main clock and flash state problem

OP #1173778 
i am use openocd with usb jtag based on ft2232 board layout usbjtag
and my mini arm modul with at91sam7s256
comunication betwen arm and pc via jtag seems to be ok
jtag chain communication without problem
if i write command flash info 0 chip was detected but master clock is 0
kHZ WHY??
1
> flash info 0

2
#0: at91sam7 at 0x00100000, size 0x00040000, buswidth 4, chipwidth 0

3
        #0: 0x00000000 (0x40000 256kB) protection state unknown

4


5
at91sam7 information: Chip is AT91SAM7S256

6
cidr: 0x270d0940, arch: 0x0070, eproc: ARM7TDMI, version:0x000,

7
flashsize: 0x00040000

8
master clock(estimated): 0kHz

9
pagesize: 256, lockbits: 16 0x0000, pages in lock region: 64

10
securitybit: 0,  nvmbits(2): 0x0


why master clock is zero ?
why protection state is unknown ?
What is the reason of this ??
I use openocd ver Open On-Chip Debugger 1.0 (2008-05-04-17:13) svn:640
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