[yocto] QEMU with host USB serial

[colin.helliwell at ln-systems.com]

I'm investigating using qemu to give us some test capability, for which we
need to use the host's serial devices.

I have a qemu build which boots up fine; I'm trying to give it access to the
host USB. To keep it simple(r), I've seen mention of FTDI's device
(0403:6001) in the qemu source so that's what I've plugged in. I've done a
'chmod me:me' on the relevant /dev/bus/usb/xxx/yyy node.

 

I can't though figure out what options I should be passing to runqemu to
hook this in. I daresay I may need bootparams too, but am first just trying
to get past 'qemuparams'.

As a starting point, I'm trying things like

    runqemu qemux86-64 nographic qemuparams="-usbdevice serial"

 

which reports

 

Continuing with the following parameters:

KERNEL:
[/home/colin/100051-karo/fsl-community-bsp/buildq/tmp/deploy/images/qemux86-
64/bzImage-qemux86-64.bin]

ROOTFS:
[/home/colin/100051-karo/fsl-community-bsp/buildq/tmp/deploy/images/qemux86-
64/core-image-qemu-qemux86-64-20170124145819.rootfs.ext4]

FSTYPE: [ext4]

Setting up tap interface under sudo

Acquiring lockfile for tap0...

-net nic,model=virtio -net tap,vlan=0,ifname=tap0,script=no,downscript=no
-cpu core2duo -drive
file=/home/colin/100051-karo/fsl-community-bsp/buildq/tmp/deploy/images/qemu
x86-64/core-image-qemu-qemux86-64-20170124145819.rootfs.ext4,if=virtio,forma
t=raw -show-cursor -usb -usbdevice wacom-tablet -vga vmware   -nographic
-usbdevice serial -m 256

Running qemu-system-x86_64...

/home/colin/100051-karo/fsl-community-bsp/buildq/tmp/sysroots/x86_64-linux/u
sr/bin/qemu-system-x86_64 -kernel
/home/colin/100051-karo/fsl-community-bsp/buildq/tmp/deploy/images/qemux86-6
4/bzImage-qemux86-64.bin -net nic,model=virtio -net
tap,vlan=0,ifname=tap0,script=no,downscript=no -cpu core2duo -drive
file=/home/colin/100051-karo/fsl-community-bsp/buildq/tmp/deploy/images/qemu
x86-64/core-image-qemu-qemux86-64-20170124145819.rootfs.ext4,if=virtio,forma
t=raw -show-cursor -usb -usbdevice wacom-tablet -vga vmware -no-reboot
-nographic -usbdevice serial -m 256 -serial mon:stdio -serial null --append
"vga=0 uvesafb.mode_option=640x480-32 root=/dev/vda rw mem=256M
ip=192.168.7.2::192.168.7.1:255.255.255.0 oprofile.timer=1 rootfstype=ext4
console=ttyS0"

qemu-system-x86_64: -usbdevice serial: character device specification needed

qemu-system-x86_64: -usbdevice serial: Failed to create USB device
'usb-serial'

qemu: could not add USB device 'serial'

Set 'tap0' nonpersistent

Releasing lockfile of preconfigured tap device 'tap0'

 

Or

   runqemu qemux86-64 nographic qemuparams="-device
usb-serial,vendorid=0403,productid=6001"

 

which reports

 

Please use simplified serial or kvm options instead

Continuing with the following parameters:

KERNEL:
[/home/colin/100051-karo/fsl-community-bsp/buildq/tmp/deploy/images/qemux86-
64/bzImage-qemux86-64.bin]

ROOTFS:
[/home/colin/100051-karo/fsl-community-bsp/buildq/tmp/deploy/images/qemux86-
64/core-image-qemu-qemux86-64-20170124145819.rootfs.ext4]

FSTYPE: [ext4]

Setting up tap interface under sudo

Acquiring lockfile for tap0...

-net nic,model=virtio -net tap,vlan=0,ifname=tap0,script=no,downscript=no
-cpu core2duo -drive
file=/home/colin/100051-karo/fsl-community-bsp/buildq/tmp/deploy/images/qemu
x86-64/core-image-qemu-qemux86-64-20170124145819.rootfs.ext4,if=virtio,forma
t=raw -show-cursor -usb -usbdevice wacom-tablet -vga vmware   -nographic
-device usb-serial,vendorid=0403,productid=6001 -m 256

Running qemu-system-x86_64...

/home/colin/100051-karo/fsl-community-bsp/buildq/tmp/sysroots/x86_64-linux/u
sr/bin/qemu-system-x86_64 -kernel
/home/colin/100051-karo/fsl-community-bsp/buildq/tmp/deploy/images/qemux86-6
4/bzImage-qemux86-64.bin -net nic,model=virtio -net
tap,vlan=0,ifname=tap0,script=no,downscript=no -cpu core2duo -drive
file=/home/colin/100051-karo/fsl-community-bsp/buildq/tmp/deploy/images/qemu
x86-64/core-image-qemu-qemux86-64-20170124145819.rootfs.ext4,if=virtio,forma
t=raw -show-cursor -usb -usbdevice wacom-tablet -vga vmware -no-reboot
-nographic -device usb-serial,vendorid=0403,productid=6001 -m 256 -serial
null --append "vga=0 uvesafb.mode_option=640x480-32 root=/dev/vda rw
mem=256M ip=192.168.7.2::192.168.7.1:255.255.255.0 oprofile.timer=1
rootfstype=ext4 console=ttyS0"

QEMU 2.4.0 monitor - type 'help' for more information

(qemu) usb_device_add 1 'wacom-tablet'

usb_device_add success 'wacom-tablet'

qemu-system-x86_64: -device usb-serial,vendorid=0403,productid=6001:
Property '.vendorid' not found

Set 'tap0' nonpersistent

Releasing lockfile of preconfigured tap device 'tap0'

 

 

Can someone clue me in on the correct syntax please!

Thanks

 

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