booting multiple nios2 from SDRAM

Altera_Forum · ‎02-02-2005

Hi

Any advice..?

I have a S260ES dev board and what I want to do is have 2 nios2's boot and run from the top 2Mbytes of the installed 16Mbytes SDRAM (located at 0x0 to 0x000FFFFF).

I have 2 cpus CPU_A and CPU_B. I have a JTAG_UART for each. I have the SDRAM interface and finally some buttons and leds for stimulus and response

for CPU_A

I set the reset address to 0x00E00000 and the exception address to 0x00E20000

and for CPU_B

I set the reset address to 0x00D00000 and the exception address to 0x00D20000

I build the system and create two simple hello world projects (that poll a button and printf hello world) each with seperate system libraries.

For both projects I set the system library .text .rodata and .rwdata options to SDRAM

stdin/out and err to the correct JTAG UART

When I run (debug) the projects seperately.. they both work fine.

But when I run them concurrently only one (the last one started) will run!

I guess im doing something obvious wrong..!?!

Cheers in advance for any help

Altera_Forum · ‎02-03-2005

kits version??

I think:

if verison is v1.0, change the tcp port in debug configuration page,so that the two projects have different tcp ports.

if verison is v1.1, create a multiprocessor collection and include the two projects.

Altera_Forum · ‎02-04-2005

Hi Cheers for the reply..

Im using 4.1 and 1.0.. I had set the tcp ports to be different..!

What I think I had done wrong was I only had one system timer and was tring to use this for

both processors.. Duh!!

(one would clear the interrupt and the other would hang waiting for it!!)

I have just got copies of 4.2 and 1.1.. im going to have a play today to see what improvements

there are w.r.t multi-proc systems

(I actually have 7 niosII's in my design so im hopping it will make things a little easier.)