mirror of
https://github.com/AsahiLinux/u-boot
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c73c6de60c
Signed-off-by: Graeme Russ <graeme.russ@gmail.com> Signed-off-by: Simon Glass <sjg@chromium.org>
259 lines
6.9 KiB
C
259 lines
6.9 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/relocate.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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* Getting the board up and running is a three-stage process:
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* 1) Execute from Flash, SDRAM Uninitialised
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* At this point, there is a limited amount of non-SDRAM memory
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* (typically the CPU cache, but can also be SRAM or even a buffer of
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* of some peripheral). This limited memory is used to hold:
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* - The initial copy of the Global Data Structure
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* - A temporary stack
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* - A temporary x86 Global Descriptor Table
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* - The pre-console buffer (if enabled)
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*
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* The following is performed during this phase of execution:
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* - Core low-level CPU initialisation
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* - Console initialisation
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* - SDRAM initialisation
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*
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* 2) Execute from Flash, SDRAM Initialised
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* At this point we copy Global Data from the initial non-SDRAM
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* memory and set up the permanent stack in SDRAM. The CPU cache is no
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* longer being used as temporary memory, so we can now fully enable
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* it.
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*
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* The following is performed during this phase of execution:
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* - Create final stack in SDRAM
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* - Copy Global Data from temporary memory to SDRAM
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* - Enabling of CPU cache(s),
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* - Copying of U-Boot code and data from Flash to RAM
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* - Clearing of the BSS
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* - ELF relocation adjustments
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*
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* 3) Execute from SDRAM
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* The following is performed during this phase of execution:
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* - All remaining initialisation
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*/
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/*
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* The requirements for any new initalization function is simple: it is
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* a function with no parameters which returns an integer return code,
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* where 0 means "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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/*
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* init_sequence_f is the list of init functions which are run when U-Boot
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* is executing from Flash with a limited 'C' environment. The following
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* limitations must be considered when implementing an '_f' function:
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* - 'static' variables are read-only
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* - Global Data (gd->xxx) is read/write
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* - Stack space is limited
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*
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* The '_f' sequence must, as a minimum, initialise SDRAM. It _should_
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* also initialise the console (to provide early debug output)
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*/
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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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/*
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* init_sequence_f_r is the list of init functions which are run when
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* U-Boot is executing from Flash with a semi-limited 'C' environment.
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* The following limitations must be considered when implementing an
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* '_f_r' function:
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* - 'static' variables are read-only
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* - Global Data (gd->xxx) is read/write
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*
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* The '_f_r' sequence must, as a minimum, copy U-Boot to RAM (if
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* supported). It _should_, if possible, copy global data to RAM and
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* initialise the CPU caches (to speed up the relocation process)
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*/
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init_fnc_t *init_sequence_f_r[] = {
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init_cache_f_r,
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copy_uboot_to_ram,
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clear_bss,
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do_elf_reloc_fixups,
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NULL,
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};
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/*
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* init_sequence_r is the list of init functions which are run when U-Boot
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* is executing from RAM with a full 'C' environment. There are no longer
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* any limitations which must be considered when implementing an '_r'
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* function, (i.e.'static' variables are read/write)
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*
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* If not already done, the '_r' sequence must copy global data to RAM and
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* (should) initialise the CPU caches.
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*/
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init_fnc_t *init_sequence_r[] = {
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set_reloc_flag_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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serial_initialize_r,
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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_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_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_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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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 and console are now initialised. The final stack can now
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* be setup in SDRAM. Code execution will continue in Flash, but
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* 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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do_init_loop(init_sequence_f_r);
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/*
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* U-Boot has been copied into SDRAM, the BSS has been cleared etc.
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* Transfer execution from Flash to RAM by calculating the address
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* of the in-RAM copy of board_init_r() and calling it
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*/
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(board_init_r + gd->reloc_off)(gd, gd->relocaddr);
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/* NOTREACHED - board_init_r() does not return */
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while (1)
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;
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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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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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