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https://github.com/brain-hackers/u-boot-brain
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d47ab0ecde
This patch moves towards reducing board.c to simply a set of init cores for the three initialisation phases (Flash, Flash/RAM, and RAM), a set of three init function arrays and a init function array processing function
279 lines
6.4 KiB
C
279 lines
6.4 KiB
C
/*
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* (C) Copyright 2008-2011
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* Graeme Russ, <graeme.russ@gmail.com>
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*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
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*
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* (C) Copyright 2002
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* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <stdio_dev.h>
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#include <asm/u-boot-x86.h>
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#include <asm/processor.h>
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#include <asm/init_helpers.h>
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#include <asm/init_wrappers.h>
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/*
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* Breath some life into the board...
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*
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* Initialize an SMC for serial comms, and carry out some hardware
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* tests.
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*
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* The first part of initialization is running from Flash memory;
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* its main purpose is to initialize the RAM so that we
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* can relocate the monitor code to RAM.
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*/
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/*
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* All attempts to come up with a "common" initialization sequence
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* that works for all boards and architectures failed: some of the
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* requirements are just _too_ different. To get rid of the resulting
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* mess of board dependend #ifdef'ed code we now make the whole
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* initialization sequence configurable to the user.
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*
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* The requirements for any new initalization function is simple: it
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* receives a pointer to the "global data" structure as it's only
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* argument, and returns an integer return code, where 0 means
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* "continue" and != 0 means "fatal error, hang the system".
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*/
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typedef int (init_fnc_t) (void);
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static int calculate_relocation_address(void);
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static int copy_gd_to_ram(void);
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init_fnc_t *init_sequence_f[] = {
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cpu_init_f,
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board_early_init_f,
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env_init,
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init_baudrate_f,
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serial_init,
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console_init_f,
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dram_init_f,
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calculate_relocation_address,
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NULL,
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};
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init_fnc_t *init_sequence_r[] = {
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init_bd_struct_r,
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mem_malloc_init_r,
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cpu_init_r,
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board_early_init_r,
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dram_init,
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interrupt_init,
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timer_init,
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display_banner,
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display_dram_config,
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#ifdef CONFIG_SERIAL_MULTI
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serial_initialize_r,
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#endif
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#ifndef CONFIG_SYS_NO_FLASH
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flash_init_r,
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#endif
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env_relocate_r,
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#ifdef CONFIG_CMD_NET
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init_ip_address_r,
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#endif
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#ifdef CONFIG_PCI
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pci_init_r,
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#endif
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stdio_init,
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jumptable_init_r,
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console_init_r,
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#ifdef CONFIG_MISC_INIT_R
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misc_init_r,
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#endif
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#if defined(CONFIG_CMD_PCMCIA) && !defined(CONFIG_CMD_IDE)
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pci_init_r,
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#endif
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#if defined(CONFIG_CMD_KGDB)
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kgdb_init_r,
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#endif
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enable_interrupts_r,
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#ifdef CONFIG_STATUS_LED
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status_led_set_r,
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#endif
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set_load_addr_r,
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#if defined(CONFIG_CMD_NET)
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set_bootfile_r,
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#endif
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#if defined(CONFIG_CMD_IDE)
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ide_init_r,
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#endif
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#if defined(CONFIG_CMD_SCSI)
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scsi_init_r,
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#endif
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#if defined(CONFIG_CMD_DOC)
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doc_init_r,
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#endif
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#ifdef CONFIG_BITBANGMII
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bb_miiphy_init_r,
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#endif
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#if defined(CONFIG_CMD_NET)
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eth_initialize_r,
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#ifdef CONFIG_RESET_PHY_R
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reset_phy_r,
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#endif
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#endif
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#ifdef CONFIG_LAST_STAGE_INIT
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last_stage_init,
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#endif
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NULL,
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};
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static void do_init_loop(init_fnc_t **init_fnc_ptr)
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{
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for (; *init_fnc_ptr; ++init_fnc_ptr) {
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WATCHDOG_RESET();
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if ((*init_fnc_ptr)() != 0)
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hang();
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}
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}
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static int calculate_relocation_address(void)
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{
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ulong text_start = (ulong)&__text_start;
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ulong bss_end = (ulong)&__bss_end;
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ulong dest_addr;
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/*
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* NOTE: All destination address are rounded down to 16-byte
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* boundary to satisfy various worst-case alignment
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* requirements
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*/
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/* Global Data is at top of available memory */
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dest_addr = gd->ram_size;
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dest_addr -= GENERATED_GBL_DATA_SIZE;
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dest_addr &= ~15;
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gd->new_gd_addr = dest_addr;
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/* GDT is below Global Data */
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dest_addr -= X86_GDT_SIZE;
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dest_addr &= ~15;
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gd->gdt_addr = dest_addr;
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/* Stack is below GDT */
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gd->start_addr_sp = dest_addr;
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/* U-Boot is below the stack */
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dest_addr -= CONFIG_SYS_STACK_SIZE;
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dest_addr -= (bss_end - text_start);
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dest_addr &= ~15;
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gd->relocaddr = dest_addr;
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gd->reloc_off = (dest_addr - text_start);
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return 0;
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}
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/* Perform all steps necessary to get RAM initialised ready for relocation */
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void board_init_f(ulong boot_flags)
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{
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gd->flags = boot_flags;
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do_init_loop(init_sequence_f);
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/*
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* SDRAM is now initialised, U-Boot has been copied into SDRAM,
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* the BSS has been cleared etc. The final stack can now be setup
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* in SDRAM. Code execution will continue (momentarily) in Flash,
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* but with the stack in SDRAM and Global Data in temporary memory
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* (CPU cache)
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*/
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board_init_f_r_trampoline(gd->start_addr_sp);
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/* NOTREACHED - board_init_f_r_trampoline() does not return */
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while (1)
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;
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}
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void board_init_f_r(void)
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{
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if (copy_gd_to_ram() != 0)
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hang();
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if (init_cache() != 0)
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hang();
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relocate_code(0, gd, 0);
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/* NOTREACHED - relocate_code() does not return */
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while (1)
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;
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}
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static int copy_gd_to_ram(void)
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{
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gd_t *ram_gd;
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/*
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* Global data is still in temporary memory (the CPU cache).
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* calculate_relocation_address() has set gd->new_gd_addr to
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* where the global data lives in RAM but getting it there
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* safely is a bit tricky due to the 'F-Segment Hack' that
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* we need to use for x86
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*/
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ram_gd = (gd_t *)gd->new_gd_addr;
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memcpy((void *)ram_gd, gd, sizeof(gd_t));
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/*
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* Reload the Global Descriptor Table so FS points to the
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* in-RAM copy of Global Data (calculate_relocation_address()
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* has already calculated the in-RAM location of the GDT)
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*/
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ram_gd->gd_addr = (ulong)ram_gd;
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init_gd(ram_gd, (u64 *)gd->gdt_addr);
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return 0;
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}
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void board_init_r(gd_t *id, ulong dest_addr)
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{
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gd->flags |= GD_FLG_RELOC;
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/* compiler optimization barrier needed for GCC >= 3.4 */
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__asm__ __volatile__("" : : : "memory");
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do_init_loop(init_sequence_r);
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/* main_loop() can return to retry autoboot, if so just run it again. */
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for (;;)
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main_loop();
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/* NOTREACHED - no way out of command loop except booting */
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}
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void hang(void)
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{
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puts("### ERROR ### Please RESET the board ###\n");
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for (;;)
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;
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}
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