u-boot中的usb命令

[u-boot: v2013.04]

[Author: Bo Shen [email protected]]

1. 使用 (幫助信息）

U-Boot > usb usb - USB sub-system   Usage: usb start - start (scan) USB controller 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' usb write addr blk# cnt - write `cnt' blocks starting at block `blk#' from memory address `addr'

1.1usb start / usb reset

U-Boot> usb start (Re)start USB... USB0: scanning bus 0 for devices... 2 USB Device(s) found scanning usb for storage devices... 1 Storage Device(s) found

1.2 usb tree

U-Boot> usb tree

USB device tree: 1 Hub (12 Mb/s, 0mA) | OHCI Root Hub | +-2 Mass Storage (12 Mb/s, 200mA) Kingston DataTraveler G3 001372982955EBC0C5AB0019

1.3 usb info (usb info 1 / usb info 2)

U-Boot> usb info 1: Hub, USB Revision 1.10 - OHCI Root Hub - Class: Hub - PacketSize: 8 Configurations: 1 - Vendor: 0x0000 Product 0x0000 Version 0.0 Configuration: 1 - Interfaces: 1 Self Powered 0mA Interface: 0 - Alternate Setting 0, Endpoints: 1 - Class Hub - Endpoint 1 In Interrupt MaxPacket 2 Interval 255ms   2: Mass Storage, USB Revision 2.0 - Kingston DataTraveler G3 001372982955EBC0C5AB0019 - Class: (from Interface) Mass Storage - PacketSize: 64 Configurations: 1 - Vendor: 0x0930 Product 0x6545 Version 1.0 Configuration: 1 - Interfaces: 1 Bus Powered 200mA Interface: 0 - Alternate Setting 0, Endpoints: 2 - Class Mass Storage, Transp. SCSI, Bulk only - Endpoint 1 In Bulk MaxPacket 64 - Endpoint 2 Out Bulk MaxPacket 64
1.4 usb dev U-Boot> usb dev   USB device 0: Vendor: Kingston Rev: PMAP Prod: DataTraveler G3 Type: Removable Hard Disk Capacity: 7441.6 MB = 7.2 GB (15240576 x 512)

2. 源代碼分析

<common/cmd_usb.c>

2.1 usb start / usb reset 命令代碼執行

[ strncmp(argv[1], "start", 5) == 0 ] / [ strncmp(argv[1], "reset", 5) == 0 ] --> usb_stop() --> usb_init() --> usb_stor_scan(1) (CONFIG_USB_STORAGE) --> usb_host_eth_scan(1) (CONFIG_USB_HOST_ETHER) --> drv_usb_kbd_init() (CONFIG_USB_KEYBOARD) --> return 0;

2.2 usb stop 命令代碼執行

[ strncmp(argv[1], "stop", 4) == 0 ] --> (CONFIG_USB_KEYBOARD) [ argc == 2 ] --> usb_kbd_deregister() --> usb_stop --> return 0;

[ strncmp(argv[1], "stop", 4) == 0 ] --> (CONFIG_USB_KEYBOARD) [ argc != 2 ] --> console_assign(stdin, "serial") --> usb_kbd_deregister() --> usb_stop --> return 0;