net_intf4_blacklist },
	{ USB_DEVICE(QUECTEL_VENDOR_ID, QUECTEL_PRODUCT_EC25),
	  .driver_info = (kernel_ulong_t)&net_intf4_blacklist },

2、内核menuconfig

确保内核已经开启USB网卡和USB串口驱动的支持
CONFIG_USB_SERIAL=y
CONFIG_USB_SERIAL_WWAN=y
CONFIG_USB_SERIAL_OPTION=y
CONFIG_USBNET=y 

3、编译内核，烧录

/opt/bin # ls -l /dev/ttyUSB*
crw-------    1 root     root      188,   3 Jan  1 08:02 /dev/ttyUSB0
crw-------    1 root     root      188,   1 Jan  1 08:00 /dev/ttyUSB1
crw-------    1 root     root      188,   2 Jan  1 08:02 /dev/ttyUSB2
crw-------    1 root     root      188,   0 Jan  1 08:00 /dev/ttyUSB3

测试AT指令

/opt/bin # cat /dev/ttyUSB2 & echo -e "AT+GMR\r\n" >/dev/ttyUSB2
AT+GMR

EC20CEFDR02A12M4G

OK

4、编译pppd源码

    拷贝chat和pppd到/usr/sbin/，在/etc/ppp/中配置相关拨号脚本

5、拨号上网