booting ipxe from pxelinux

[jwm77]

Replying to MultimediaMan:
Using APPEND does not solve the problem. (As ipxe.lkrn will not get booted at all, the append statement is not relevant.)
Embedding works fine, but is cumbersome to administrate. That's why I try to avoid it.

Replying to robinsmidsrod:
Other bzImage images work fine. Using ipxe.pxe requires embedding. See above.

There are indications that syslinux causes the problems.
Did anybody try to prove my test results? As there are no special preconditions it's quite easy to do so.