Reading HPS Interrupt Controller registers

Hi DReme,

May I know more details from you?

1. Can the Jtag Master access other register without problem?

2. What GIC register that you are trying to read?

3. Are you able to write on any of the GIC register？

Thanks.

Regards,

Aik Eu

Hi DReme,

Are you reading from this address 0xFFFEC100

https://www.intel.com/content/www/us/en/programmable/hps/cyclone-v/hps.html#sfo1410068407646.html

Thanks.

Regards,

Aik Eu

Hi DReme,

I have prepared the setup and tried it on my side and see that it is returning 0 for the GIC interrupt controller address. I am consulting my team regarding this and will feedback to you again.

Thanks.

Regards,

Aik Eu

Hi DReme,

From HPS side, we can read/write the GIC interrupt register,

From FPGA side, we are not able read/write the interrupt register using Quartus system console.

We suspect that there is some secure enablement for the Cyclone V board to do that at the moment which we would like test on it further.

May I know any particular reason from your side to use Jtag master to access read/write on the GIC controller register?

Thanks.

Regards,

Aik Eu

FYI, the access of read/write to the GIC interrupt register in U-boot.

Hi DReme,

Thanks for letting me about your scenario.

I am still further querying on this issue, will let you know once I got some new findings.

Thanks.

Regards,

Aik Eu

Hi DReme,

The address from 0xffd0000 to 0xffff0000 cant be accessed from non-MPU side.

GIC registers are inside MPU registers, which could not be accessed by non-MPU master.

So I think you can check only with HPS side but not from FPGA->HPS which is using the system console through Jtag master

Thanks.

Regards,

Aik Eu

FYI, refer to the pic above. The blank area of the non-MPU as compared to the MPU shows access limitation.

Thanks.

Regards,

Aik Eu