uboot下的命令使用示例

1.usb 可以使用此命令读取u盘里的内容,此命令加上相关参数可以有以下功能：

1.1usb start 在使用u盘之前必须启动此命令以初始化好fat文件系统环境，笔者的输出如下:

1.2 usb dev 查看检测到的usb设备,笔者的输出如下:

USB device 0: Vendor: Lexar Rev: 1100 Prod: USB Flash Drive
Type: Removable Hard Disk
Capacity: 3824.0 MB = 3.7 GB (7831552 x 512)

1.3 usb info可列出usb host的属性,笔者的输出如下:

2: Hub, USB Revision 2.0
- USB2.0 Hub
- Class: Hub
- PacketSize: 64 Configurations: 1
- Vendor: 0x05e3 Product 0x0608 Version 133.54
Configuration: 1
- Interfaces: 1 Self Powered Remote Wakeup 100mA
Interface: 0
- Alternate Setting 0, Endpoints: 1
- Class Hub
- Endpoint 1 In Interrupt MaxPacket 1 Interval 255ms

3: Hub, USB Revision 2.0
- USB2.0 Hub
- Class: Hub
- PacketSize: 64 Configurations: 1
- Vendor: 0x05e3 Product 0x0608 Version 133.54
Configuration: 1
- Interfaces: 1 Self Powered Remote Wakeup 100mA
Interface: 0
- Alternate Setting 0, Endpoints: 1
- Class Hub
- Endpoint 1 In Interrupt MaxPacket 1 Interval 255ms

4: Mass Storage, USB Revision 2.0
- Lexar USB Flash Drive AA066NWLMLMLBQPX
- Class: (from Interface) Mass Storage
- PacketSize: 64 Configurations: 1
- Vendor: 0x05dc Product 0xa813 Version 17.0
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

5: Mass Storage, USB Revision 2.0
- Generic Ultra Fast Media 000000225001
- Class: (from Interface) Mass Storage
- PacketSize: 64 Configurations: 1
- Vendor: 0x0424 Product 0x2240 Version 1.152
Configuration: 1
- Interfaces: 1 Bus Powered 96mA
Interface: 0
- Alternate Setting 0, Endpoints: 2
- Class Mass Storage, Transp. SCSI, Bulk only
- Endpoint 2 Out Bulk MaxPacket 64
- Endpoint 2 In Bulk MaxPacket 64

1.4 usb storage 可列出u盘设备信息:

1.5 usb tree 列出设备树：

1.6 usb part 列出u盘的分区表

Partition Map for USB device 0 -- Partition Type: DOS

Partition Start Sector Num Sectors Type
1 2048 7829504 83

## Unknown partition table

2. fatls 列出fat文件系统中的内容,i其用法如下:

usage: fatls <interface> <dev[:part]> [directory] interface是指定哪种类型的设备，此处笔者用的usb设备，因此填入usb，dev就是设备号，笔者从以上命令得知为0

　　2 file(s), 3 dir(s)
3. fatload 从u盘加载文件到指定内存地址处，用法如下:

usage: fatload <interface> <dev[:part]> <addr> <filename> [bytes] interface和dev不再叙述，addr 指定要加载文件到内存的某个地址，filename指定要加载的文件名

...............................................................................

................................................................................

...................................................................................

...........................................................................

4221634 bytes read

4.sf 支持spi/qspi flash的操作,必须先擦除再写

4.1 sf probe 在操作spi flash之前必须进行此操作:

4.3 sf write 写操作:

uboot下的命令使用示例

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