/* * (C) Copyright 2002 * Daniel Engstr�m, Omicron Ceti AB, daniel@omicron.se * * (C) Copyright 2002 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH * Marius Groeger * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_BITBANGMII #include #endif DECLARE_GLOBAL_DATA_PTR; /* 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 *, ulong); const char version_string[] = U_BOOT_VERSION" (" U_BOOT_DATE " - " U_BOOT_TIME ")"; /************************************************************************ * Init Utilities * ************************************************************************ * Some of this code should be moved into the core functions, * or dropped completely, * but let's get it working (again) first... */ static int init_baudrate (void) { char tmp[64]; /* long enough for environment variables */ int i = getenv_r("baudrate", tmp, 64); gd->baudrate = (i != 0) ? (int) simple_strtoul (tmp, NULL, 10) : CONFIG_BAUDRATE; return (0); } 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, i386boot_romdata_dest, i386boot_romdata_dest+i386boot_romdata_size-1, i386boot_bss_start, i386boot_bss_start+i386boot_bss_size-1, i386boot_bss_start+i386boot_bss_size, i386boot_bss_start+i386boot_bss_size+CONFIG_SYS_STACK_SIZE-1); */ return (0); } /* * WARNING: this code looks "cleaner" than the PowerPC version, but * has the disadvantage that you either get nothing, or everything. * On PowerPC, you might see "DRAM: " before the system hangs - which * gives a simple yet clear indication which part of the * initialization if failing. */ static int display_dram_config (void) { int i; puts ("DRAM Configuration:\n"); for (i=0; ibd->bi_dram[i].start); print_size (gd->bd->bi_dram[i].size, "\n"); } return (0); } static void display_flash_config (ulong size) { puts ("Flash: "); print_size (size, "\n"); } /* * Breath some life into the board... * * Initialize an SMC for serial comms, and carry out some hardware * tests. * * The first part of initialization is running from Flash memory; * its main purpose is to initialize the RAM so that we * 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 * requirements are just _too_ different. To get rid of the resulting * mess of board dependend #ifdef'ed code we now make the whole * initialization sequence configurable to the user. * * The requirements for any new initalization function is simple: it * receives a pointer to the "global data" structure as it's only * argument, and returns an integer return code, where 0 means * "continue" and != 0 means "fatal error, hang the system". */ typedef int (init_fnc_t) (void); init_fnc_t *init_sequence[] = { cpu_init_r, /* basic cpu dependent setup */ board_early_init_r, /* basic board dependent setup */ dram_init, /* configure available RAM banks */ interrupt_init, /* set up exceptions */ timer_init, env_init, /* initialize environment */ init_baudrate, /* initialze baudrate settings */ serial_init, /* serial communications setup */ display_banner, display_dram_config, NULL, }; static gd_t gd_data; gd_t *gd; /* * 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; ulong bss_size = (ulong)&_i386boot_bss_size; ulong uboot_size; void *dest_addr; ulong rel_offset; Elf32_Rel *re; void (*start_func)(void *, ulong); uboot_size = (ulong)u_boot_cmd_end - (ulong)text_start; dest_addr = (void *)stack_limit - (uboot_size + (ulong)bss_size); rel_offset = text_start - dest_addr; 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(dest_addr, text_start, uboot_size); /* Clear BSS */ memset(bss_start - rel_offset, 0, 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; } /* Enter the relocated U-Boot! */ start_func(dest_addr, rel_offset); /* NOTREACHED - board_init_f() does not return */ while(1); } /* * We cannot initialize gd_data in board_init_f() because we would be * attempting to write to flash (I have even tried using manual relocation * adjustments on pointers but it just won't work) and board_init_r() does * not have enough arguments to allow us to pass the relocation offset * straight up. This bootstrap