Syslinux - Jun 2016 - Getting HTTP path-prefix to work with syslinux.efi

I previously wrote:
 > On a whim, I then tried "-b path-prefix" instead of "-a
path-prefix",
 > and that was the solution! Everything works!

Oops, I spoke too soon. With syslinux.efi, using "-b path-prefix 
http://my.ip.address/" merely "works" because it's the same
as not
specifying the option at all: files get transferred by TFTP.

Thus, the only way for me to get HTTP transfers would be to use "-a 
path-prefix" (which is what I do with BIOS architecture). However, in 
syslinux.efi 6.03 and 6.04pre1, with UEFI architecture, this causes 
syslinux.efi to hang (no attempt by the client to talk on the network).

Is syslinux.efi supposed to be able to handle HTTP URLs?

--Alex

On Jun 13, 2016 7:21 PM, "Alexander Perlis via Syslinux" <syslinux
at zytor.com>
wrote:
>
> I previously wrote:
> > On a whim, I then tried "-b path-prefix" instead of "-a
path-prefix",
> > and that was the solution! Everything works!
>
> Oops, I spoke too soon. With syslinux.efi, using "-b path-prefix
http://my.ip.address/" merely "works" because it's the same
as not
specifying the option at all: files get transferred by
TFTP.
>
> Thus, the only way for me to get HTTP transfers would be to use "-a
path-prefix" (which is what I do with BIOS architecture). However, in
syslinux.efi 6.03 and 6.04pre1, with UEFI architecture, this causes
syslinux.efi to hang (no attempt by the client to talk on the
network).
>
> Is syslinux.efi supposed to be able to handle HTTP URLs?
If the underlying firmware can.   Try just specifying an HTTP URL in the
config or on the command line instead of the path-prefix option.  Likely
I'd need implementation details to diagnose further

>  > Is syslinux.efi supposed to be able to handle HTTP URLs?
>
> If the underlying firmware can.   Try just specifying an HTTP URL in the
> config or on the command line instead of the path-prefix option.
Doesn't work. Apparently the Dell UEFI PXE firmware doesn't know HTTP.

Somehow I was under the impression improvements from pxelinux variants 
like lpxelinux were already wrapped into the EFI version.

Is there an "l" version of syslinux.efi? Or any way to get HTTP 
transfers with UEFI on a system whose underlying firmware doesn't 
understand HTTP?

Thanks,
Alex