Artesyn COMX-P2020 BSP User Guide (July 2014) - Manual (Page 63)

U-boot Deployment
COMX-P2020 BSP User Guide (6806800L84B) 63
usb tree - show USB device tree
usb info [dev] - show available USB devices
usb storage - show details of USB storage devices
usb dev [dev] - show or set current USB storage device
usb part [dev] - print partition table of one or all USB storage
devices
usb read addr blk# cnt - read `cnt' blocks starting at block `blk#'
to memory address `addr'
5.4.12 PCI Express
There are three PCI Express controllers at COMX-P2020: the PCI Express 1 is connected to GPU
Z11M, the other two are connected to the carrier board. The U-boot will scan and show the PCI
devices when booting as below:
PCIE3 connected to Slot0 as Root Complex (base addr ffe08000)
Current Status: LSR-11, LTSSM-16, PEX width-x1, Clock-2.5GT/s
Scanning PCI bus 01
01 00 8086 107d 0200 00
PCIE3 on bus 00 - 01
PCIE2 connected to Slot 1 as Root Complex (base addr ffe09000)
PCIE2 on bus 02 - 02
PCIE1 connected to Slot 2 as Root Complex (base addr ffe0a000)
Current Status: LSR-11, LTSSM-16, PEX width-x1, Clock-2.5GT/s
Scanning PCI bus 04
04 00 18ca 0027 0300 00