Did you read:
> help adapter_khz
adapter_khz [khz]
With an argument, change to the specified maximum jtag speed. For
JTAG, 0 KHz signifies adaptive clocking. With or without argument,
display current setting. (command valid any time)
> help jtag_rclk
jtag_rclk [fallback_speed_khz]
With an argument, change to to use adaptive clocking if possible;
else to use the fallback speed. With or without argument, display
current setting. (command valid any time)
?
The idea is that adapter_khz should set a speed equal to or lower
than the argument. If the adapter can't do as high as requested,
no problem => it will set a lower speed in the target script. If the
adapter driver is correctly implemented that is.
Target scripts without a adapter_khz should be fixed to have one,
otherwise the khz is undefined.
If a card *could* support RCLK, then use jtag_rclk instead. It will
default to rclk if the adapter supports it, otherwise use the khz
specified by the script.
--
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