RTEMS FPGA memory access failed

jameszxj jameszxj at gmail.com
Tue Nov 21 08:42:53 UTC 2017

Check your MMU config, uboot do not init MMU,so you can access all address.

------------------ Original ------------------
From:  "Jianxun Yan";<yanjx at jlab.org>;
Date:  Tue, Nov 21, 2017 03:23 AM
To:  "users at rtems.org"<users at rtems.org>;

Subject:  RTEMS FPGA memory access failed


I have a DE0 Nano SoC (Cyclone V) board that runs rtems 4.11. When RTEMS 
accesses the FPGA memory space (0xc0000000 - 0xfbffffff) via the 
HPS2FPGA AXI Bridge by using command - mdump, the system got reset and 
failed. The FPGA  is programmed and the HPS2FPGA AXI Bridge is working. 
The U-boot can access the FPGA memory address starting 0xc00000000. Does 
anyone knows why rtems can't access the FPGA? and how to solve it.



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