diff options
Diffstat (limited to 'lib_i386/board.c')
| -rw-r--r-- | lib_i386/board.c | 157 |
1 files changed, 90 insertions, 67 deletions
diff --git a/lib_i386/board.c b/lib_i386/board.c index 44fa0e3..f3b6348 100644 --- a/lib_i386/board.c +++ b/lib_i386/board.c @@ -38,6 +38,7 @@ #include <net.h> #include <ide.h> #include <asm/u-boot-i386.h> +#include <elf.h> #ifdef CONFIG_BITBANGMII #include <miiphy.h> @@ -45,41 +46,16 @@ DECLARE_GLOBAL_DATA_PTR; -extern long _i386boot_start; -extern long _i386boot_end; -extern long _i386boot_romdata_start; -extern long _i386boot_romdata_dest; -extern long _i386boot_romdata_size; -extern long _i386boot_bss_start; -extern long _i386boot_bss_size; - -/* The symbols defined by the linker script becomes pointers - * which is somewhat inconveient ... */ -ulong i386boot_start = (ulong)&_i386boot_start; /* code start (in flash) defined in start.S */ -ulong i386boot_end = (ulong)&_i386boot_end; /* code end (in flash) */ -ulong i386boot_romdata_start = (ulong)&_i386boot_romdata_start; /* datasegment in flash (also code+rodata end) */ -ulong i386boot_romdata_dest = (ulong)&_i386boot_romdata_dest; /* data location segment in ram */ -ulong i386boot_romdata_size = (ulong)&_i386boot_romdata_size; /* size of data segment */ -ulong i386boot_bss_start = (ulong)&_i386boot_bss_start; /* bss start */ -ulong i386boot_bss_size = (ulong)&_i386boot_bss_size; /* bss size */ - +/* Exports from the Linker Script */ +extern ulong _i386boot_text_start; +extern ulong _i386boot_rel_dyn_start; +extern ulong _i386boot_rel_dyn_end; +extern ulong _i386boot_bss_start; +extern ulong _i386boot_bss_size; +void ram_bootstrap (void *); const char version_string[] = U_BOOT_VERSION" (" U_BOOT_DATE " - " U_BOOT_TIME ")"; -static int heap_init(void) -{ - /* start malloc area right after the stack */ - ulong start = i386boot_bss_start + i386boot_bss_size + - CONFIG_SYS_STACK_SIZE; - - /* 4-byte aligned */ - start = (start+3)&~3; - - mem_malloc_init(start, CONFIG_SYS_MALLOC_LEN); - - return 0; -} - /************************************************************************ * Init Utilities * ************************************************************************ @@ -103,6 +79,7 @@ static int display_banner (void) { printf ("\n\n%s\n\n", version_string); +/* printf ("U-Boot code: %08lX -> %08lX data: %08lX -> %08lX\n" " BSS: %08lX -> %08lX stack: %08lX -> %08lX\n", i386boot_start, i386boot_romdata_start-1, @@ -111,6 +88,7 @@ static int display_banner (void) i386boot_bss_start+i386boot_bss_size, i386boot_bss_start+i386boot_bss_size+CONFIG_SYS_STACK_SIZE-1); +*/ return (0); } @@ -142,7 +120,6 @@ static void display_flash_config (ulong size) print_size (size, "\n"); } - /* * Breath some life into the board... * @@ -154,6 +131,7 @@ static void display_flash_config (ulong size) * can relocate the monitor code to RAM. */ + /* * All attempts to come up with a "common" initialization sequence * that works for all boards and architectures failed: some of the @@ -169,13 +147,12 @@ static void display_flash_config (ulong size) typedef int (init_fnc_t) (void); init_fnc_t *init_sequence[] = { - cpu_init, /* basic cpu dependent setup */ - board_init, /* basic board dependent setup */ + serial_init, + cpu_init_r, /* basic cpu dependent setup */ + board_early_init_r, /* basic board dependent setup */ dram_init, /* configure available RAM banks */ - heap_init, /* dependant on dram_init */ interrupt_init, /* set up exceptions */ timer_init, - serial_init, env_init, /* initialize environment */ init_baudrate, /* initialze baudrate settings */ serial_init, /* serial communications setup */ @@ -187,21 +164,86 @@ init_fnc_t *init_sequence[] = { gd_t *gd; -void start_i386boot (void) +/* + * Load U-Boot into RAM, initialize BSS, perform relocation adjustments + */ +void board_init_f (ulong stack_limit) +{ + void *text_start = &_i386boot_text_start; + void *u_boot_cmd_end = &__u_boot_cmd_end; + Elf32_Rel *rel_dyn_start = (Elf32_Rel *)&_i386boot_rel_dyn_start; + Elf32_Rel *rel_dyn_end = (Elf32_Rel *)&_i386boot_rel_dyn_end; + void *bss_start = &_i386boot_bss_start; + void *bss_size = &_i386boot_bss_size; + + size_t uboot_size; + void *ram_start; + ulong rel_offset; + Elf32_Rel *re; + + void (*start_func)(void *); + + /* compiler optimization barrier needed for GCC >= 3.4 */ + __asm__ __volatile__("": : :"memory"); + + uboot_size = (size_t)u_boot_cmd_end - (size_t)text_start; + ram_start = (void *)stack_limit - (uboot_size + (ulong)bss_size); + rel_offset = text_start - ram_start; + start_func = ram_bootstrap - rel_offset; + + /* First stage CPU initialization */ + if (cpu_init_f() != 0) + hang(); + + /* First stage Board initialization */ + if (board_early_init_f() != 0) + hang(); + + /* Copy U-Boot into RAM */ + memcpy(ram_start, text_start, (size_t)uboot_size); + + /* Clear BSS */ + memset(bss_start - rel_offset, 0, (size_t)bss_size); + + /* Perform relocation adjustments */ + for (re = rel_dyn_start; re < rel_dyn_end; re++) + { + if (re->r_offset >= TEXT_BASE) + if (*(ulong *)re->r_offset >= TEXT_BASE) + *(ulong *)(re->r_offset - rel_offset) -= (Elf32_Addr)rel_offset; + } + + start_func(ram_start); + + /* NOTREACHED - relocate_code() does not return */ + while(1); +} + +/* + * All attempts to jump straight from board_init_f() to board_init_r() + * have failed, hence this special 'bootstrap' function. + */ +void ram_bootstrap (void *ram_start) +{ + static gd_t gd_data; + + /* compiler optimization barrier needed for GCC >= 3.4 */ + __asm__ __volatile__("": : :"memory"); + + board_init_r(&gd_data, (ulong)ram_start); +} + +void board_init_r(gd_t *id, ulong ram_start) { char *s; int i; ulong size; - static gd_t gd_data; static bd_t bd_data; init_fnc_t **init_fnc_ptr; -#ifndef CONFIG_SKIP_RELOCATE_UBOOT - cmd_tbl_t *p; -#endif show_boot_progress(0x21); - gd = &gd_data; + gd = id; /* compiler optimization barrier needed for GCC >= 3.4 */ __asm__ __volatile__("": : :"memory"); @@ -212,10 +254,11 @@ void start_i386boot (void) gd->baudrate = CONFIG_BAUDRATE; -#ifndef CONFIG_SKIP_RELOCATE_UBOOT - /* Need to set relocation offset here for interrupt initialization */ - gd->reloc_off = CONFIG_SYS_BL_START_RAM - TEXT_BASE; -#endif + gd->flags |= GD_FLG_RELOC; /* tell others: relocation done */ + + mem_malloc_init((((ulong)ram_start - CONFIG_SYS_MALLOC_LEN)+3)&~3, + CONFIG_SYS_MALLOC_LEN); + for (init_fnc_ptr = init_sequence, i=0; *init_fnc_ptr; ++init_fnc_ptr, i++) { show_boot_progress(0xa130|i); @@ -225,26 +268,6 @@ void start_i386boot (void) } show_boot_progress(0x23); -#ifndef CONFIG_SKIP_RELOCATE_UBOOT - for (p = &__u_boot_cmd_start; p != &__u_boot_cmd_end; p++) { - ulong addr; - addr = (ulong) (p->cmd) + gd->reloc_off; - p->cmd = (int (*)(struct cmd_tbl_s *, int, int, char *[]))addr; - addr = (ulong)(p->name) + gd->reloc_off; - p->name = (char *)addr; - - if (p->usage != NULL) { - addr = (ulong)(p->usage) + gd->reloc_off; - p->usage = (char *)addr; - } - #ifdef CONFIG_SYS_LONGHELP - if (p->help != NULL) { - addr = (ulong)(p->help) + gd->reloc_off; - p->help = (char *)addr; - } - #endif - } -#endif /* configure available FLASH banks */ size = flash_init(); display_flash_config(size); |