On Tue, Aug 26, 2008 at 8:23 PM, Spen <[EMAIL PROTECTED]> wrote: >> >> >> >> STR912 now uses RCLK if available. >> >> >> > >> > Could i ask why? Because using rclk is slower. >> >> Is it? > > it has been on all the interfaces i have tested over the years. > > Even arm and segger mention this in their docs, if you have a fast jtag tool > in theory it should be as close to the max possible clock. in practice using > correctly configured jtag clock has always been quicker.
So for those interfaces where this *is* the case, then jtag_rclk does not make sense and jtag_khz is still the way to go. For LPC2148 and STR912, they maxed out about the same frequency AFAICT. I *suspect* that RCLK is more robust that eeking a few more khz out of the communication line and a near top speed & robust is better than something faster & potentially flaky as a default. Again: you can override the behaviour of jtag_rclk easily enough. -- Øyvind Harboe http://www.zylin.com/zy1000.html ARM7 ARM9 XScale Cortex JTAG debugger and flash programmer _______________________________________________ Openocd-development mailing list [email protected] https://lists.berlios.de/mailman/listinfo/openocd-development
