Artesyn COMX-P40x0 ENP2 Installation and Use (January 2015) - Manual (Page 118)

BSP
COMX-P40x0 ENP2 Installation and Use (6806800R95C) 118
7.19 SerDes
The COMX-P40x0 ENP2 module has three Serializer/Deserializer (SerDes) banks, including a
total of 18 lanes.
For more information on the SerDes, see SerDes Block on page 72 . This includes the SerDes lane
distribution and options when it is routed to the COM Express connectors.
U-Boot provides "rcw" utilities to switch SerDes lanes among the twelve SerDes/RCW options.
A checking feature is also supported. Below is a usage sample of the utilities.
The steps below are used to activate specific SerDes/RCW options.
 Run "rcw active " to activate the SerDes/RCW option#.
 Power off the board.
 For RCW options #7 or #8, a means to change the SerDes clock settings must be provided
by the customer's carrier board.
 Power up the board.
rcw list - Lists the status of RCW sections
rcw active - active RCW. range [1..12]
rcw check current - Checks the current RCW with which system boots up
rcw check active - Checks the status of the active RCW section
rcw check backup
[option#] - Checks the status of all or # backup RCW section(s).
range [1..12]