No disks when booting windows 7 setup (x86/x64) from an iSCSI target

[whocares0101]

I'm trying to run the windows setup from an iSCSI target, the target is a NTFS with all the files from the ISO file just like a bootable usb stick.
Booting the setup works fine (but stays very long at the "Stating Windows" screen) with virtualbox but there are no disks available to install on.

OpenWRT (DHCP) > server.lan (debian, tftp, iscsi) > iPXE (undionly.kpxe) > Windows setup

ietd.conf

Code:

Target iqn.2014-11.lan.server:windows_7_sp1_en_x86
    Lun 0 Path=/srv/iscsi/windows_7_sp1_en_x86.iscsi,Type=fileio,IOMode=ro

Target iqn.2014-11.lan.server:windows_7_sp1_en_x64
    Lun 0 Path=/srv/iscsi/windows_7_sp1_en_x64.iscsi,Type=fileio,IOMode=ro

iPXE

Code:

:w7x86
set netX/gateway ${iscsi-server}
sanhook ${iscsi-url}:iqn.2014-11.lan.server:windows_7_sp1_en_x86 || goto failed
sanboot --no-describe

:w7x64
set netX/gateway ${iscsi-server}
sanhook ${iscsi-url}:iqn.2014-11.lan.server:windows_7_sp1_en_x64 || goto failed
sanboot --no-describe

This is the error I get
http://www.mediafire.com/view/x3owbwk6q7..._disks.png

What is the right way to boot the setup from an iSCSI target?