iPXE ESXi 6.0u2 on UEFI -> PSOD

[webminster]

Just tried the Update 1 version of this as a comparison, same behavior for me, it all freezes up right after the last module load (in my case, imgpayld.tgz).

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And the definite problem is using HTTP to download the modules. While it looks like it works OK, something badly goes wrong somewhere invisibly. I did the following test, starting from a DL360G9 booted into the snponly.efi command line, where I chained to an ipxe.cfg script on a Web server I could edit:

Failed:
boot http://10.10.10.16/dists/esxi/6.0/mboot.efi -c http://10.10.10.16/dists/esxi/6.0/boot.cfg ks=http://10.10.10.16/01-ec-b1-d7-77-42-90.cfg

Succeeded:
boot tftp://10.10.10.16/dists/esxi/6.0/mboot.efi -c tftp://10.10.10.16/dists/esxi/6.0/boot.cfg ks=http://10.10.10.16/01-ec-b1-d7-77-42-90.cfg

So, why would downloading the installer modules via HTTP be so much worse than pulling them via TFTP?