Very confused about PRU local and global memory map

[Ventura]

I am doing some tests using PRU assembly to figure out the architecture of PRU but I am very confused about memory map explained in the manual "AM335x PRU-ICSS Reference Guide" and here are the points.

1. I am sending one char to the UART0 using the global address 0x44e0_9000 and it works fine. I am doing that using the OCP slave port.

2. I try to do the same using the local address 0x0002_8000 (table 5, page 19) without use the OCP slave but it doesn't work.

3. I don't understand based on the table 6 (Global memory map offset addresses) how to obtain the global address 0x44e0_9000.

I am supposing that there is only one UART0, the same is used by ARM and PRUs (maybe it's not true).

[Thomas Mauer]

The ICSS has it's own local UART. It is not related to UART0 of the SoC peripherals that you use in (1).

From global memory point of view:
UART0 is at 0x44e0_9000
ICSS UART is at 0x4a328_0000

-Thomas

[Jorge Ventura]

That explain everything!

Thank you.

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