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x86: Kconfig: Add location options for 16/32-bit init

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At present all 16/32-bit init is controlled by CONFIG_X86_RESET_VECTOR. If
this is enabled, then U-Boot is the 'first' boot loader and handles execution
from the reset vector through to U-Boot's command prompt. If it is not
enabled then U-Boot starts at the 32-bit entry and skips most of its init,
assuming that the previous boot loader has done this already.

With the move to suport 64-bit operation, we have more cases to consider.
The 16-bit and 32-bit init may be in SPL rather than in U-Boot proper.

Add Kconfig options which control the location of the 16-bit and the 32-bit
init. These are not intended to be user-setting except for experimentation.
Their values should be determined by whether 64-bit U-Boot is used.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2017-01-16 07:03:44 -07:00 • committed by Bin Meng
parent a66ad67ff2
commit 13f1dc64fd
1 changed files with 40 additions and 0 deletions
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arch/x86/Kconfig
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@ -135,6 +135,46 @@ config X86_RESET_VECTOR
bool
default n
# The following options control where the 16-bit and 32-bit init lies
# If SPL is enabled then it normally holds this init code, and U-Boot proper
# is normally a 64-bit build.
#
# The 16-bit init refers to the reset vector and the small amount of code to
# get the processor into 32-bit mode. It may be in SPL or in U-Boot proper,
# or missing altogether if U-Boot is started from EFI or coreboot.
#
# The 32-bit init refers to processor init, running binary blobs including
# FSP, setting up interrupts and anything else that needs to be done in
# 32-bit code. It is normally in the same place as 16-bit init if that is
# enabled (i.e. they are both in SPL, or both in U-Boot proper).
config X86_16BIT_INIT
bool
depends on X86_RESET_VECTOR
default y if X86_RESET_VECTOR && !SPL
help
This is enabled when 16-bit init is in U-Boot proper
config SPL_X86_16BIT_INIT
bool
depends on X86_RESET_VECTOR
default y if X86_RESET_VECTOR && SPL
help
This is enabled when 16-bit init is in SPL
config X86_32BIT_INIT
bool
depends on X86_RESET_VECTOR
default y if X86_RESET_VECTOR && !SPL
help
This is enabled when 32-bit init is in U-Boot proper
config SPL_X86_32BIT_INIT
bool
depends on X86_RESET_VECTOR
default y if X86_RESET_VECTOR && SPL
help
This is enabled when 32-bit init is in SPL
config RESET_SEG_START
hex
depends on X86_RESET_VECTOR