Re: Sending data from host to guest on UART

[Peter Maydell]

On Fri, 7 May 2021 at 19:56, Mahmoud Shirazi <m.shirazi@iasbs.ac.ir> wrote:
>
> Hi,
>
> I am trying to have a connection between the guest and host using UART. The 
> guest is uCOSIII and the host is windows 10. The connection has been 
> successfully created using COM port. However, the connection is just in one 
> direction from guest to host. More precisely, I can send a character from 
> guest to host over UART, but, the guest does not receive anything from the 
> host.
> In my implementaion in C, both send and receive are based on interrupts. But, 
> when I send a character from host to guest, the interrupt does not raise.
> I checked that the interrupt is enable. I guess this is due to Qemu 
> parameters or a Qemu bug or ... .
> The version of Qemu is 5.2 and also I test with Qemu 6. The machine in xilinx 
> zc702 A9.

There's no zc702 machine in QEMU upstream. If this is related to Xilinx's
fork, it might be better to ask Xilinx about it.

thanks
-- PMM