Hi Tony

Is or1k/trunk/orp/orp_soc/sim/bin/run_rtl_regression what you are looking for?

The scripts for ORPSoCv2 are much better shaken down and work with Icarus Verilog as well, so you may be better looking there. Try openrisc/trunk/orpsocv2/sim/run. That has a Makefile to run the simulations.

Hi System2

You might want to consider stripping down the ORPSoCv2 or minsoc to remove peripherals from the bus, so you are left with just OR1200 and the memory subsystem. That will give you a faster model (less to simulate, particularly when using Verilator).

I used to do this with the old ORPSoC, and could run good software demos on my laptop. You may want to consider putting in very simple Verilog memory models for added performance. I haven't tried it with OPRSoCv2 or minsoc, but the approach should be the same.

As John Eaton points out, you'll need a bootloader at the reset vector (0x100). For the simplest programs, just set up the stack and frame pointers to a suitable location in memory (clear of the code) and then jump to _main (the address of the main () program in your C). For example here's what I use:

	.file   "start.s"

	.text
	.org	0x100		# The reset routine goes at 0x100

	.global _start
_start:
	l.addi	r1,r0,0x7f00	# Set SP to value 0x7f00
	l.addi	r2,r1,0x0	# FP and SP are the same
	l.mfspr	r3,r0,17	# Get SR value
	l.ori	r3,r3,0x2	# Set TT exception enable bit
	l.jal   _main		# Jump to main routine
	l.mtspr	r0,r3,17	# Enable exceptions (DELAY SLOT)

	.org	0xFFC
	l.nop			# Guarantee the exception vector space
				# does not have general purpose code

You'll be best linking your code without libraries or startup. Specify that the code should be placed at location 0x0 and ensure the boot code is first on the command line. For example if the above boot code is in start.o and the main program in wibble.o (compiled from wibble.c), then link the program with.

or32-elf-ld -nostartfiles -nodefaultlibs -nostdlib -Ttext 0x0 start.o wibble.o -o wibble

This can then be loaded as your program image - for example using GDB.

You'll need more subtlety with your bootloader if you want to load programs linked with the full GCC library (so you can use C library functions), and then you'll need to think how those functions are supported. Julius Baxter has put some suggestions for using newlib for this purpose on the ORPSoC webpages.

HTH

Jeremy

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