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# Warning: This file is included whether or not the if is here.
# The if controls how the evaluation occurs.
# (See also src/Kconfig)
source "src/cpu/*/Kconfig"
if ARCH_X86
config CACHE_AS_RAM
bool
default !ROMCC
config DCACHE_RAM_BASE
hex
config DCACHE_RAM_SIZE
hex
config DCACHE_BSP_STACK_SIZE
hex
config DCACHE_AP_STACK_SIZE
hex
config SMP
bool
default y if MAX_CPUS != 1
default n
help
This option is used to enable certain functions to make coreboot
work correctly on symmetric multi processor (SMP) systems.
config AP_SIPI_VECTOR
hex
default 0xfffff000
help
This must equal address of ap_sipi_vector from bootblock build.
config MMX
bool
help
Select MMX in your socket or model Kconfig if your CPU has MMX
streaming SIMD instructions. ROMCC can build more efficient
code if it can spill to MMX registers.
config SSE
bool
help
Select SSE in your socket or model Kconfig if your CPU has SSE
streaming SIMD instructions. ROMCC can build more efficient
code if it can spill to SSE (aka XMM) registers.
config SSE2
bool
default n
help
Select SSE2 in your socket or model Kconfig if your CPU has SSE2
streaming SIMD instructions. Some parts of coreboot can be built
with more efficient code if SSE2 instructions are available.
endif # ARCH_X86
config SUPPORT_CPU_UCODE_IN_CBFS
bool
default n
# This variable is used to determine if we add CPU microcode to CBFS during the
# build. Microcode can be added manually afterwards, or removed. As a result,
# code should not rely on this to tell if a microcode update is present or not,
# and should instead search CBFS.
# This variable is useful in determining if certain automated post-processing
# steps can be performed right after the build, such as automatically adding
# a firmware interface table.
config CPU_MICROCODE_ADDED_DURING_BUILD
bool
default y if CPU_MICROCODE_CBFS_GENERATE || CPU_MICROCODE_CBFS_EXTERNAL
choice
prompt "Include CPU microcode in CBFS" if ARCH_X86
default CPU_MICROCODE_CBFS_GENERATE if SUPPORT_CPU_UCODE_IN_CBFS && USE_BLOBS
default CPU_MICROCODE_CBFS_NONE if !SUPPORT_CPU_UCODE_IN_CBFS
config CPU_MICROCODE_CBFS_GENERATE
bool "Generate from tree"
help
Select this option if you want microcode updates to be assembled when
building coreboot and included in the final image as a separate CBFS
file. Microcode will not be hard-coded into ramstage.
The microcode file may be removed from the ROM image at a later
time with cbfstool, if desired.
If unsure, select this option.
config CPU_MICROCODE_CBFS_EXTERNAL
bool "Include external microcode file"
help
Select this option if you want to include an external file containing
the CPU microcode. This will be included as a separate file in CBFS.
A word of caution: only select this option if you are sure the
microcode that you have is newer than the microcode shipping with
coreboot.
The microcode file may be removed from the ROM image at a later
time with cbfstool, if desired.
If unsure, select "Generate from tree"
config CPU_MICROCODE_CBFS_NONE
bool "Do not include microcode updates"
help
Select this option if you do not want CPU microcode included in CBFS.
Note that for some CPUs, the microcode is hard-coded into the source
tree and is not loaded from CBFS. In this case, microcode will still
be updated. There is a push to move all microcode to CBFS, but this
change is not implemented for all CPUs.
This option currently applies to:
- Intel SandyBridge/IvyBridge
- VIA Nano
Microcode may be added to the ROM image at a later time with cbfstool,
if desired.
If unsure, select "Generate from tree"
The GOOD:
Microcode updates intend to solve issues that have been discovered
after CPU production. The expected effect is that systems work as
intended with the updated microcode, but we have also seen cases where
issues were solved by not applying microcode updates.
The BAD:
Note that some operating system include these same microcode patches,
so you may need to also disable microcode updates in your operating
system for this option to have an effect.
The UGLY:
A word of CAUTION: some CPUs depend on microcode updates to function
correctly. Not updating the microcode may leave the CPU operating at
less than optimal performance, or may cause outright hangups.
There are CPUs where coreboot cannot properly initialize the CPU
without microcode updates
For example, if running with the factory microcode, some Intel
SandyBridge CPUs may hang when enabling CAR, or some VIA Nano CPUs
will hang when changing the frequency.
Make sure you have a way of flashing the ROM externally before
selecting this option.
endchoice
config CPU_MICROCODE_FILE
string "Path and filename of CPU microcode"
depends on CPU_MICROCODE_CBFS_EXTERNAL
default "cpu_microcode.bin"
help
The path and filename of the file containing the CPU microcode.
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