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topic: Support for the Xilinx BSCAN_* Virtual JTAG in Openrisc

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This add support to the Xilinx BSCAN_* virtual JTAG interface.
This is the Xilinx equivalent of the Altera sld_virtual_jtag interface,
it allows a user to connect to the debug unit through the main
FPGA JTAG connection.

Change-Id: Ia438e910650cff9cbc8f810b719fc1d5de5a8188
Signed-off-by: Sergio Chico <sergio.chico@gmail.com>
Reviewed-on: http://openocd.zylin.com/1806
Tested-by: jenkins
Reviewed-by: Franck Jullien <franck.jullien@gmail.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
This commit is contained in:
Sergio Chico
2013-11-10 16:03:40 +01:00
committed by Andreas Fritiofson
parent 2d64cf92ae
commit 93a3a82e49
7 changed files with 95 additions and 6 deletions
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7
doc/openocd.texi
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@@ -4181,10 +4181,11 @@ There are several variants defined:
@item @code{pxa3xx} ... instruction register length is 11 bits
@end itemize
@item @code{openrisc} -- this is an OpenRISC 1000 core.
The current implementation supports two JTAG TAP cores:
The current implementation supports three JTAG TAP cores:
@itemize @minus
@item @code{OpenCores TAP} (See: @emph{http://opencores.org/project,jtag})
@item @code{Altera Virtual JTAG TAP} (See: @emph{http://www.altera.com/literature/ug/ug_virtualjtag.pdf})
@item @code{Xilinx BSCAN_* virtual JTAG interface} (See: @emph{http://www.xilinx.com/support/documentation/sw_manuals/xilinx14_2/spartan6_hdl.pdf})
@end itemize
And two debug interfaces cores:
@itemize @minus
@@ -7517,8 +7518,8 @@ The OpenRISC CPU is a soft core. It is used in a programmable SoC which can be
configured with any of the TAP / Debug Unit available.
@subsection TAP and Debug Unit selection commands
@deffn Command {tap_select} (@option{vjtag}|@option{mohor})
Select between the Altera Virtual JTAG and Mohor TAP.
@deffn Command {tap_select} (@option{vjtag}|@option{mohor}|@option{xilinx_bscan})
Select between the Altera Virtual JTAG , Xilinx Virtual JTAG and Mohor TAP.
@end deffn
@deffn Command {du_select} (@option{adv}|@option{mohor}) [option]
Select between the Advanced Debug Interface and the classic one.