mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-19 03:08:31 +00:00
b3aff0cb9e
Fixed some broken instances of "#ifdef CMD_CFG_IDE" too. Those always evaluated TRUE, and thus were always compiled even when IDE really wasn't defined/wanted. Signed-off-by: Jon Loeliger <jdl@freescale.com>
80 lines
3.1 KiB
Text
80 lines
3.1 KiB
Text
/*
|
|
* (C) Copyright 2001
|
|
* Denis Peter, MPL AG Switzerland
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
USB Support for PIP405 and MIP405 (UHCI)
|
|
========================================
|
|
|
|
The USB support is implemented on the base of the UHCI Host
|
|
controller.
|
|
|
|
Currently supported are USB Hubs, USB Keyboards and USB Floppys.
|
|
Tested with a TEAC Floppy TEAC FD-05PUB and Chicony KU-8933 Keyboard.
|
|
|
|
How it works:
|
|
-------------
|
|
|
|
The USB (at least the USB UHCI) needs a frame list (4k), transfer
|
|
descripor and queue headers which are all located in the main memory.
|
|
The UHCI allocates every milisecond the PCI bus and reads the current
|
|
frame pointer. This may cause to crash the OS during boot. So the USB
|
|
_MUST_ be stopped during OS boot. This is the reason, why the USB is
|
|
NOT automatically started during start-up. If someone needs the USB
|
|
he has to start it and should therefore be aware that he had to stop
|
|
it before booting the OS.
|
|
|
|
For USB keyboards this can be done by a script which is automatically
|
|
started after the U-Boot is up and running. To boot an OS with a an
|
|
USB keyboard another script is necessary, which first disables the
|
|
USB and then executes the boot command. If the boot command fails,
|
|
the script can reenable the USB kbd.
|
|
|
|
Common USB Commands:
|
|
- usb start:
|
|
- usb reset: (re)starts the USB. All USB devices will be
|
|
initialized and a device tree is build for them.
|
|
- usb tree: shows all USB devices in a tree like display
|
|
- usb info [dev]: shows all USB infos of the device dev, or of all
|
|
the devices
|
|
- usb stop [f]: stops the USB. If f==1 the USB will also stop if
|
|
an USB keyboard is assigned as stdin. The stdin
|
|
is then switched to serial input.
|
|
Storage USB Commands:
|
|
- usb scan: scans the USB for storage devices.The USB must be
|
|
running for this command (usb start)
|
|
- usb device [dev]: show or set current USB staorage 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'
|
|
- usbboot addr dev:part:
|
|
boot from USB device
|
|
|
|
Config Switches:
|
|
----------------
|
|
CONFIG_CMD_USB enables basic USB support and the usb command
|
|
CONFIG_USB_UHCI defines the lowlevel part.A lowlevel part must be defined
|
|
if using CONFIG_CMD_USB
|
|
CONFIG_USB_KEYBOARD enables the USB Keyboard
|
|
CONFIG_USB_STORAGE enables the USB storage devices
|