Cannot boot vmlinuz in efi

[silver310]

OK so I've been trying to use syslinux to boot this image, but can't get ipxe to chain.
In legacy mode it works fine with the following menu entry:
set pxelinux ${tftp-server}/pxelinux/legacy
set 210:string /pxelinux/legacy
set 209:string /pxelinux.cfg/test
chain ${pxelinux}/pxelinux.0 || goto testing-legacy

pxelinux loads the config file without issues (haven't tried to boot anything, but for me if the config file is loaded then it's ok, legacy isn't an issue for ipxe anyway)
But in EFI mode using the exact menu entry
set pxelinux ${tftp-server}/pxelinux/efi
set 210:string /pxelinux/efi
set 209:string /pxelinux.cfg/test
chain ${pxelinux}/pxelinux.efi || goto testing-legacy

ipxe loaded the files, but when it tries to boot I get the following error
"Getting cached packed
my IP is x.x.x.x
could not boot: Error 0x7f048281 (http://ipxe.org/7f048281)"

What am I doing wrong?