Hello!
I'm trying to run QEMU-Microblaze (Little-endian) with a standalone app in some
different ways, but none of them works for me:
1) I have created my own .DTB from my system design (.HDF), just a
microblaze connected to the Uartlite AXI, leds, interrupt controller, and a
gpio. Using the board support package I've made a simple c-based program (at
the end of the message):
Run it with ./qemu-system-microblazeel -M microblaze-fdt-plnx -dtb
system-top.dtb -kernel fibonacci.elf (-s -S) #(-s -S just to debug it)
Invalid MicroBlaze version number: (null) #Don't think it's a problem
Bar ram offset 9000528f
Aborted (core dumped)
2) I use a mb.dtb that I found on the internet. Same c-based program. Run
it with the debugger:
./qemu-system-microblazeel -M microblaze-fdt-plnx -dtb mb.dtb -kernel
fibonacci.elf (-s -S)
Lets my debug it (doesn't fail booting), but in the first step:
Bad ram pointer
I suppose this isn't my option cause the .dtb is created for another
microblaze-based design.
3) I use the same design (.HDF), but run it for the Spartan 3a dsp 1800
option:
./qemu-system-microblazeel -kernel fibonacci.elf (-s -S)
Runs "properly" -> I mean properly because I can follow on the debugger that
the steps are correctly made:
_start -> _start1 -> main -> fibonacci -> xil_printf -> xil_printf ... ->
xil_printf -> _exit
But doesn't print nothing. And doesn't write in memory as asked (*addrPtr =
0x150) :
In the qemu shell:
(qemu) x 0xC0000000
C0000000: 0x00000000 #When it should be 0x00000150
4) Modifying my system design to be similar to the Spartan board design:
MEMORY_BASEADDR 0x90000000
FLASH_BASEADDR 0xa0000000
INTC_BASEADDR 0x81800000
TIMER_BASEADDR 0x83c00000
UARTLITE_BASEADDR 0x84000000
ETHLITE_BASEADDR 0x81000000
I get exactly the same result as in the (3) case.
So here they go my questions:
- Am I doing it right? Is this the method of running a standalone
program over a microblaze?
- How can I make the program print something?
- Im not sure if the problem is that it doesn't write on memory, or I
am the one who fails reading it from the shell, because if I change the writing
position to (0x84000008, uart status position) I get the error (qemu: hardware
error: write to UART STATUS?) -> that means im writing (or trying, at least).
How can I write on memory (and read after it, so I know it works)?
Thank you in advance! Really appreciate your Job! (I'm sorry if my problem it's
a simple one, I'm new at it)
#include <stdio.h>
#include "platform.h"
#include "xil_printf.h"
void fibonacci(int d){
u32 a=1;
u32 b=0;
u32 em=0;
u32 *addrPtr = 0xC0000000;
for(int num=0; num<d; num++){
for(int i=0; i<a; i++){
}
for(int c=0; c<b; c++){
}
em = a+b;
xil_printf(em);
*addrPtr = 0x150;
addrPtr+=1;
b=a;
a=em;
}
}
int main()
{
init_platform();
int i=35;
fibonacci(i);
cleanup_platform();
return 0;
}
