Sd Card; Usb; Pci Express - SMART Embedded Computing COMX-P2020 BSP User Manual

U-boot Deployment
5.4.10

SD Card

The U-boot provides the standard command "mmc" to check, read, erase and write SD
Card. This part is not included in this document.
=> help mmc
mmc - MMC sub system
Usage:
mmc read <device num> addr blk# cnt
mmc write <device num> addr blk# cnt
mmc rescan <device num>
mmc list - lists available devices
5.4.11

USB

COMX-P2020 implements a dual-role (DR) USB module. This module is connected to
USB2514i which can provide 4 downstream ports. U-boot can scan the USB devices which
connected with USB2514i. If the device is a storage device, then U-boot can read and write
the block of the device.
The U-boot provides standard command: usb to find and read USB storage devices. This
part is not included in this document.
=> help usb
usb - USB sub-system
Usage:
usb reset - reset (rescan) USB controller
usb stop [f] - stop USB [f]=force stop
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 follows:
62 COMX-P2020 BSP User Guide (6806800L84C)
U-boot Deployment