2 running an application – Aero-Flex GAISLER GR-LEON4-ITX User Manual
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GR-LEON4-ITX Development Board
Quick Start Guide
Ethernet Debug Communications Link (EDCL). However any of the other debug links would
be fine. The first listing shows all cores available in the design. Giving the command info sys
prints a detailed report of the system. The output is too long to include here, however as a
sample with some most of the output cut out:
grlib> info sys
00.01:048 Gaisler Research LEON4 SPARC V8 Processor (ver 0x0)
ahb master 0
… some output removed...
02.01:01d Gaisler Research GR Ethernet MAC (ver 0x0)
ahb master 2, irq 12
apb: c0100100 – c0100200
edcl ip 192.168.0.54, buffer 2 kbyte
… some output removed...
01.01:02e Gaisler Research DDR2 Controller (ver 0x0)
ahb: 40000000 – 80000000
ahb: ffe00100 – ffe00200
32-bit DDR2 : 1 * 256 Mbyte @ 0x40000000
200 MHz, col 10, ref 7.8 us, trfc 135 ns
… some output removed...
grlib>
The above shows a sample of the cores connected. In the sample we can see that the EDCL
IP address has been set and that the EDCL has 2 kbyte hardware buffer, we can also see
that GRMON has identified, and configured the DDR2 controller to use, 256 MiB of DDR2
SDRAM memory.
4.2 Running an application
In this example we will compile and run an application of our own. The procedure for
downloading other applications is the same as shown below.
In order to cross-compile a stand-alone C application the host computer must have the BCC
toolchain installed. The toolchain can be downloaded from
and is
also included on the USB Flash stick (software/toolchains/BCC).
Below is a transcript of a terminal with comments inserted:
Show contents of file hello.c:
user@host:~$ cat hello.c
#include <stdio.h>
int main(void)
{
printf("Hello world\n");
return 0;
}
Compile and link application, place resulting machine code in file hello:
user@host:~$ sparc-elf-gcc -Wall hello.c -o hello
Connect with GRMON and load the application. Note that the flag -u is given to GRMON.
This flag places the first UART in debug mode which means that GRMON will echo the
characters written to the UART and the user does not need to attach a dedicated serial
terminal to the board. Without -u switch, no output would come from the program. Please
see the GRMON User's Manual for more information.
jan@jan:~$ grmon -eth -ip 192.168.0.54 -u
© Aeroflex Gaisler AB
June 2010, Rev. 0.2