u-boot中的usb命令

1. 使用 (帮助信息）

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

1.2usb 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

1.3usb 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

1.4usb 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. 源代码分析

common/cmd_usb.c

2.1 usb start / usb reset 命令代码执行

[ 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 命令代码执行

[ 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;