diff options
Diffstat (limited to 'common')
| -rw-r--r-- | common/board_f.c | 83 |
1 files changed, 81 insertions, 2 deletions
diff --git a/common/board_f.c b/common/board_f.c index 1721eed..29b49c3 100644 --- a/common/board_f.c +++ b/common/board_f.c @@ -57,6 +57,10 @@ #include <asm/mp.h> #endif #include <asm/sections.h> +#ifdef CONFIG_X86 +#include <asm/init_helpers.h> +#include <asm/relocate.h> +#endif #include <linux/compiler.h> /* @@ -423,7 +427,7 @@ static int reserve_lcd(void) #endif /* CONFIG_LCD */ #if defined(CONFIG_VIDEO) && (!defined(CONFIG_PPC) || defined(CONFIG_8xx)) \ - && !defined(CONFIG_ARM) + && !defined(CONFIG_ARM) && !defined(CONFIG_X86) static int reserve_video(void) { /* reserve memory for video display (always full pages) */ @@ -716,7 +720,25 @@ static int setup_reloc(void) static int jump_to_copy(void) { + /* + * x86 is special, but in a nice way. It uses a trampoline which + * enables the dcache if possible. + * + * For now, other archs use relocate_code(), which is implemented + * similarly for all archs. When we do generic relocation, hopefully + * we can make all archs enable the dcache prior to relocation. + */ +#ifdef CONFIG_X86 + /* + * SDRAM and console are now initialised. The final stack can now + * be setup in SDRAM. Code execution will continue in Flash, but + * with the stack in SDRAM and Global Data in temporary memory + * (CPU cache) + */ + board_init_f_r_trampoline(gd->start_addr_sp); +#else relocate_code(gd->dest_addr_sp, gd->new_gd, gd->dest_addr); +#endif return 0; } @@ -743,6 +765,12 @@ static init_fnc_t init_sequence_f[] = { probecpu, #endif arch_cpu_init, /* basic arch cpu dependent setup */ +#ifdef CONFIG_X86 + cpu_init_f, /* TODO(sjg@chromium.org): remove */ +# ifdef CONFIG_OF_CONTROL + find_fdt, /* TODO(sjg@chromium.org): remove */ +# endif +#endif mark_bootstage, #ifdef CONFIG_OF_CONTROL fdtdec_check_fdt, @@ -791,6 +819,9 @@ static init_fnc_t init_sequence_f[] = { init_baud_rate, /* initialze baudrate settings */ serial_init, /* serial communications setup */ console_init_f, /* stage 1 init of console */ +#if defined(CONFIG_X86) && defined(CONFIG_OF_CONTROL) + prepare_fdt, /* TODO(sjg@chromium.org): remove */ +#endif display_options, /* say that we are here */ display_text_info, /* show debugging info if required */ #if defined(CONFIG_8260) @@ -828,6 +859,8 @@ static init_fnc_t init_sequence_f[] = { #endif #ifdef CONFIG_X86 dram_init_f, /* configure available RAM banks */ + /* x86 would prefer that this happens after relocation */ + dram_init, #endif announce_dram_init, /* TODO: unify all these dram functions? */ @@ -879,7 +912,7 @@ static init_fnc_t init_sequence_f[] = { #endif /* TODO: Why the dependency on CONFIG_8xx? */ #if defined(CONFIG_VIDEO) && (!defined(CONFIG_PPC) || defined(CONFIG_8xx)) \ - && !defined(CONFIG_ARM) + && !defined(CONFIG_ARM) && !defined(CONFIG_X86) reserve_video, #endif reserve_uboot, @@ -914,9 +947,11 @@ static init_fnc_t init_sequence_f[] = { void board_init_f(ulong boot_flags) { +#ifndef CONFIG_X86 gd_t data; gd = &data; +#endif gd->flags = boot_flags; @@ -929,6 +964,50 @@ void board_init_f(ulong boot_flags) #endif } +#ifdef CONFIG_X86 +/* + * For now this code is only used on x86. + * + * init_sequence_f_r is the list of init functions which are run when + * U-Boot is executing from Flash with a semi-limited 'C' environment. + * The following limitations must be considered when implementing an + * '_f_r' function: + * - 'static' variables are read-only + * - Global Data (gd->xxx) is read/write + * + * The '_f_r' sequence must, as a minimum, copy U-Boot to RAM (if + * supported). It _should_, if possible, copy global data to RAM and + * initialise the CPU caches (to speed up the relocation process) + * + * NOTE: At present only x86 uses this route, but it is intended that + * all archs will move to this when generic relocation is implemented. + */ +static init_fnc_t init_sequence_f_r[] = { + init_cache_f_r, + copy_uboot_to_ram, + clear_bss, + do_elf_reloc_fixups, + + NULL, +}; + +void board_init_f_r(void) +{ + if (initcall_run_list(init_sequence_f_r)) + hang(); + + /* + * U-Boot has been copied into SDRAM, the BSS has been cleared etc. + * Transfer execution from Flash to RAM by calculating the address + * of the in-RAM copy of board_init_r() and calling it + */ + (board_init_r + gd->reloc_off)(gd, gd->relocaddr); + + /* NOTREACHED - board_init_r() does not return */ + hang(); +} +#endif /* CONFIG_X86 */ + void hang(void) { puts("### ERROR ### Please RESET the board ###\n"); |