microwatt

You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

History

Paul Mackerras d0f319290f Restore debug access to SPRs This provides access to the SPRs via the JTAG DMI interface. For now they are still accessed as if they were GPR/FPRs using the same numbering as before (GPRs at 0 - 0x1f, SPRs at 0x20 - 0x2d, FPRs at 0x40 - 0x5f). For XER, debug reads now report the full value, not just the bits that were previously stored in the register file. The "slow" SPR mux is not used for debug reads. Decode2 determines on each cycle whether a debug SPR access will happen next cycle, based on whether there is a request and whether the current instruction accesses the SPR RAM. Signed-off-by: Paul Mackerras <paulus@ozlabs.org>		2 years ago
..
Makefile	mw_debug: Add STATIC_URJTAG flag	3 years ago
README	mw_debug: Add README	5 years ago
mw_debug.c	Restore debug access to SPRs	2 years ago

README

mw_debug is the microwatt debugger.

It can talk to the simulator using a socket.

On an Arty board it uses the FTDI device via liburjtag.

## Building on Fedora

```
dnf install urjtag-devel
make
```

If you commonly use it against one target, create an alias as follows:
```
alias mw="$HOME/microwatt/scripts/mw_debug/mw_debug -b jtag"
$ mw gpr 0 10
Connected to libftdi driver.
Found device ID: 0x0362d093
r0:	0000000000001094
r1:	0000000000001ed0
r2:	000000000000a000
r3:	0000000000000003
r4:	000000000000000d
r5:	00000000ffff2ca5
r6:	00000000ffff3eb8
r7:	0000000000000000
r8:	00000000ffff3c33
r9:	0000000000000003
Core: running
 NIA: 00000000000011d4
 MSR: 8000000000000001
```

## Building on Debian

Debian disables the library in the urjtag package. Instead, build against
local urjtag:

```
sudo apt install libftdi-dev
git clone https://git.code.sf.net/p/urjtag/git urjtag
cd urjtag/urjtag
./autogen.sh
make
```

And then uncomment the following line in Makefile to build against that copy

```
CFLAGS +=  -I urjtag/urjtag/include/ -L urjtag/urjtag/src/.libs/
```

To run:
```
alias mw="LD_LIBRARY_PATH=$HOME/microwatt/scripts/mw_debug/urjtag/urjtag/src/.libs/ $HOME/microwatt/scripts/mw_debug/mw_debug -b jtag"
$ mw
Connected to libftdi driver.
Found device ID: 0x0362d093
Core: running
 NIA: 00000000000011b8
 MSR: 8000000000000001
```