19 serdes – Artesyn COMX-P40x0 ENP2 Installation and Use (January 2015) User 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
. 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 <option#>" 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 <option#>
-
active <option#> RCW. <option#> 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).
<option#> range [1..12]