使用 TTL 方式連接

U-Boot

U-Boot: printenv

PDK7105> printenv
bootdelay=0
baudrate=115200
ethaddr=DE:EA:FF:FF:01:01
board=pdk7105
monitor_base=0xA4000000
monitor_len=0x00040000
monitor_sec=1:0-1
load_addr=0x80000000
ipaddr=192.9.150.61
serverip=192.9.150.67
bootdelay=0
update_uboot=usb start;fatload usb 0 80000000 u-boot.bin;update_spi_uboot
unprot=protect off $monitor_sec
update=erase $monitor_sec;cp.b $load_addr $monitor_base $monitor_len;protect on $monitor_sec
ethaddr=12:34:56:78:06:BD
stdin=serial
stdout=serial
stderr=serial
bootargs=console=ttyAS0,115200 root=8:2  rootfstype=ext3 rw rootflags=data=journal nwhwconf=device:eth0,hwaddr:10:08:E2:12:06:BD phyaddr:0,watchdog:5000 mem=120M bigphysarea=2048
bootcmd=ext2load usb 0:2 80000000 vmlinux.ub; bootm 80000000

Environment size: 715/65532 bytes

USB 相關

PDK7105> help usb
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'

PDK7105> usb dev

USB device 0: Vendor: General  Prod.: USB Flash Disk   Rev: 1100
            Type: Removable Hard Disk
            Capacity: 7656.0 MiB = 7.4 GiB (15679488 x 512)

PDK7105> usb part 0
print_part of 0

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

Partition     Start Sector     Num Sectors     Type
    1                   19          617101      83
    2               617120          617120      83
    3              1234240        12585600      83
    4             13819840         1802720      83

print_part of 1
## Unknown partition table

print_part of 2
## Unknown partition table

print_part of 3
## Unknown partition table

print_part of 4
## Unknown partition table

如何套用新的 linux kernel

setenv bootcmd 'ext2load usb 0:2 80000000 vmlinux-1.ub; bootm 80000000'
boot 

TIPs：

新編譯的 linux kernel: vmlinux-1.ub 必須放在 / 目錄下

參考連結

• 網樂通改成 Linux
• 常用 U-boot 命令詳解
• U-Boot Documentation
• Cubieboard/TTL