Update FT2232 driver so that it reliably enters TAP_RESET.
authordbrownell <dbrownell@b42882b7-edfa-0310-969c-e2dbd0fdcd60>
Sun, 27 Sep 2009 16:55:52 +0000 (16:55 +0000)
committerdbrownell <dbrownell@b42882b7-edfa-0310-969c-e2dbd0fdcd60>
Sun, 27 Sep 2009 16:55:52 +0000 (16:55 +0000)
commit817ea3f4e445a616c50d5658a2ec84e41cab3f1f
tree7eab1b32fa3b0f9d2f9b412e651b90495f35ab31
parentfbbd3066ffb17b3a5a75b882c4b16aeaa6acad88
Update FT2232 driver so that it reliably enters TAP_RESET.

When the OpenOCD server starts up it records its state as TAP_RESET,
even though it could be anything.  Then when it starts to examine
the scan chain, it calls jtag_add_tlr() which sees it doesn't have
any work to do, and so it does nothing.  This can make the next
operations fail because they start from the wrong TAP state...

Instead of caring about the current recorded state, always enter
TAP_RESET by forcing five clocks with TMS high.

(NOTE:  it seems most other JTAG adapter drivers have this same bug.)

git-svn-id: svn://svn.berlios.de/openocd/trunk@2763 b42882b7-edfa-0310-969c-e2dbd0fdcd60
src/jtag/ft2232.c

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