> If I set to 20khz, I get perfect debugging no errors ..

I have found that the JTAG clock needs to be *really* low
when the system is running off an RC oscillator. Once on a
PLL, you can crank up the speed. This was observed on an
LPC1768, but also one other system I fail to recall which...

RCLK is implemented on some systems that have RC oscillators, but
here I've found the RCLK frequency to be unreliable.

Why this would be, I have no idea...

-- 
Øyvind Harboe
US toll free 1-866-980-3434 / International +47 51 63 25 00
http://www.zylin.com/zy1000.html
ARM7 ARM9 ARM11 XScale Cortex
JTAG debugger and flash programmer
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