Create an appliance running OpenWRT serving gpxelinux.0
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Create an appliance running OpenWRT serving gpxelinux.0

Edit the file /etc/init.d/dnsmasq to add the right location and arguments:

start() {
  include /lib/network
  scan_interfaces
  config_load /var/state/network
  config_load dhcp
#      args=""
  args=" --enable-tftp --tftp-root=/mnt/usbdrive --dhcp-boot=/mnt/usbdrive/pxelinux.0"

Then type the following commands on the command line:

root@OpenWrt:~# uci set dhcp.dnsmasq.enable_tftp=1
root@OpenWrt:~# uci set dhcp.dnsmasq.tftp_root=/mnt/usbdrive
root@OpenWrt:~# uci set dhcp.dnsmasq.dhcp_boot=/mnt/usbdrive/pxelinux.0
root@OpenWrt:~# uci commit dhcp
root@OpenWrt:~# /etc/init.d/dnsmasq restart