[altcycv_devkit] Access to FPGA Fabric via HPS2FPGA Bridge

[Sebastian Huber]

Hello,

On 29/03/2019 12:57, Christian Spindeldreier wrote:
> Hi,
>
> currently we experimenting with the RTEMS-5 on a Cylcone V SoC-FPGA 
> using the altcycv_devkit BSP. Now we are trying to access a simple 
> hardware module connected to the HPS2FPGA Bridge via an AXI 
> interconnect. Our approach of simply write data to the corresponding 
> address or using the 'alt_write_word()' function which basically does 
> the same, results in a system crash, so i guess we are missing something.

for this platform please use the RTEMS master and not RTEMS 4.11 or 
something like that. You should first get more information about the 
system crash. I would install a custom fatal error handler which prints 
out the termination reason, see also rtems_exception_frame_print(). With 
it you can get the exception reason and the program counter.

I guess, the MMU is not set up to allow an access to this region:

>
> *((volatile uint32_t *) 0xC0000000) = (uint32_t) 1UL;
> alt_write_word(0xC0000000, 0x01);

-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
Fax     : +49 89 189 47 41-09
E-Mail  : sebastian.huber at embedded-brains.de
PGP     : Public key available on request.

Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.