GPIO

https://blog.csdn.net/xnwyd/article/details/9042159

https://www.emcraft.com/som/vf6/controlling-gpio-from-linux

Now run the following shell commands to turn the LED on and off at a 1Hz frequency:
while echo hey; do echo 1 > gpio36/value; sleep 1; echo 0 > gpio36/value; sleep 1; done

LTE_LEDon	MX6_PAD_GPIO_1__GPIO_1_1	md 20E0210
LED1	MX6_PAD_DISP0_DAT0__GPIO4_IO21	md 20E00B0
LED2	MX6_PAD_GPIO_2__GPIO1_IO02	md 20E0224
LED3	MX6_PAD_GPIO_4__GPIO1_IO04	md 20E022C
LED4	MX6_PAD_GPIO_5__GPIO1_IO05	md 20E0230
LED5	MX6_PAD_EIM_D29__GPIO3_IO29	md 20E0178
LED6	MX6_PAD_EIM_D16__GPIO3_IO16	md 20E0144

全亮: mw 20A8000 200000 mw 209C000 36 mw 20A4000 20010000 全熄: mw 20A8000 00 mw 209C000 00 mw 20A4000 00

Ethtool

+-------+   +-------+   +-------+       +-------+    +-------+   +-------+
|       |   |       |   |       |       |       |    |       |   |       |
|Host   |<-- br="" nbsp="">|Ctrl   |   | FIFOs |   |  MAC  |  MII  |  PHY  |    |Xformer|   | RJ-45 |
|uC     +-->|       +-->|       +------>|       +--->|       +-->|       |
|       |   |       |   |       |       |       |    |       |   |       |
+-------+   +-------+   +-------+       +-------+    +-------+   +-------+
https://serverfault.com/questions/566229/ethtool-says-that-eth0-uses-mii-but-twisted-pair-is-used

GATT

http://dev.ti.com/tirex/content/simplelink_cc2640r2_sdk_1_40_00_45/docs/blestack/ble_user_guide/html/ble-stack-3.x/gatt.html

uboot

http://www.cnblogs.com/aaronLinux/p/5744960.html

I2C Address

http://simplemachines.it/doc/IC12_97_I2C_ALLOCATION.pdf

System.map 案例

http://blog.csdn.net/tommy_wxie/article/details/8039695

AT Command

https://kunyichen.wordpress.com/2005/09/09/%E5%BB%BA%E7%AB%8B-tcpip-over-gprsegprs-%E7%9A%84%E6%96%B9%E6%B3%95-part-i/

必須由系統服務業者(Operator)提供一個 APN(Access Point Node or Access Point Name)
在台灣的系統業者 APN 設定如下

• 台灣大哥大(TCC)：internet
• 中華電信(CHT)：emome
• 和信電訊(KGT)：wap
• 遠傳(FET)：fetnet01
• 泛亞電信：hank
• 東信：gprs2, username:gprs password:gprs

其餘各家業者 User name與Password則皆為空白

當設定完成 APN 後，倘若系統業者有提供 WAP 且 STK(Sim card Tool kits)內有開啟WAP&GPRS 業務功能，這時可以試著透過使用WAP來連接上網

當由另一設備想要透過一個 GPRS Modem 撥接上網，則需透過 AT Commad來控制 GPRS Modem

• 設定PDP內容
AT+CGDCONT=1,"IP","ARN for Operator", "", 0,0

• 用ATD*99# 撥上 GPRS 網路,(*99# or *99***N#，N為順位一般直接設定為1，即*99***1# 根據不同廠牌的行動電話有所不同)，採用MTK Solution 的行動電話為*99#, Nokia 為*99***N#)
• 使用PPP(Point to Point Protocol)與業者的PPP Server 連線，進行TCP/IP over GPRS的實際動作。事實上是採用TCP/IP over PPP來達成目的。

[Dialer Defaults]
Modem = /dev/ttyUSB3
Baud = 230400
Username = 'username'
Password = 'password'
Phone = *99#
[Dialer PIN]
Init1 = AT+CPIN?
[Dialer CHT]
APN = emome
Init2 = ATZ
Init3 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init4 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init5 = AT+CGDCONT=1,"ip","internet"
Stupid Mode = 1
Modem Type = Analog Modem
ISDN = 0
Auto Reconnect = on
Dial Command = ATDT