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十六、下载与烧写
使用U-boot将映像文件烧写到板上的Flash，一般步骤是：
（1）通过网络、串口、U盘、SD卡等方式将文件传输到SDRAM；
（2）使用Nand Flash或Nor Flash相关的读写命令将SDRAM中的数据烧入Flash。
下面是烧写范例：
如果使用 SD卡和U盘形式更新U-boot，那么首先SD卡和U盘中必须有FAT32文件系统，并在里面存放了u-boot.bin 文件。
1) 通过SD卡烧入Nand Flash：
[u-boot@MINI2440]# mmc init
mmc: Probing for SDHC ...
mmc: SD 2.0 or later card found
trying to detect SD Card...
Manufacturer:
0x00, OEM " roduct name:
"
", revision 0.0
Serial number:
7864775
Manufacturing date: 11/2006
CRC:
0x4f, b0 = 1
READ_BL_LEN=6, C_SIZE_MULT=7, C_SIZE=4095
size = 0
SD Card detected RCA: 0x2 type: SD
mmc1 is available
[u-boot@MINI2440]# fatload mmc 1 0x30008000 u-boot.bin
reading u-boot.bin
256220 bytes read
[u-boot@MINI2440]# nand erase 0 0x40000
NAND erase: device 0 offset 0x0, size 0x40000
Erasing at 0x2000000000004 --
0% complete.
OK
[u-boot@MINI2440]# nand write 0x30008000 0 0x40000
NAND write: device 0 offset 0x0, size 0x40000
Writing at 0x2000000020000 -- 100% is complete. 262144 bytes written: OK |
2) 通过U盘烧入Nor Flash：
[u-boot@MINI2440]# usb start
(Re)start USB...
USB:
scanning bus for devices... 2 USB Device(s) found
scanning bus for storage devices... 1 Storage Device(s) found
[u-boot@MINI2440]# usb storage
Device 0: Vendor: Kingston Rev: PMAP Prod: DT 101 II
Type: Removable Hard Disk
Capacity: 3875.0 MB = 3.7 GB (7936000 x 512)
[u-boot@MINI2440]# usb part 0
print_part of 0
Partition Map for USB device 0
--
Partition Type: DOS
Partition
Start Sector
Num Sectors
Type
4
63
7935937
c
[u-boot@MINI2440]# fatload usb 0:4 0x30008000 u-boot.bin
reading u-boot.bin
........................
256220 bytes read
[u-boot@MINI2440]# protect off all
Un-Protect Flash Bank # 1
[u-boot@MINI2440]# erase 0x0 0x3ffff
Erasing sector
0 ... ok.
Erasing sector
1 ... ok.
Erasing sector
2 ... ok.
Erasing sector
3 ... ok.
Erased 4 sectors
[u-boot@MINI2440]# cp.b 0x30008000 0x0
0x3ffff
Copy to Flash... done |
3) 通过TFTP服务烧入Nand Flash：
[u-boot@MINI2440]# tftpboot 30008000 192.168.1.100:u-boot.bin
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:08:11:18:12:27
operating at 100M full duplex mode
Using dm9000 device
TFTP from server 192.168.1.100; our IP address is 192.168.1.101
Filename 'u-boot.bin'.
Load address: 0x30008000
Loading: T ##################
done
Bytes transferred = 256220 (3e8dc hex)
[u-boot@MINI2440]# nand erase 0 0x40000
NAND erase: device 0 offset 0x0, size 0x40000
Erasing at 0x2000000000004 --
0% complete.
OK
[u-boot@MINI2440]# nand write 0x30008000 0 0x40000
NAND write: device 0 offset 0x0, size 0x40000
Writing at 0x2000000020000 -- 100% is complete. 262144 bytes written: OK |
4) 通过NFS 服务烧入Nand Flash：
[u-boot@MINI2440]# nfs 30008000 192.168.1.100:/home/tekkaman/development/share/u-boot.bin
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:08:11:18:12:27
operating at 100M full duplex mode
Using dm9000 device
File transfer via NFS from server 192.168.1.100; our IP address is 192.168.1.101
Filename '/home/tekkaman/development/share/u-boot.bin'.
Load address: 0x30008000
Loading: ###################################################
done
Bytes transferred = 256220 (3e8dc hex)
[u-boot@MINI2440]# nand erase 0 0x40000
NAND erase: device 0 offset 0x0, size 0x40000
Erasing at 0x2000000000004 --
0% complete.
OK
[u-boot@MINI2440]# nand write 0x30008000 0 0x40000
NAND write: device 0 offset 0x0, size 0x40000
Writing at 0x2000000020000 -- 100% is complete. 262144 bytes written: OK |
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