[Qemu-discuss] Getting Input/output error while trying to use ttyS0 in the guest

[FRNC RAMS]

Hi,

What I’m trying to do is to establish a serial communication between the guest and host to streamg some data.

 

The command that I use to launch qemu goes as fallow:

 

sudo qemu-system-arm -M beaglexm -m 1024 -sd ./test.img -clock unix -serial stdio -device usb-mouse -device usb-kbd –serial pts

 

when qemu launches I get this message:

char device redirected to /dev/pts/1 (label serial1)

 

and then the guest boots. As this far everything is fine.

 

The problem is when I try to use on /dev/ttyS0 in the guest to start communicationg with the host I get  Input/output error.

 

On the host I use minicom and open /dev/pts/1

 

On the gest I use:

 

open tty:

stty -F /dev/ttyS0 9600 cs8 cread clocal

and it returns:

stty: /dev/ttyS0: Input/output error

 

write:

echo “test” > /dev/ttyS0

and it returns:

-bash: echo: write error: Input/output error

 

Read:

cat /dev/ttyS0

and it returns:

cat: read error: Input/output error

 

Could someone help me with this?

 

Thanks alot.

 

Francisco