function (which runs in RAM) is used to * setup gd_data in order to pass the relocation offset to the rest of * U-Boot. * * TODO: The compiler optimization barrier is intended to stop GCC from * optimizing this function into board_init_f(). It seems to work without * it, but I've left it in to be sure. I think also that the barrier in * board_init_r() is no longer needed, but left it in 'just in case' */ void ram_bootstrap (void *dest_addr, ulong rel_offset) { /* compiler optimization barrier needed for GCC >= 3.4 */ __asm__ __volatile__("": : :"memory"); /* tell others: relocation done */ gd_data.reloc_off = rel_offset; gd_data.flags |= GD_FLG_RELOC; board_init_r(&gd_data, (ulong)dest_addr); } void board_init_r(gd_t *id, ulong dest_addr) { char *s; int i; ulong size; static bd_t bd_data; init_fnc_t **init_fnc_ptr; show_boot_progress(0x21); gd = id; /* compiler optimization barrier needed for GCC >= 3.4 */ __asm__ __volatile__("": : :"memory"); gd->bd = &bd_data; memset (gd->bd, 0, sizeof (bd_t)); show_boot_progress(0x22); gd->baudrate = CONFIG_BAUDRATE; mem_malloc_init((((ulong)dest_addr - 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); if ((*init_fnc_ptr)() != 0) { hang (); } } show_boot_progress(0x23); #ifdef CONFIG_SERIAL_MULTI serial_initialize(); #endif /* configure available FLASH banks */ size = flash_init(); display_flash_config(size); show_boot_progress(0x24); show_boot_progress(0x25); /* initialize environment */ env_relocate (); show_boot_progress(0x26); #ifdef CONFIG_CMD_NET /* IP Address */ bd_data.bi_ip_addr = getenv_IPaddr ("ipaddr"); #endif #if defined(CONFIG_PCI) /* * Do pci configuration */ pci_init(); #endif show_boot_progress(0x27); stdio_init (); jumptable_init (); /* Initialize the console (after the relocation and devices init) */ console_init_r(); #ifdef CONFIG_MISC_INIT_R /* miscellaneous platform dependent initialisations */ misc_init_r(); #endif #if defined(CONFIG_CMD_PCMCIA) && !defined(CONFIG_CMD_IDE) WATCHDOG_RESET(); puts ("PCMCIA:"); pcmcia_init(); #endif #if defined(CONFIG_CMD_KGDB) WATCHDOG_RESET(); puts("KGDB: "); kgdb_init(); #endif /* enable exceptions */ enable_interrupts(); show_boot_progress(0x28); /* Must happen after interrupts are initialized since * an irq handler gets installed */ #ifdef CONFIG_SERIAL_SOFTWARE_FIFO serial_buffered_init(); #endif #ifdef CONFIG_STATUS_LED status_led_set (STATUS_LED_BOOT, STATUS_LED_BLINKING); #endif udelay(20); set_timer (0); /* Initialize from environment */ if ((s = getenv ("loadaddr")) != NULL) { load_addr = simple_strtoul (s, NULL, 16); } #if defined(CONFIG_CMD_NET) if ((s = getenv ("bootfile")) != NULL) { copy_filename (BootFile, s, sizeof (BootFile)); } #endif WATCHDOG_RESET(); #if defined(CONFIG_CMD_IDE) WATCHDOG_RESET(); puts("IDE: "); ide_init(); #endif #if defined(CONFIG_CMD_SCSI) WATCHDOG_RESET(); puts("SCSI: "); scsi_init(); #endif #if defined(CONFIG_CMD_DOC) WATCHDOG_RESET(); puts("DOC: "); doc_init(); #endif #ifdef CONFIG_BITBANGMII bb_miiphy_init(); #endif #if defined(CONFIG_CMD_NET) #if defined(CONFIG_NET_MULTI) WATCHDOG_RESET(); puts("Net: "); #endif eth_initialize(gd->bd); #endif #if ( defined(CONFIG_CMD_NET)) && (0) WATCHDOG_RESET(); # ifdef DEBUG puts ("Reset Ethernet PHY\n"); # endif reset_phy(); #endif #ifdef CONFIG_LAST_STAGE_INIT WATCHDOG_RESET(); /* * Some parts can be only initialized if all others (like * Interrupts) are up and running (i.e. the PC-style ISA * keyboard). */ last_stage_init(); #endif #ifdef CONFIG_POST post_run (NULL, POST_RAM | post_bootmode_get(0)); #endif show_boot_progress(0x29); /* main_loop() can return to retry autoboot, if so just run it again. */ for (;;) { main_loop(); } /* NOTREACHED - no way out of command loop except booting */ } void hang (void) { puts ("### ERROR ### Please RESET the board ###\n"); for (;;); } unsigned long do_go_exec (ulong (*entry)(int, char *[]), int argc, char *argv[]) { /* * x86 does not use a dedicated register to pass the pointer * to the global_data */ argv[-1] = (char *)gd; return (entry) (argc, argv); }