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-target.h"
  31 #include "button-target.h"
  32 #include "ascodec-target.h"
  33 #include "common.h"
  34 #include "storage.h"
  35 #include "disk.h"
  36 #include "panic.h"
  37
  38 int show_logo(void);
  39 void main(void)
  40 {
  41     unsigned char* loadbuffer;
  42     int buffer_size;
  43     void(*kernel_entry)(void);
  44     int ret;
  45
  46     system_init();
  47     kernel_init();
  48
  49     lcd_init();
  50     show_logo();
  51
  52     ascodec_init();  /* Required for backlight on e200v2 */
  53     _backlight_on();
  54
  55 #if 0 /* remove me when the bootloader can be considered finished */
  56     int btn = button_read_device();
  57
  58     /* Enable bootloader messages if any button is pressed */
  59     if (btn)
  60 #endif
  61     {
  62         lcd_clear_display();
  63         verbose = true;
  64     }
  65
  66     asm volatile(
  67             "mrs r0, cpsr             \n"
  68             "bic r0, r0, #0x80        \n" /* enable interrupts */
  69             "msr cpsr, r0             \n"
  70             : : : "r0" );
  71
  72     ret = storage_init();
  73     if(ret < 0)
  74         error(EATA,ret);
  75
  76     if(!disk_init(IF_MV(0)))
  77         panicf("disk_init failed!");
  78
  79     ret = disk_mount_all();
  80
  81     if(ret <= 0)
  82         error(EDISK, ret);
  83
  84     printf("Loading firmware");
  85
  86     loadbuffer = (unsigned char*)0x30000000; /* DRAM */
  87     buffer_size = (int)(loadbuffer + (MEM * 0x100000));
  88
  89     ret = load_firmware(loadbuffer, BOOTFILE, buffer_size);
  90     if(ret < 0)
  91         error(EBOOTFILE, ret);
  92
  93     asm volatile(
  94             "mrs r0, cpsr             \n"
  95             "orr r0, r0, #0x80        \n" /* disable interrupts */
  96             "msr cpsr, r0             \n"
  97             : : : "r0" );
  98
  99     if (ret == EOK)
 100     {
 101         kernel_entry = (void*) loadbuffer;
 102         printf("Executing");
 103         kernel_entry();
 104         printf("ERR: Failed to boot");
 105     }
 106
 107     /* never returns */
 108     while(1) ;
 109 }