projects / J-u-boot.git / blame
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|---|---|---|
| e2211743 WD |
1 | /* |
| 2 | * (C) Copyright 2001 | |
| 3 | * Denis Peter, MPL AG Switzerland | |
| 4 | * | |
| 5 | * See file CREDITS for list of people who contributed to this | |
| 6 | * project. | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or | |
| 9 | * modify it under the terms of the GNU General Public License as | |
| 10 | * published by the Free Software Foundation; either version 2 of | |
| 11 | * the License, or (at your option) any later version. | |
| 12 | * | |
| 13 | * This program is distributed in the hope that it will be useful, | |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 16 | * GNU General Public License for more details. | |
| 17 | * | |
| 18 | * You should have received a copy of the GNU General Public License | |
| 19 | * along with this program; if not, write to the Free Software | |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
| 21 | * MA 02111-1307 USA | |
| 22 | * | |
| 23 | */ | |
| 24 | ||
| 25 | USB Support for PIP405 and MIP405 (UHCI) | |
| 26 | ======================================== | |
| 27 | ||
| 28 | The USB support is implemented on the base of the UHCI Host | |
| 29 | controller. | |
| 30 | ||
| 31 | Currently supported are USB Hubs, USB Keyboards and USB Floppys. | |
| 32 | Tested with a TEAC Floppy TEAC FD-05PUB and Chicony KU-8933 Keyboard. | |
| 33 | ||
| 34 | How it works: | |
| 35 | ------------- | |
| 36 | ||
| 37 | The USB (at least the USB UHCI) needs a frame list (4k), transfer | |
| 38 | descripor and queue headers which are all located in the main memory. | |
| 39 | The UHCI allocates every milisecond the PCI bus and reads the current | |
| 40 | frame pointer. This may cause to crash the OS during boot. So the USB | |
| 41 | _MUST_ be stopped during OS boot. This is the reason, why the USB is | |
| 42 | NOT automatically started during start-up. If someone needs the USB | |
| 43 | he has to start it and should therefore be aware that he had to stop | |
| 44 | it before booting the OS. | |
| 45 | ||
| 46 | For USB keyboards this can be done by a script which is automatically | |
| 47 | started after the U-Boot is up and running. To boot an OS with a an | |
| 48 | USB keyboard another script is necessary, which first disables the | |
| 49 | USB and then executes the boot command. If the boot command fails, | |
| 50 | the script can reenable the USB kbd. | |
| 51 | ||
| 52 | Common USB Commands: | |
| 53 | - usb start: | |
| 54 | - usb reset: (re)starts the USB. All USB devices will be | |
| 55 | initialized and a device tree is build for them. | |
| 56 | - usb tree: shows all USB devices in a tree like display | |
| 57 | - usb info [dev]: shows all USB infos of the device dev, or of all | |
| 58 | the devices | |
| 59 | - usb stop [f]: stops the USB. If f==1 the USB will also stop if | |
| 60 | an USB keyboard is assigned as stdin. The stdin | |
| 61 | is then switched to serial input. | |
| 62 | Storage USB Commands: | |
| 63 | - usb scan: scans the USB for storage devices.The USB must be | |
| 64 | running for this command (usb start) | |
| 65 | - usb device [dev]: show or set current USB staorage device | |
| 66 | - usb part [dev]: print partition table of one or all USB storage | |
| 67 | devices | |
| 68 | - usb read addr blk# cnt: | |
| 69 | read `cnt' blocks starting at block `blk#'to | |
| 70 | memory address `addr' | |
| 71 | - usbboot addr dev:part: | |
| 72 | boot from USB device | |
| 73 | ||
| 74 | Config Switches: | |
| 75 | ---------------- | |
| b3aff0cb JL |
76 | CONFIG_CMD_USB enables basic USB support and the usb command |
| 77 | CONFIG_USB_UHCI defines the lowlevel part.A lowlevel part must be defined | |
| 78 | if using CONFIG_CMD_USB | |
| e2211743 WD |
79 | CONFIG_USB_KEYBOARD enables the USB Keyboard |
| 80 | CONFIG_USB_STORAGE enables the USB storage devices |