[PATCH v4 01/27] x86: Change how selection of ROMs works

[Simon Glass]

Most x86 boards build a u-boot.rom which is programmed into SPI flash. But
this is not unique to x86. For example some rockchip boards can also boot
from SPI flash.

Also, at least on x86, binary blobs are sadly quite common. It is not
possible to build a functional image without them, and U-Boot needs to
know this at build time.

Introduce a new CONFIG_HAS_ROM option which selects whether u-boot.rom is
built and a new CONFIG_ROM_NEEDS_BLOBS option to indicate whether binary
blobs are also needed. If they are not needed, it is safe to build the ROM
always. Otherwise we still require the BUILD_ROM environment variable.

For now this affects only x86, but future patches will enable this for
rockchip too.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

(no changes since v2)

Changes in v2:
- Drop 'rockchip' tag since this commit no-longer affects rockchip yet
- Drop ROM_NEEDS_BLOBS for baytrail since HAVE_FSP already selects it

 Kconfig                    | 18 +++++++++++++++++-
 Makefile                   | 18 +++++++++++++-----
 arch/Kconfig               |  1 +
 arch/x86/Kconfig           |  4 ++++
 arch/x86/cpu/quark/Kconfig |  1 +
 5 files changed, 36 insertions(+), 6 deletions(-)

Applied to u-boot-dm, thanks!