confused on how to fill data in bram through axi_bram_controller

[dakefeng]

Made a simple zynq project, a small bram in PL and an axi bram controller connected to its port. The axi ip routed to axi interconnection without any complain. 

At SDK import a test BRAM application and it shows pass test. 

But I am still very confused how to access the data and addr in the BRAM. The AXI memory base add is 40000000 and high is 4000FFFF, does that  mean this is the memory address range I need to read and write?

Thanks,

Dake

[D@n]

It sure sounds like it would mean that.  Don't forget, though, that this is a physical memory address and not a virtual memory address.  To get access to physical memory addresses, I often find myself opening /dev/kmem.  I may even request a local map via mmap of the portion of /dev/kmem I need.

Hope this helps,

Dan

[dakefeng]

Dan, I am now starting from standalone application instead of linux application. I guess the address is not virtual one, by Xil_In32 call?

[D@n]

You are right.  I had thought you were trying to run a Linux application.  Honestly, I don't know the answer to your question.  Hopefully someone who does will pipe up.

But, while I'm here, let me make sure I understand: you say it passes a test BRAM application.  Do you have any source code or materials for that application?  Can you copy from it and learn from it that way?

Dan

[dakefeng]

Just noticed that selftest program example is for ECC only, without enable ECC like what I did, it does nothing just return successful.

[dakefeng]

Unforturnaly it doesn't work.

 

u32 addr=Bram.Config.MemBaseAddress;

int cnt=0;

while(cnt<10){

     xil_printf("At addr: %x\r\n",addr);

     XBram_Out32(addr,0x7fff);

     xil_printf("done%d\r\n",cnt);

    addr++;

    cnt++;

    usleep(100);

}

The program hangs at the second try of XBram_Out32 calling.

How can I fill the memory? Thanks a lot.

[D@n]

Ahm ... okay, it hangs at the second try?  Is this because the second access is misaligned?  You're doing a 32-bit output, yet your address is incrementing by one byte at a time, right?

Dan

[dakefeng]

you are right

[D@n]

HEY!!! I GOT ONE!!!   

Dan