Artesyn COMX-P2020 BSP User Guide (July 2014) - Manual (Page 49)

U-boot Deployment
COMX-P2020 BSP User Guide (6806800L84B) 49
5.4.2 GPIO
There are a total of 16 GPIO used at COMX-P2020.
Table 5-2 GPIO Description
Name Intput/ Output Reset Value Description
GPIO 0 Input Connected to the COM-E Carrier Board
GPIO 1 Input Connected to the COM-E Carrier Board
GPIO 2 Input Connected to the COM-E Carrier Board
GPIO 3 Input Connected to the COM-E Carrier Board
GPIO 4 Output 0 Connected to the COM-E Carrier Board
GPIO 5 Output 0 Connected to the COM-E Carrier Board
GPIO 6 Output 0 Connected to the COM-E Carrier Board
GPIO 7 Output 0 Connected to the COM-E Carrier Board
GPIO 8 Multiplex as SDHC_CD: which is used to
check if the SD insert or not.
GPIO 9 Multiplex as SDHC_WP: which is used
to check the SD is write protect or not.
GPIO 10 Output 0 It can be used to clear WDT timer.
If the pin is set to 1, the WDT timer will
be cleared.
GPIO 11 Input Connect to COM-E Carry board
GPIO 12 Output 1 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
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.
GPIO 13 Input Connect to COM-E Carry board.
GPIO 14 Output Connect to COM-E Carry board
GPIO 15 Input Connect to COM-E Carry board