Memory read error at 0xF8000008: Cannot read write-only register

[doner_t]

Hello, 

I am using Zynq-7000, 

• I can program the Zynq- boot flash memory succesfully,
• Zynq is seen properly boot-up from flash. Done led lights up
• I can even communicate with Zynq via Ethernet for near 10 seconds. 
• After this 10 seconds later, something has gone wrong and ethernet connection is gone, even processor is seen halted.
• I tried many times, behaivor of Zynq is like that. 
• Then, I decided to try to debug a basic memory test generated by SDK. Ups. I received error  "Memory read error at 0xF8000008: Cannot read write-only register" . I can not even debug the ARM.
• I have looked at Zynq register 0xF8000008 that is seen write-only as attached from TRM. 
• Why does Zynq try to read this write-only register 0xF8000008 ? 
• May not the PS initialization be done properly after the power-on? 

Waiting for replies, 

Thank you !

[sadanan · Accepted solution]

Hi,

Which version of SDK are you using. From 2016.x, hw_server throws an error if an attempt is made to read WO regs (ps_init.tcl uses mask_write command to write to WO registers too). SDK should catch this error and throw a warning.

A simple workaround is to start hw_server manually, connect to it from xsdb/xsct, and run the command 'configparams force-mem-accesses 1'. This will suppress the memory access protection, so when you launch debug from SDK after this, you shouldn't see the error you mentioned

[doner_t]

Dear @sadanan,

*Which version of SDK are you using.

It is 2016.3

I wil try your suggestions to overcome the problem. 

Thank you.