Re: [Xen-users] Help on passthrough serial device to BareMetal DOMU

[Sarah Newman <srn@xxxxxxxxx>]

On 7/26/19 7:27 AM, Jan Cordes wrote:
> Hello everybody,
>
> we are fairly new to XEN and have a few questions regarding our XEN
> setup on Xilinx ZCU102 Board. We want to pass through the UART1 device
> to a bare metal guest. The way Xilinx proposed in their documentation to
> XEN BareMetal Guests is to add the following via an .dtsi file to the
> device tree:
>
> &&uart1 {
>     xen,passthrough = <0x1>;
> };
>
>
> Unfortunately, this does not work for us, we don't get any output on our
> serial console.
>
> We are using the config file which was provided by xilinx:
>
>
> #Guest name
>    name = "hello_world"
> # Kernel image to boot
>    kernel = "xapp_hello_world_el1.bin"
> # Kernel command line options - Allocate 8MB
>    memory = 8
> # Number of VCPUS
>    vcpus = 1
> # Pin to CPU 0
>    cpus = [1]
>    irqs = [ 54 ]
>    iomem = [ "0xff010,1" ]
>
> Maybe someone can give a few tips, which steps are necessary to pass a
> device to a bare metal DOMU, or point out where we missed something.
I'm not sure, but if I had this problem myself I would investigate whether Xen might be treating the serial port differently since Xen has a serial 
console. You could test syntax with a different device Xen doesn't have drivers for, or try changing the serial settings in the Xen boot arguments.
--Sarah

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