SMART Embedded Computing COMX-P2020 BSP User Manual page 50

U-boot Deployment
Table 5-2
Name
GPIO 10
GPIO 11
GPIO 12
GPIO 13
GPIO 14
GPIO 15
 Show GPIO Direction:
The command: "gpio showdirection" can be used to show the setting of all GPIO's
direction. For example:
=> gpio showdirection
GPIO0 = Input(00)
GPIO1 = Input(00)
GPIO2 = Input(00)
GPIO3 = Input(00)
GPIO4 = Output(10)
GPIO5 = Output(10)
GPIO6 = Output(10)
GPIO7 = Output(10)
GPIO8 = Input(00)
GPIO9 = Input(00)
GPIO10 = Output(10)
GPIO11 = Input(00)
GPIO12 = Output(10)
GPIO13 = Input(00)
50
GPIO Description (continued)
Intput/ Output
Output
Input
Output
Input
Output
Input
Reset Value Description
It can be used to clear WDT timer.
0 If the pin is set to 1, the WDT timer will be
cleared.
Connect to COM-E Carry board
If this pin is set to 1, and s3[14] is set to
OFF, then Serdes#2 is switch to COMe
PCI #2;
If this pin is set to 0, or s3[14] is set to
1 ON, then Serdes#2 is switch to
GEPHY2.
For Blackadder-P2020, GPIO[12] must
be set to 1 and s3[14] must be set to
OFF.
Connect to COM-E Carry board.
Connect to COM-E Carry board
Connect to COM-E Carry board
COMX-P2020 BSP User Guide (6806800L84C)
U-boot Deployment