Subversion Repositories openrisc_2011-10-31

This is the Or1k specific README file for the RTEMS project.

Please send questions or comments to Chris Ziomkowski,

chris@asics.ws. I will try my best to answer your questions.

Currently, there is only 1 board support package for Or1k, which

is called bender. To make this package, it may be necessary to

edit the board configuration make file in rtems-4.5.0/make/custom.

The file is called bender.cfg. It was necessary to hard code some

libraries in this file, as I could not figure out how to make the

automatic scripts link against the correct libraries. There is a

hardcoded path to your gcclib directory which it may be necessary

to change.

Configure is excluded from CVS depository. In order to build or

rebuild it you will need:

  autoconf v2.12 or later

  automake v1.4 or later

To build configure run bootstrap script in top rtems directory by

typing

./bootstrap

If you wish to rebuild existing configure scripts type

./bootstrap -c

./bootstrap

Then create an or1k directory under the main rtems directory,

cd into this directory, and type

../configure  --target=or1k --program-prefix=

Where "" represents the prefix you have assigned

to your or1k tools. For example, mine reads:

../configure  --target=or1k --program-prefix=or32-rtems-

This should setup the makefiles necessary to create the package.

You can now simply type "make", which should build the bender support

package and the example tests.

If you don't happen to have a board available for this CPU, you

can run this against the architectural or1k simulator. There are

several ways to do this. The one which I have found most helpful

for debugging is to use it in gdb mode.

First, you'll need a console. The or1k simulator is currently

configured to open a serial port on /tmp/uart0.rx and /tmp/uart0.tx.

To use this as a normal console, you'll need to make these into

FIFOs. Do this by running the command:

mkfifo /tmp/uart0.tx

mkfifo /tmp/uart0.rx

You can now create an input and an output stream which you can see

by opening 2 windows. In the first window, type:

cat > /tmp/uart0.rx

In the other window, type:

cat < /tmp/uart0.tx

The "rx" window is where you will type, and the "tx" window will

print messages.

Next, start up the simulator by typing "sim -srv 7777". This assumes

or1ksim is in your path and that you want to start the gdb server on

port 7777.

You are now ready to load the code and run. To do this, type:

cd rtems-4.5.0/or1k

gdb bender/samples/hello.exe

Again, substitute your actual prefix for "". In my

case, this is "or32-rtems-". A log of this session is shown below. A

breakpoint has been placed on the exit function so that you can see

the exit code. Note that if you don't do this, there is no way to

automatically stop the process. It will simply appear to hang, and

gdb will never return.

flex% or32-rtems-gdb bender/samples/hello.exe

GNU gdb 5.0

Copyright 2000 Free Software Foundation, Inc.

GDB is free software, covered by the GNU General Public License, and you are

welcome to change it and/or distribute copies of it under certain conditions.

Type "show copying" to see the conditions.

There is absolutely no warranty for GDB.  Type "show warranty" for details.

This GDB was configured as "--host=i686-pc-linux-gnu --target=or32-rtems"...

(gdb) target jtag jtag://localhost:7777

Remote or1k debugging using jtag://localhost:7777

0x0 in text_start ()

(gdb) load bender/samples/hello.exe

Loading section .text, size 0x30130 lma 0x0

Loading section .data, size 0x1cc4 lma 0x30130

Start address 0x2000 , load size 204276

Transfer rate: 1634208 bits/sec, 510 bytes/write.

(gdb) b exit

Breakpoint 1 at 0x24444: file exit.c, line 65.

(gdb) run

Starting program: /home/opencores/2008/rtems-4.5.0/or1k/bender/samples/hello.exe

Breakpoint 1, exit (code=0) at exit.c:65

65      exit.c: No such file or directory.

(or1k) quit

flex%

On your "tx" window, you should see the following message:

----

*** HELLO WORLD TEST ***

Hello World

*** END OF HELLO WORLD TEST ***

----

Congratulations! You have just run a program under RTEMS on

the Or1k simulator! You can now write your own RTEMS code and

run it in the same way.

If you want, you can follow the same procedure to run the

regression test. This is found in the directory

or1k/bender/tests/base_sp.exe. Use the above instructions,

and replace bender/tests/base_sp.exe everywhere you see

bender/samples/hello.exe. It will test a large portion

of the RTEMS functionality. You should see the following

after executing this:

----

*** SAMPLE SINGLE PROCESSOR APPLICATION ***

Creating and starting an application task

Application task was invoked with argument (0) and has id of 0x8010002

*** END OF SAMPLE SINGLE PROCESSOR APPLICATION ***

---

You should now have a good idea of how to run executables. It's

now up to you to start having fun with RTEMS. Good luck....

Chris Ziomkowski

chris@asics.ws