usb识别问题，无法烧写内核

问题一：
昨天第一次在winxp下装usb驱动烧内核都很顺利，然而今天就不行了。usb驱动无法更新，总是显示unknow device，超级终端里的supervivi也显示usb没接上。在winxp下不知道要如何烧内核了...

问题二：
在fedora 10下面装好libusb等几个包，试了好几次，唯有一次supervivi显示usb已连接上，然而dnw2却显示usb无连接...


如今在minicom上开机按空格键以后显示内容变成这样，好像和之前不同了，不知道是否出了什么问题
----------------------------以下是终端minicom信息---------------------------------------------------------------
Welcome to minicom 2.3

OPTIONS: I18n
Compiled on Aug 29 2008, 07:16:49.
Port /dev/ttyS0

               Press CTRL-A Z for help on special keys
                                                    
                                                    
VIVI version 0.1.4 (root@vmwarelinux) (gcc version 2.95.3 20010315 (release)) #7
MMU table base address = 0x33DFC000                  
Succeed memory mapping.
DIVN_UPLL0
MPLLVal [M:7fh,P:2h,S:1h]
CLKDIVN:5h


+d USB device address.

NAND device: Manufacture ID: 0xec, Chip ID: 0x76 (Samsung K9D1208V0M)
Could not found stored vivi parameters. Use default vivi parameters.
Press Return to start the LINUX/Wince now, any other key for vivi
type "help" for help.                                                          
Supervivi>  
----------------------以上是终端minicom信息-------------------------------------------------------------------------

刚开始接触嵌入式白菜，迷茫ing....
我只是想改下声卡驱动，烧个内核，现在不知道该咋整....
请大侠为我指明前路...

开机按空格是正常的，上面应该是插了USB的缘故，不过现在严格按照用户手册，USB还是无法使用
----------------------------以下是终端信息---------------------------------------------------------------
arch_reset: attempting watchdog reset

VIVI version 0.1.4 (root@vmwarelinux) (gcc version 2.95.3 20010315 (release)) #0
.1.4 Tue Sep 4 03:48:39 CST 2007
MMU table base address = 0x33DFC000
Succeed memory mapping.
DIVN_UPLL0
MPLLVal [M:7fh,P:2h,S:1h]
CLKDIVN:5h


+---------------------------------------------+
| S3C2440A USB Downloader ver R0.03 2004 Jan  |
+---------------------------------------------+
USB: IN_ENDPOINT:1 OUT_ENDPOINT:3
FORMAT: <ADDR(DATA):4>+<SIZE(n+10):4>+<DATA:n>+<CS:2>
NOTE: Power off/on or press the reset button for 1 sec
      in order to get a valid USB device address.

NAND device: Manufacture ID: 0xec, Chip ID: 0x76 (Samsung K9D1208V0M)
Could not found stored vivi parameters. Use default vivi parameters.
Press Return to start the LINUX/Wince now, any other key for vivi
type "help" for help.
Supervivi>
----------------------以上是终端信息-------------------------------------------------------------------------