On Tuesday 12 January 2010, Alexei Babich wrote:
> Error: 'arm11 target' JTAG error SCREG OUT 0x1f
> Error: 'arm11 target' JTAG error SCREG OUT 0x1f
> Error: 'arm11 target' JTAG error SCREG OUT 0x1f
> Error: DPM REG READ -- fail -4
> Error: 'arm11 target' JTAG error SCREG OUT 0x1f
> Error: 'arm11 target' JTAG error SCREG OUT 0x1f
> ...
> What can it be?

The real quick answer is that for some reason you're
receiving all-ones (0x1f) back from a JTAG scan while
switching to another scan chain ... when the chip
is required to return a different value (0x10).

I'd guess it's trying to read a register like DSCR,
polling for status changes, but that's just a guess
at this point.

Now, that version you're using isn't all that old,
and I don't think anything much has changed since
then in that area, but you should try this with
the latest code.

Also, try to get us more information by posting
a "debug_level 3" log.

- Dave

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