payloads: add iPXE 'payload' build

Hardware / Coreboot - Martin Roth [google.com] - 13 April 2016 10:45 UTC

We already have the ability to add a pxe rom to cbfs, but it needs to be configured and built separately.

This moves the existing Kconfig options for PXE from device/Kconfig and the top level Makefile.inc to payloads, and adds the option to download and build iPXE as part of the coreboot build process.

This configures the serial output of iPXE to match coreboot's serial port configuration by editing the .h files. iPXE doesn't give any real build-time method of setting these configuration options.

Change-Id: I3d77b2c6845b7f5f644440f6910c3b4533a0d415

888a98b payloads: add iPXE 'payload' build
.gitignore | 1 +
Makefile.inc | 4 ---
payloads/Makefile.inc | 3 +-
payloads/external/Makefile.inc | 28 +++++++++++++++
payloads/external/iPXE/Kconfig | 74 +++++++++++++++++++++++++++++++++++++++
payloads/external/iPXE/Makefile | 74 +++++++++++++++++++++++++++++++++++++++
src/device/Kconfig | 30 ----------------
7 files changed, 179 insertions(+), 35 deletions(-)

Upstream: review.coreboot.org

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