Dne Po 31. května 2010 09:49:18 Mars Steeve napsal(a):
> Hi Marek,
> 
> I finally received my JTAG KEY Tiny and successfully compiled OpenOCD 0.4.0
> with your patches.
> 
> Unfortunately, I'm unable to flash or debug my board (colibri pxa320), the
> CPU is never halted.
> 
> I post the result of "reset halt".
> 
> $ openocd -f interface/jtagkey-tiny.cfg -f board/colibri_pxa320.cfg
> 
> > reset halt
> 
> JTAG tap: colibri_pxa320.cpu tap/device found: 0x7e642013 (mfg: 0x009,
> part: 0xe642, ver: 0x7) Bad value '00' captured during DR or IR scan:
>  check_value: 0x02
>  check_mask: 0x07
> JTAG error while writing DCSR
> Bad value '00' captured during DR or IR scan:
>  check_value: 0x02
>  check_mask: 0x06
> JTAG error while reading TX
> error while polling TX register, reset CPU
> target state: halted
> target halted in ARM state due to target-not-halted, current mode: User
> cpsr: 0x00000000 pc: 0x00000000
> MMU: disabled, D-Cache: disabled, I-Cache: disabled
> 
> Thanks for your help!

I saw this with my vpaclink on Zylonite PXA320. By using the homemade JTAGkey, 
it worked. I assume there's a problem with not enough drive strength on some 
JTAG adapters. Maybe try adding a buffer past the adapter.
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