common/startup.c

   1 /*
   2  * (C) Copyright 2002-2006
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2002
   6  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   7  * Marius Groeger <mgroeger@sysgo.de>
   8  *
   9  * See file CREDITS for list of people who contributed to this
  10  * project.
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License as
  14  * published by the Free Software Foundation; either version 2 of
  15  * the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  25  * MA 02111-1307 USA
  26  */
  27
  28 /**
  29  * @file
  30  * @brief Main entry into the C part of U-Boot-v2
  31  */
  32 #include <common.h>
  33 #include <init.h>
  34 #include <command.h>
  35 #include <malloc.h>
  36 #include <mem_malloc.h>
  37 #include <debug_ll.h>
  38 #include <fs.h>
  39 #include <linux/stat.h>
  40 #include <environment.h>
  41 #include <reloc.h>
  42 #include <asm-generic/memory_layout.h>
  43
  44 extern initcall_t __u_boot_initcalls_start[], __u_boot_early_initcalls_end[],
  45                   __u_boot_initcalls_end[];
  46
  47 static void display_meminfo(void)
  48 {
  49         ulong mstart = mem_malloc_start();
  50         ulong mend   = mem_malloc_end();
  51         ulong msize  = mend - mstart + 1;
  52
  53         debug("U-Boot code : 0x%08lX -> 0x%08lX  BSS: -> 0x%08lX\n",
  54                _u_boot_start, _bss_start, _bss_end);
  55         printf("Malloc space: 0x%08lx -> 0x%08lx (size %s)\n",
  56                 mstart, mend, size_human_readable(msize));
  57 #ifdef CONFIG_ARM
  58         printf("Stack space : 0x%08lx -> 0x%08lx (size %s)\n",
  59                 STACK_BASE, STACK_BASE + STACK_SIZE,
  60                 size_human_readable(STACK_SIZE));
  61 #endif
  62 }
  63
  64 #ifdef CONFIG_HAS_EARLY_INIT
  65
  66 #define EARLY_INITDATA (CFG_INIT_RAM_ADDR + CFG_INIT_RAM_SIZE \
  67                 - CONFIG_EARLY_INITDATA_SIZE)
  68
  69 void *init_data_ptr = (void *)EARLY_INITDATA;
  70
  71 void early_init (void)
  72 {
  73         /* copy the early initdata segment to early init RAM */
  74         memcpy((void *)EARLY_INITDATA, RELOC(&__early_init_data_begin),
  75                                 (ulong)&__early_init_data_end -
  76                                 (ulong)&__early_init_data_begin);
  77 }
  78
  79 #endif /* CONFIG_HAS_EARLY_INIT */
  80
  81 #ifdef CONFIG_DEFAULT_ENVIRONMENT
  82 #include <uboot_default_env.h>
  83
  84 static struct memory_platform_data default_env_platform_data = {
  85         .name = "defaultenv",
  86 };
  87
  88 static struct device_d default_env_dev = {
  89         .name           = "mem",
  90         .platform_data  = &default_env_platform_data,
  91 };
  92
  93 static int register_default_env(void)
  94 {
  95         default_env_dev.map_base = (unsigned long)default_environment;
  96         default_env_dev.size = sizeof(default_environment);
  97         register_device(&default_env_dev);
  98         return 0;
  99 }
 100
 101 device_initcall(register_default_env);
 102 #endif
 103
 104 static int mount_root(void)
 105 {
 106         mount("none", "ramfs", "/");
 107         mkdir("/dev", 0);
 108         mount("none", "devfs", "/dev");
 109         return 0;
 110 }
 111 fs_initcall(mount_root);
 112
 113 void start_uboot (void)
 114 {
 115         initcall_t *initcall;
 116         int result;
 117         struct stat s;
 118
 119 #ifdef CONFIG_HAS_EARLY_INIT
 120         /* We are running from RAM now, copy early initdata from
 121          * early RAM to RAM
 122          */
 123         memcpy(&__early_init_data_begin, init_data_ptr,
 124                         (ulong)&__early_init_data_end -
 125                         (ulong)&__early_init_data_begin);
 126         init_data_ptr = &__early_init_data_begin;
 127 #endif /* CONFIG_HAS_EARLY_INIT */
 128
 129         for (initcall = __u_boot_initcalls_start;
 130                         initcall < __u_boot_initcalls_end; initcall++) {
 131                 PUTHEX_LL(*initcall);
 132                 PUTC_LL('\n');
 133                 result = (*initcall)();
 134                 if (result)
 135                         hang();
 136         }
 137
 138         display_meminfo();
 139
 140 #ifdef CONFIG_ENV_HANDLING
 141         if (envfs_load("/dev/env0", "/env")) {
 142 #ifdef CONFIG_DEFAULT_ENVIRONMENT
 143                 printf("no valid environment found on /dev/env0. "
 144                         "Using default environment\n");
 145                 envfs_load("/dev/defaultenv", "/env");
 146 #endif
 147         }
 148 #endif
 149         printf("running /env/bin/init...\n");
 150
 151         if (!stat("/env/bin/init", &s)) {
 152                 run_command("source /env/bin/init", 0);
 153         } else {
 154                 printf("not found\n");
 155         }
 156
 157         /* main_loop() can return to retry autoboot, if so just run it again. */
 158         for (;;)
 159                 run_shell();
 160
 161         /* NOTREACHED - no way out of command loop except booting */
 162 }
 163
 164 void hang (void)
 165 {
 166         puts ("### ERROR ### Please RESET the board ###\n");
 167         for (;;);
 168 }
 169
 170 /* Everything needed to cleanly shutdown U-Boot.
 171  * Should be called before starting an OS to get
 172  * the devices into a clean state
 173  */
 174 void shutdown_uboot(void)
 175 {
 176         devices_shutdown();
 177 }
 178