[meta-xilinx] Interrupt forwarding in AMP configuration

[Mike Looijmans]

On 23-12-16 00:38, Eric Wong wrote:
> In my AMP configuration with Linux on CPU0 and an RTOS on CPU1,
> interrupts being routed to CPU1 are specified in the device tree entry
> for remoteproc:
>
> app: app at 0 {
>     compatible = "xlnx,zynq_remoteproc";
>     reg = < 0x1E000000 0x2000000 >;
>     interrupt-parent = <&ps7_scugic_0>;
>     interrupts = < 0 27 4  0 29 4  0 30 4  0 31 4  0 32 4  0 34 4  0
> 35 4  0 37 4  0 38 4  0 39 4 >;
>     firmware = "app.elf";
>     vring0 = <15>;
>     vring1 = <14>;
> } ;
>
> The "4" in the interrupts line means the interrupt is active high, and
> things seem to be working.  If I want an interrupt to be rising edge
> triggered, I change the "4" to "1", but then when that interrupt
> triggers I get "Unexpected IRQ trap at vector 00" error in Linux and
> Linux freezes.  Does anyone know what that means or how to fix that
> error?  I would think Linux wouldn't/shouldn't even be looking at the
> interrupt(s) that are routed to CPU1.  Thanks in advance.
>

The devicetree only guards that other drivers won't steal your interrupts 
away. It does not cause the remoteproc driver to activate or assign them.

Your firmware has to register and activate the interrupt by itself. If Linux 
complains about your interrupt, you probably routed it to the wrong CPU.


Kind regards,

Mike Looijmans
System Expert

TOPIC Products
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