| 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980 |
- /*
- * (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:
- ----------------
- CFG_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 CFG_CMD_USB
- CONFIG_USB_KEYBOARD enables the USB Keyboard
- CONFIG_USB_STORAGE enables the USB storage devices
|
