Re: Sending data from host to guest on UART

[Mahmoud Shirazi]

Dear Peter, ​
Thanks for your response. The machine that I selected in Qemu is 
"xilinx-zynq-a9".  I checked again. It seems that it is corresponds to 
ZYNQ-7000 board. Am I right?

Best,
Mahmoud 

Mahmoud Shirazi, PhD
Assistant Professor, 
Department of Computer Science and Information Technology,
Institute for Advanced Studies in Basic Sciences (IASBS),
Zanjan, Iran
Tel: +98-24-33153395
http://iasbs.ac.ir/~m.shirazi


On Mon, 05/10/2021 01:22 AM, Peter Maydell <peter.maydell@linaro.org> wrote:
> 
On Fri, 7 May 2021 at 19:56, Mahmoud Shirazi " 
target="_blank"><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
> 
>