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authorDavid Brownell <dbrownell@users.sourceforge.net>2009-10-26 00:36:03 -0700
committerDavid Brownell <dbrownell@users.sourceforge.net>2009-10-26 00:36:03 -0700
commit6cb1d10cdad509939e3decf089e08c289d85d5cf (patch)
treead1b0c30d9b95c0ee34594a0f538bd68133efe2e /src/flash/at91sam3.h
parent0cac8b67be5c6f6f5b2bc3a86f78d4d02e364792 (diff)
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JTAG: simple autoprobing
This patch adds basic autoprobing support for the JTAG scan chains which cooperate. To use, you can invoke OpenOCD with just: - interface spec: "-f interface/...cfg" - possibly with "-c 'reset_config ...'" for SRST/TRST - possibly with "-c 'jtag_khz ...'" for the JTAG clock Then set up config files matching the reported TAPs. It doesn't declare targets ... just TAPs. So facilities above the JTAG and SVF/XSVF levels won't be available without a real config; this is almost purely a way to generate diagnostics. Autoprobe was successful with most boards I tested, except ones incorporating C55x DSPs (which don't cooperate with this scheme for IR length autodetection). Here's what one multi-TAP chip reported, with the "Warn:" prefixes removed: clock speed 500 kHz There are no enabled taps. AUTO PROBING MIGHT NOT WORK!! AUTO auto0.tap - use "jtag newtap auto0 tap -expected-id 0x2b900f0f ..." AUTO auto1.tap - use "jtag newtap auto1 tap -expected-id 0x07926001 ..." AUTO auto2.tap - use "jtag newtap auto2 tap -expected-id 0x0b73b02f ..." AUTO auto0.tap - use "... -irlen 4" AUTO auto1.tap - use "... -irlen 4" AUTO auto2.tap - use "... -irlen 6" no gdb ports allocated as no target has been specified The patch tweaks IR setup a bit, so we can represent TAPs with undeclared IR length. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
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