Change in ...coreboot[master]: mb/emulation/qemu-q35: Add x86_64 support

[Paul Menzel (Code Review)]

Paul Menzel has uploaded a new patch set (#24) to the change originally created by Patrick Rudolph. ( https://review.coreboot.org/c/coreboot/+/29667 )

Change subject: mb/emulation/qemu-q35: Add x86_64 support
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mb/emulation/qemu-q35: Add x86_64 support

* Enable optional x86_64 romstage, postcar and ramstage
* Add Kconfig for x86_64 compilation
* Add documentation for x86 qemu mainboards
* Increase CAR stack as x86_64 uses more than 0x4000 bytes
* Always setup MTRRs even though qemu doesn't care about them

Working:
* Boots to Linux
* Boots to SeaBios
* Drops to protected mode at end of ramstage
* Enumerates PCI devices
* Relocateable ramstage

Broken:
* Entering SMM due to missing long mode setup

Signed-off-by: Patrick Rudolph 
Change-Id: If2f02a95b2f91ab51043d4e81054354f4a6eb5d5
---
M Documentation/arch/x86/index.md
A Documentation/mainboard/emulation/qemu-i440fx.md
A Documentation/mainboard/emulation/qemu-q35.md
M Documentation/mainboard/index.md
M src/arch/x86/Kconfig
M src/cpu/qemu-x86/Kconfig
M src/cpu/qemu-x86/Makefile.inc
M src/mainboard/emulation/qemu-i440fx/Kconfig
M src/mainboard/emulation/qemu-i440fx/romstage.c
M src/mainboard/emulation/qemu-q35/Kconfig
M src/mainboard/emulation/qemu-q35/romstage.c
11 files changed, 266 insertions(+), 19 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/67/29667/24