Per Intel FSP architecture specification, FSP provides 3 routines for bootloader to call. The first one is the TempRamInit (aka Cache-As-Ram initialization) and the second one is the FspInit which does the memory bring up (like MRC for other x86 targets) and chipset initialization. Those two routines have to be called before U-Boot jumping to board_init_f in start.S.
The FspInit() will return several memory blocks called Hand Off Blocks (HOBs) whose format is described in Platform Initialization (PI) specification (part of the UEFI specication) to the bootloader. Save this HOB address to the U-Boot global data for later use.
Signed-off-by: Bin Meng bmeng.cn@gmail.com Acked-by: Simon Glass sjg@chromium.org
---
Changes in v3: None Changes in v2: - Move FspInit call from start.S to car_init
arch/x86/cpu/start.S | 14 ++++++++++++++ arch/x86/include/asm/global_data.h | 3 +++ arch/x86/lib/asm-offsets.c | 3 +++ 3 files changed, 20 insertions(+)
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S index f9662fb..125782c 100644 --- a/arch/x86/cpu/start.S +++ b/arch/x86/cpu/start.S @@ -75,6 +75,7 @@ early_board_init_ret: jmp car_init .globl car_init_ret car_init_ret: +#ifndef CONFIG_HAVE_FSP /* * We now have CONFIG_SYS_CAR_SIZE bytes of Cache-As-RAM (or SRAM, * or fully initialised SDRAM - we really don't care which) @@ -95,6 +96,12 @@ car_init_ret: #ifdef CONFIG_DCACHE_RAM_MRC_VAR_SIZE subl $CONFIG_DCACHE_RAM_MRC_VAR_SIZE, %esp #endif +#else + /* + * When we get here after car_init, esp points to a temporary stack + * and esi holds the HOB list address returned by the FSP. + */ +#endif
/* Reserve space on stack for global data */ subl $GENERATED_GBL_DATA_SIZE, %esp @@ -109,6 +116,13 @@ car_init_ret: movl %esp, %edi rep stosb
+#ifdef CONFIG_HAVE_FSP + /* Store HOB list */ + movl %esp, %edx + addl $GD_HOB_LIST, %edx + movl %esi, (%edx) +#endif + /* Setup first parameter to setup_gdt, pointer to global_data */ movl %esp, %eax
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h index 48bbd1a..03d491a 100644 --- a/arch/x86/include/asm/global_data.h +++ b/arch/x86/include/asm/global_data.h @@ -47,6 +47,9 @@ struct arch_global_data { enum pei_boot_mode_t pei_boot_mode; const struct pch_gpio_map *gpio_map; /* board GPIO map */ struct memory_info meminfo; /* Memory information */ +#ifdef CONFIG_HAVE_FSP + void *hob_list; /* FSP HOB list */ +#endif };
#endif diff --git a/arch/x86/lib/asm-offsets.c b/arch/x86/lib/asm-offsets.c index 50a488f..70ccf1b 100644 --- a/arch/x86/lib/asm-offsets.c +++ b/arch/x86/lib/asm-offsets.c @@ -18,5 +18,8 @@ int main(void) { DEFINE(GD_BIST, offsetof(gd_t, arch.bist)); +#ifdef CONFIG_HAVE_FSP + DEFINE(GD_HOB_LIST, offsetof(gd_t, arch.hob_list)); +#endif return 0; }