/* * (C) Copyright 2008-2011 * Graeme Russ, * * (C) Copyright 2002 * Daniel Engström, Omicron Ceti AB, * * (C) Copyright 2002 * Wolfgang Denk, DENX Software Engineering, * * (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 /* * 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); static int calculate_relocation_address(void); static int copy_gd_to_ram(void); init_fnc_t *init_sequence_f[] = { cpu_init_f, board_early_init_f, env_init, init_baudrate_f, serial_init, console_init_f, dram_init_f, calculate_relocation_address, NULL, }; init_fnc_t *init_sequence_r[] = { init_bd_struct_r, mem_malloc_init_r, cpu_init_r, board_early_init_r, dram_init, interrupt_init, timer_init, display_banner, display_dram_config, #ifdef CONFIG_SERIAL_MULTI serial_initialize_r, #endif #ifndef CONFIG_SYS_NO_FLASH flash_init_r, #endif env_relocate_r, #ifdef CONFIG_CMD_NET init_ip_address_r, #endif #ifdef CONFIG_PCI pci_init_r, #endif stdio_init, jumptable_init_r, console_init_r, #ifdef CONFIG_MISC_INIT_R misc_init_r, #endif #if defined(CONFIG_CMD_PCMCIA) && !defined(CONFIG_CMD_IDE) pci_init_r, #endif #if defined(CONFIG_CMD_KGDB) kgdb_init_r, #endif enable_interrupts_r, #ifdef CONFIG_STATUS_LED status_led_set_r, #endif set_load_addr_r, #if defined(CONFIG_CMD_NET) set_bootfile_r, #endif #if defined(CONFIG_CMD_IDE) ide_init_r, #endif #if defined(CONFIG_CMD_SCSI) scsi_init_r, #endif #if defined(CONFIG_CMD_DOC) doc_init_r, #endif #ifdef CONFIG_BITBANGMII bb_miiphy_init_r, #endif #if defined(CONFIG_CMD_NET) eth_initialize_r, #ifdef CONFIG_RESET_PHY_R reset_phy_r, #endif #endif #ifdef CONFIG_LAST_STAGE_INIT last_stage_init, #endif NULL, }; static void do_init_loop(init_fnc_t **init_fnc_ptr) { for (; *init_fnc_ptr; ++init_fnc_ptr) { WATCHDOG_RESET(); if ((*init_fnc_ptr)() != 0) hang(); } } static int calculate_relocation_address(void) { ulong text_start = (ulong)&__text_start; ulong bss_end = (ulong)&__bss_end; ulong dest_addr; /* * NOTE: All destination address are rounded down to 16-byte * boundary to satisfy various worst-case alignment * requirements */ /* Global Data is at top of available memory */ dest_addr = gd->ram_size; dest_addr -= GENERATED_GBL_DATA_SIZE; dest_addr &= ~15; gd->new_gd_addr = dest_addr; /* GDT is below Global Data */ dest_addr -= X86_GDT_SIZE; dest_addr &= ~15; gd->gdt_addr = dest_addr; /* Stack is below GDT */ gd->start_addr_sp = dest_addr; /* U-Boot is below the stack */ dest_addr -= CONFIG_SYS_STACK_SIZE; dest_addr -= (bss_end - text_start); dest_addr &= ~15; gd->relocaddr = dest_addr; gd->reloc_off = (dest_addr - text_start); return 0; } /* Perform all steps necessary to get RAM initialised ready for relocation */ void board_init_f(ulong boot_flags) { gd->flags = boot_flags; do_init_loop(init_sequence_f); /* * SDRAM is now initialised, U-Boot has been copied into SDRAM, * the BSS has been cleared etc. The final stack can now be setup * in SDRAM. Code execution will continue (momentarily) 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); /* NOTREACHED - board_init_f_r_trampoline() does not return */ while (1) ; } void board_init_f_r(void) { if (copy_gd_to_ram() != 0) hang(); if (init_cache() != 0) hang(); relocate_code(0, gd, 0); /* NOTREACHED - relocate_code() does not return */ while (1) ; } static int copy_gd_to_ram(void) { gd_t *ram_gd; /* * Global data is still in temporary memory (the CPU cache). * calculate_relocation_address() has set gd->new_gd_addr to * where the global data lives in RAM but getting it there * safely is a bit tricky due to the 'F-Segment Hack' that * we need to use for x86 */ ram_gd = (gd_t *)gd->new_gd_addr; memcpy((void *)ram_gd, gd, sizeof(gd_t)); /* * Reload the Global Descriptor Table so FS points to the * in-RAM copy of Global Data (calculate_relocation_address() * has already calculated the in-RAM location of the GDT) */ ram_gd->gd_addr = (ulong)ram_gd; init_gd(ram_gd, (u64 *)gd->gdt_addr); return 0; } void board_init_r(gd_t *id, ulong dest_addr) { gd->flags |= GD_FLG_RELOC; /* compiler optimization barrier needed for GCC >= 3.4 */ __asm__ __volatile__("" : : : "memory"); do_init_loop(init_sequence_r); /* 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 (;;) ; }