Clean up the handling of firmware selection inside the Makefiles.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Remove several files which aren't used at all during the build.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Previous commit changed the dependency filenames to not have a leading '.'

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>

We can let compiler driver pass the right options to preprocessor after
processing -Mxy options, right now its bypassing the gcc driver and
handing them straight to cpp

This also helps in other compilers processing these options correctly
for their preprocessors consumption

Signed-off-by: Khem Raj <raj.khem@gmail.com>

This option is mandatory when compiling for EFI as some event handlers
may interupt the running code and use the space just above the reserved
stack space.

Signed-off-by: Sylvain Gault <sylvain.gault@gmail.com>

The libupload was using the pxe_call() directly for doing the tftp
uploading stuff. This was only working with pxelinux.

Since we do have lpxelinux, the libupload should use the core functions
to get rid of thoses direct PXE calls.

This patch does
 - add a tftp_put() function which supports core functions.
 - implement the call from libupload making the code much more simplier

As a result {l}pxelinux can upload data to a tftp server is a similar
way. HDT is getting the benefit of such code.

When debugging some syslinux code with debugging enabled, the threading
code is so verbose that it completly slow down syslinux but also is so
verbose that any other trace is invisible in the flood.

This commit aims at requesting people to explicitly enable the
threading logs by using -DDEBUG_THREAD.

Export the firmware type as a cpp variable so we can #ifdef.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>