bootloader/sansa_as3525.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2008 by Rafaël Carré
  11  *
  12  * Based on Rockbox iriver bootloader by Linus Nielsen Feltzing
  13  * and the ipodlinux bootloader by Daniel Palffy and Bernard Leach
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  21  * KIND, either express or implied.
  22  *
  23  ****************************************************************************/
  24
  25 #include <stdio.h>
  26 #include <system.h>
  27 #include <inttypes.h>
  28 #include "config.h"
  29 #include "lcd.h"
  30 #include "backlight.h"
  31 #include "button-target.h"
  32 #include "common.h"
  33 #include "storage.h"
  34 #include "disk.h"
  35 #include "panic.h"
  36 #include "power.h"
  37
  38 int show_logo(void);
  39
  40 void main(void) __attribute__((naked, noreturn));
  41 void main(void)
  42 {
  43     unsigned char* loadbuffer;
  44     int buffer_size;
  45     void(*kernel_entry)(void);
  46     int ret;
  47
  48     system_init();
  49     kernel_init();
  50
  51     enable_irq();
  52
  53     lcd_init();
  54     show_logo();
  55
  56     backlight_init();
  57
  58     button_init_device();
  59     int btn = button_read_device();
  60
  61 #if !defined(SANSA_FUZE) && !defined(SANSA_CLIP)
  62     if (button_hold())
  63     {
  64         verbose = true;
  65         lcd_clear_display();
  66         printf("Hold switch on");
  67         printf("Shutting down...");
  68         sleep(HZ);
  69         power_off();
  70     }
  71 #endif
  72
  73     /* Enable bootloader messages if any button is pressed */
  74     if (btn)
  75     {
  76         lcd_clear_display();
  77         verbose = true;
  78     }
  79
  80     ret = storage_init();
  81     if(ret < 0)
  82         error(EATA,ret);
  83
  84     if(!disk_init(IF_MV(0)))
  85         panicf("disk_init failed!");
  86
  87     ret = disk_mount_all();
  88
  89     if(ret <= 0)
  90         error(EDISK, ret);
  91
  92     printf("Loading firmware");
  93
  94     loadbuffer = (unsigned char*)DRAM_ORIG; /* DRAM */
  95     buffer_size = (int)(loadbuffer + (DRAM_SIZE) - TTB_SIZE);
  96
  97     ret = load_firmware(loadbuffer, BOOTFILE, buffer_size);
  98     if(ret < 0)
  99         error(EBOOTFILE, ret);
 100
 101     disable_irq(); /* disable irq until we have copied the new vectors */
 102
 103     if (ret == EOK)
 104     {
 105         kernel_entry = (void*) loadbuffer;
 106         printf("Executing");
 107         kernel_entry();
 108         printf("ERR: Failed to boot");
 109     }
 110
 111     /* never returns */
 112     while(1) ;
 113 }