# create a dummy usb image of size 16 MB on the host machine using fallocate or qemu-img(availble in the qemu build directory if QEMU was built from source):
fallocate -l 16M versal_usb.img
# qemu-img create versal_usb.img 16M
mkfs -t ext4 versal_usb.img
 
# Boot QEMU using petalinux commands:
petalinux-boot --qemu --prebuilt 3
 
# Login to prompt using:
username: root
password: root
 
# Enter QEMU monitor by using:
Ctrl+A + c.
# In monitor add following command to attach the driver:
drive_add 0 if=none,file=versal_usb.img,id=stick
 
# You should 'OK' being printed on screen for sucessfull drive add.
 
# To attach the USB device:
device_add usb-storage,bus=usb2@USB2_0_XHCI.0,port=1,id=usb_dev1,drive=stick

# Optional: Enter below command to see usb attached with QEMU or not:
info usb
# It should print this: Device 0.0, Port 1, Speed 5000 Mb/s, Product QEMU USB MSD, ID: usb_dev1

# to find the mount path for usb, enter command:
df -h

# Above command should print something like this:
#/dev/sda                 14.5M    140.0K     13.2M   1% /run/media/sda

# Add a text file to mounted path using:
echo "Hello from QEMU" >/run/media/sda/test.txt

# Sync using:
sync
 
# Exit the QEMU using:
Ctrl + A + x
 
# On your host machine, create a directory:
mkdir test_mount
 
# On your host machine, mount the usb.img to this path using:
sudo mount versal_usb.img test_mount/
 
# On your host machine, check the text we added in this image:
cat test_mount/test.txt

# create a dummy usb image of size 16 M on the host machine using fallocate or qemu-img(availble in the qemu build directory if QEMU was built from source):
fallocate -l 16M zynqmp_usb.img
# qemu-img create zynqmp_usb.img 16M
mkfs -t ext4 zynqmp_usb.img
 
# Boot QEMU using petalinux or any other way. Example for Petalinux:
petalinux-boot --qemu --prebuilt 3
 
# Login to prompt using:
username: root
password: root
 
# Enter QEMU monitor by using:
Ctrl+A + c.
# In monitor add following command to attach the driver. Please add correct path for zynqmp_usb.img:
drive_add 0 if=none,file=zynqmp_usb.img,id=stick
 
# You should 'OK' being printed on screen for sucessfull drive add.
 
# To attach the USB device:
device_add usb-storage,bus=usb3@0xFE200000.0,port=1,id=usb_dev1,drive=stick

# Optional: Enter below command to see usb attached with QEMU or not:
info usb
# Above should print: Device 0.1, Port 1, Speed 5000 Mb/s, Product QEMU USB MSD, ID: usb_dev1
 
#Exit monitor mode by using:
Ctrl + A + c
 
# to find the mount path for usb, enter command:
df -h

# Above command should print something like this:
# /dev/sda                 14.5M    140.0K     13.2M   1% /run/media/sda

# Add a text file to mounted path using:
echo "Hello from QEMU" >/run/media/sda/test.txt

# Sync using:
sync
 
# Exit the QEMU using:
Ctrl + A + x
 
# On your host machine, create a directory:
mkdir test_mount
 
# On your host machine, mount the usb.img to this path using:
sudo mount zynqmp_usb.img test_mount/
 
# On your host machine, check the text we added in this image:
cat test_mount/test.txt
 
# It should print the following:
Hello from QEMU