diff options
| author | Andy Shevchenko | 2017-02-05 16:52:00 +0300 |
|---|---|---|
| committer | Bin Meng | 2017-02-07 13:36:50 +0800 |
| commit | 446d4e048ee3b00f7907e15cd02aa404cc714c77 (patch) | |
| tree | 10da5f28d6ecb28bfe90db12a73ee77f06130578 /arch | |
| parent | bda40d5634caa629720b3a47e45517b4ad07df9d (diff) | |
x86: make LOAD_FROM_32_BIT visible for platforms
This option is useful not only for development, but for the platforms
where U-Boot is run from custom ROM bootloader. For example, Intel
Edison is that board.
Make this option visible that platforms can select it if needed.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/Kconfig | 8 | ||||
| -rw-r--r-- | arch/x86/cpu/start.S | 12 |
2 files changed, 10 insertions, 10 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 675b56f617e..5f9597b230f 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -195,6 +195,14 @@ config SYS_X86_START16 depends on X86_RESET_VECTOR default 0xfffff800 +config X86_LOAD_FROM_32_BIT + bool "Boot from a 32-bit program" + help + Define this to boot U-Boot from a 32-bit program which sets + the GDT differently. This can be used to boot directly from + any stage of coreboot, for example, bypassing the normal + payload-loading feature. + config BOARD_ROMSIZE_KB_512 bool config BOARD_ROMSIZE_KB_1024 diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S index a5cba1cf2a7..8de55a0af1d 100644 --- a/arch/x86/cpu/start.S +++ b/arch/x86/cpu/start.S @@ -18,14 +18,6 @@ #include <generated/generic-asm-offsets.h> #include <generated/asm-offsets.h> -/* - * Define this to boot U-Boot from a 32-bit program which sets the GDT - * differently. This can be used to boot directly from any stage of coreboot, - * for example, bypassing the normal payload-loading feature. - * This is only useful for development. - */ -#undef LOAD_FROM_32_BIT - .section .text .code32 .globl _start @@ -76,7 +68,7 @@ _start: /* Save table pointer */ movl %ecx, %esi -#ifdef LOAD_FROM_32_BIT +#ifdef CONFIG_X86_LOAD_FROM_32_BIT lgdt gdt_ptr2 #endif @@ -233,7 +225,7 @@ multiboot_header: /* entry addr */ .long CONFIG_SYS_TEXT_BASE -#ifdef LOAD_FROM_32_BIT +#ifdef CONFIG_X86_LOAD_FROM_32_BIT /* * The following Global Descriptor Table is just enough to get us into * 'Flat Protected Mode' - It will be discarded as soon as the final |