Hi Guys,
I am using Xilinx SDK 13.1 with a Digilent XUP JTAG-USB Cable to work on my Virtex-5 FX70T FPGA chip (Board: HTG-V5-PCIE2).
I am seeking your assistance in an issue that causes my PowerPC to freeze.
Eg.1 With the code below, the PowerPC freezes (When I manually stop the process to exit it, I get the dreaded "Unable to Stop PowerPC processor" error).
int main() {
init_platform();
print("Hello World\n");
cleanup_platform();
return 0;
}
Eg.2 However, with the code below the PowerPC runs properly and exits.
int main() {
init_platform();
//print("Hello World\n"); //Code runs fine when print() is commented out
cleanup_platform();
return 0;
}
Eg.3 Only with the code below, I am able to print() something on my terminal (via JTAG UART).
int main() {
//init_platform();
print("Hello World\n"); //"Hello World" gets displayed on my terminal
cleanup_platform();
return 0;
}
Eg.4 Weirdly, this code freezes the PowerPC ! Nothing is displayed on the terminal.
//Using a method to do the printing. This code is logically similar to the code above.
void test() {
print("B\n");
}
int main() {
//init_platform();
test(); //Call to the method defined above
cleanup_platform();
return 0;
}
Eg.5 But this works without freezing the PowerPC.
void test() {
//An Empty method
}
int main() {
//init_platform();
test(); //Call to the method defined above
cleanup_platform();
return 0;
}
Eg.6 And very weirdly, the PowerPC freezes again with this code ! Nothing is displayed on the screen.
int main() {
//init_platform();
print("Hello World\n");
print("A\n"); //This is an additional print() statement
cleanup_platform();
return 0;
}
Eg.7 And even more weirdly, the PowerPC works with this code ! .
int main() {
//init_platform();
print("Hello World\n");
int i = 0; //An assignment statement in between the print()-statements makes this code work!!
print("A\n"); //This is an additional print() statement
cleanup_platform();
return 0;
}
I am not sure why this is happening. What can I do to debug this problem?
By the way, briefly this is how my lscript.ld looks like:
_STACK_SIZE = DEFINED(_STACK_SIZE) ? _STACK_SIZE : 0x400;
_HEAP_SIZE = DEFINED(_HEAP_SIZE) ? _HEAP_SIZE : 0x400;
MEMORY
{
xps_bram_if_cntlr_1 : ORIGIN = 0xFFFF0000, LENGTH = 0x0000FF00
DDR2_SDRAM_MEM_BASEADDR : ORIGIN = 0x00000000, LENGTH = 0x20000000
}
I have an on-board 512MB DDR2 RAM and had allocated 64KB for the BRAM in the BSB.
For the purpose of testing, I have used "> xps_bram_if_cntlr_1" for all the sections in the lscript.
Thanks for reading my post and thanks in advance for the help Guys !
~Susanth
