diff options
| author | Simon Glass <sjg@chromium.org> | 2017-01-16 07:03:44 -0700 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2017-02-06 11:38:46 +0800 |
| commit | 13f1dc64fd09d2894d13ca0db08ddd168bc12387 (patch) | |
| tree | f249ea504d30810dd92b8316ee76f77477bffe56 /arch/x86/Kconfig | |
| parent | a66ad67ff26a2c4940aa7b6ddba40cf202edf108 (diff) | |
x86: Kconfig: Add location options for 16/32-bit init
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>
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 5cd58d450b..675b56f617 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -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 |