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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 DCACHE_RAM_BASE
hex
config DCACHE_RAM_SIZE
hex
config DCACHE_BSP_STACK_SIZE
hex
config EARLYRAM_BSP_STACK_SIZE
depends on RESET_VECTOR_IN_RAM
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 SSE
bool
help
Select SSE in your socket or model Kconfig if your CPU has SSE
streaming SIMD instructions.
config SSE2
bool
default n
select SSE
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
config USES_MICROCODE_HEADER_FILES
def_bool n
select SUPPORT_CPU_UCODE_IN_CBFS
help
This is selected by a board or chipset to set the default for the
microcode source choice to a list of external microcode headers
config MICROCODE_BLOB_NOT_IN_BLOB_REPO
bool
help
Selected by platforms that don't maintain microcode updates in the
blobs repo yet.
config MICROCODE_BLOB_NOT_HOOKED_UP
bool
help
Selected by platforms that haven't hooked microcode updates up yet.
config MICROCODE_BLOB_UNDISCLOSED
bool
help
Selected by work-in-progress platforms that don't have microcode
updates available yet.
config USE_CPU_MICROCODE_CBFS_BINS
bool
help
Automatically selected below to add binary microcode files
(`cpu_microcode_bins` in the makefiles) to CBFS.
choice
prompt "Include CPU microcode in CBFS" if ARCH_X86
default CPU_MICROCODE_CBFS_EXTERNAL_HEADER if USES_MICROCODE_HEADER_FILES
default CPU_MICROCODE_CBFS_NONE if MICROCODE_BLOB_NOT_IN_BLOB_REPO || \
MICROCODE_BLOB_NOT_HOOKED_UP || \
MICROCODE_BLOB_UNDISCLOSED
depends on SUPPORT_CPU_UCODE_IN_CBFS
config CPU_MICROCODE_CBFS_DEFAULT_BINS
bool "Generate from tree"
select USE_CPU_MICROCODE_CBFS_BINS
depends on !(MICROCODE_BLOB_NOT_IN_BLOB_REPO || \
MICROCODE_BLOB_NOT_HOOKED_UP || \
MICROCODE_BLOB_UNDISCLOSED)
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_BINS
bool "Include external microcode binary"
select USE_CPU_MICROCODE_CBFS_BINS
help
Select this option if you want to include external binary files
in the CPUs native format. They 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, and applicable, select "Generate from tree"
config CPU_MICROCODE_CBFS_EXTERNAL_HEADER
bool "Include external microcode header files"
help
Select this option if you want to include external c header files
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, and applicable, 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.
Microcode may be added to the ROM image at a later time with cbfstool,
if desired.
If unsure, and applicable, 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_HEADER_FILES
string "List of space separated microcode header files with the path"
depends on CPU_MICROCODE_CBFS_EXTERNAL_HEADER
help
A list of one or more microcode header files with path from the
coreboot directory. These should be separated by spaces.
config CPU_UCODE_BINARIES
string "Microcode binary path and filename"
depends on CPU_MICROCODE_CBFS_EXTERNAL_BINS
default ""
help
Some platforms have microcode in the blobs directory, and these can
be hardcoded in the makefiles. For platforms with microcode
binaries that aren't in the makefile, set this option to pull
in the microcode.
This should contain the full path of the file for one or more
microcode binary files to include, separated by spaces.
If unsure, leave this blank.
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