To install Debian Jessie on an APU1D4, it is easiest to go for a network installation. You need
– a TFTP server
– a DHCP server
– the Debian file structure in the TFTP server’s root directory

For DHCP you will need something like the following configuration:

ddns-update-style none;
max-lease-time 186400;
authoritative;

subnet 192.168.66.0 netmask 255.255.255.0 {
  range 192.168.66.100 192.168.66.150;
  option domain-name-servers 192.168.66.1;
  option domain-name "example.com";
  option domain-search "example.com";
  option routers 192.168.66.1;
  option broadcast-address 192.168.66.255;
  default-lease-time 86400;
  max-lease-time 186400;
}

host apuc{
	hardware ethernet 00:0d:b9:12:34:bc;
	fixed-address 192.168.66.66;
        filename "pxelinux.0";
        next-server 192.168.66.1;
}
host apud{
	hardware ethernet 00:0d:b9:12:34:bd;
	fixed-address 192.168.66.66;
        filename "pxelinux.0";
        next-server 192.168.66.1;
}
host apue{
	hardware ethernet 00:0d:b9:12:34:be;
	fixed-address 192.168.66.66;
        filename "pxelinux.0";
        next-server 192.168.66.1;
}

For the TFTP server you need something like the following configuration:

TFTP_USERNAME="tftp"
TFTP_DIRECTORY="/srv/tftp"
TFTP_ADDRESS="0.0.0.0:69"
TFTP_OPTIONS="--secure"

Then simply extract the debian installer files into /src/tftp . I have included my working configuration into netboot_serial_20150107.tar. Should you want to change its configuration, simply edit the file pxelinux.cfg/default file. Mine looks as follows and is preconfigured for serial console output:

default install
label install
	menu label ^Install
	menu default
	kernel debian-installer/amd64/linux
	append initrd=debian-installer/amd64/initrd.gz --- vga=normal console=tty0 console=ttyS0,115200n8

Attach a serial console cable and fire it up!