On Oct 12, 2:32 am, "SJU" <sjul...@adeneo.adetelgroup.com> wrote:
> Hi all,
>
> We are building a very simple SOC ( PPC 405, internal memory, UART light)=
 in
> a V4FX60, with a very simple firmware.
> The point is that when we use the PLB_BRAM memory, the GDB debugger works
> fine, but wneh we use the OCM memories, the debugger behaves in astrange
> way. When we download the file then it goes in a assembly state and execu=
tes
> nothing, I guess it went in some exceptions or executed some unexpected
> instructions.
>
> Is there something to know to use the OCM memories ?
> Are there some configuration to make in EDK ?
>
> Thanks for your help.
>
> St=E9phane.

What you need to watch out for is how you map the memory. One of the
items we've noticed in previous builds was if the ISOCM and DSOCM were
not in seperate 24M regions, then things would act funny. Therefore,
we've mapped our ISOCM to 0xFFFFxxxx and our DSOCM to 0xFEFFxxxx. It
seems to work fine in our builds so far. I have not tried re-tuning it
yet since I haven't needed the OCM for my current system testing.
Also, if you do have the memories separated, you may need to map in
the ISOCM through the command line options of XMD: isocmStartAdr
isocmSize.

-- Mike

On Oct 12, 9:32 am, "SJU" <sjul...@adeneo.adetelgroup.com> wrote:
> Hi all,
>
> We are building a very simple SOC ( PPC 405, internal memory, UART light)=
 in
> a V4FX60, with a very simple firmware.
> The point is that when we use the PLB_BRAM memory, the GDB debugger works
> fine, but wneh we use the OCM memories, the debugger behaves in astrange
> way. When we download the file then it goes in a assembly state and execu=
tes
> nothing, I guess it went in some exceptions or executed some unexpected
> instructions.
>
> Is there something to know to use the OCM memories ?
> Are there some configuration to make in EDK ?
>
> Thanks for your help.
>
> St=E9phane.

Hello Stephane. How do you write to the OCM Bram? i am using a VHDL
file in the PORTB. probably i dont write in the correct location. But
the simulation is strange to me also. Dont forget if you are using
port B to set the clk to sys_clk_pin and the Reset to sys_bus_rst.

regards

Hi all,

We are building a very simple SOC ( PPC 405, internal memory, UART light) in 
a V4FX60, with a very simple firmware.
The point is that when we use the PLB_BRAM memory, the GDB debugger works 
fine, but wneh we use the OCM memories, the debugger behaves in astrange 
way. When we download the file then it goes in a assembly state and executes 
nothing, I guess it went in some exceptions or executed some unexpected 
instructions.

Is there something to know to use the OCM memories ?
Are there some configuration to make in EDK ?

Thanks for your help.

St�phane.