Calypso JTAG access?

joerg Reisenweber joerg at
Sun May 3 18:55:53 UTC 2015

On Sun 03 May 2015 18:29:33 Spacefalcon the Outlaw wrote:
> Hello,
> I'm developing new GSM firmware for the Calypso (,
> and I could really use the help of JTAG for debugging.  However,
> unless I'm missing something, it appears that the Calypso's JTAG
> signals are not accessible on GTA02 hardware. :-(  They are shown as
> unconnected on the GTA02_Schematic_MB_A5_1220.pdf schematics, and
> looking at the GTA02_MB_A6 gerbers which Sean recently released, I see
> that the pads under the Calypso's JTAG balls are not wired to anything
> at all, i.e., totally unconnected and inaccessible. :-(
> However, the ZIP with design files which Sean dug up for us covers A1
> through A6; GTA02A7 is not in there.  Would anyone happen to know if
> perchance the Calypso JTAG signals are brought out to some accessible
> test points on GTA02A7 or some other GTA02 or GTA01 version?
> TIA,
> SF

No layout changes regarding JTAG been applied to A7, *maybe* the #1024 routing 
bug got fixed, though I doubt.

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