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18.3.5 OpenRISC 1000

See OR1k Architecture document ( for more information about platform and commands.

target jtag jtag://host:port

Connects to remote JTAG server. JTAG remote server can be either an or1ksim or JTAG server, connected via parallel port to the board.

Example: target jtag jtag://localhost:9999

or1ksim command

If connected to or1ksim OpenRISC 1000 Architectural Simulator, proprietary commands can be executed.

info or1k spr

Displays spr groups.

info or1k spr group
info or1k spr groupno

Displays register names in selected group.

info or1k spr group register
info or1k spr register
info or1k spr groupno registerno
info or1k spr registerno

Shows information about specified spr register.

spr group register value
spr register value
spr groupno registerno value
spr registerno value

Writes value to specified spr register.

Some implementations of OpenRISC 1000 Architecture also have hardware trace. It is very similar to No value for GDBN trace, except it does not interfere with normal program execution and is thus much faster. Hardware breakpoints/watchpoint triggers can be set using:


Load effective address/data


Store effective address/data


Access effective address ($SEA or $LEA) or data ($SDATA/$LDATA)


Fetch data

When triggered, it can capture low level data, like: PC, LSEA, LDATA, SDATA, READSPR, WRITESPR, INSTR.

htrace commands:

hwatch conditional

Set hardware watchpoint on combination of Load/Store Effective Address(es) or Data. For example:

hwatch ($LEA == my_var) && ($LDATA < 50) || ($SEA == my_var) && ($SDATA >= 50)

hwatch ($LEA == my_var) && ($LDATA < 50) || ($SEA == my_var) && ($SDATA >= 50)

htrace info

Display information about current HW trace configuration.

htrace trigger conditional

Set starting criteria for HW trace.

htrace qualifier conditional

Set acquisition qualifier for HW trace.

htrace stop conditional

Set HW trace stopping criteria.

htrace record [data]*

Selects the data to be recorded, when qualifier is met and HW trace was triggered.

htrace enable
htrace disable

Enables/disables the HW trace.

htrace rewind [filename]

Clears currently recorded trace data.

If filename is specified, new trace file is made and any newly collected data will be written there.

htrace print [start [len]]

Prints trace buffer, using current record configuration.

htrace mode continuous

Set continuous trace mode.

htrace mode suspend

Set suspend trace mode.

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