Forum: ARM programming with GCC/GNU tools main clock and flash state problem

Author: Miroslav Talasek (miroslav-talasek)
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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

> flash info 0
#0: at91sam7 at 0x00100000, size 0x00040000, buswidth 4, chipwidth 0
        #0: 0x00000000 (0x40000 256kB) protection state unknown

at91sam7 information: Chip is AT91SAM7S256
cidr: 0x270d0940, arch: 0x0070, eproc: ARM7TDMI, version:0x000,
flashsize: 0x00040000
master clock(estimated): 0kHz
pagesize: 256, lockbits: 16 0x0000, pages in lock region: 64
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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