firmware/eeprom_settings.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 by Miika Pekkarinen
  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
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "eeprom_settings.h"
  23 #include "eeprom_24cxx.h"
  24 #include "crc32.h"
  25
  26 #include "system.h"
  27 #include "string.h"
  28 #include "logf.h"
  29
  30 struct eeprom_settings firmware_settings;
  31
  32 static bool reset_config(void)
  33 {
  34     memset(&firmware_settings, 0, sizeof(struct eeprom_settings));
  35 #ifdef BOOTLOADER
  36     /* Don't reset settings if we are inside bootloader. */
  37     firmware_settings.initialized = false;
  38 #else
  39     firmware_settings.version = EEPROM_SETTINGS_VERSION;
  40     firmware_settings.initialized = true;
  41     firmware_settings.bootmethod = BOOT_RECOVERY;
  42     firmware_settings.bl_version = 0;
  43 #endif
  44
  45     return firmware_settings.initialized;
  46 }
  47
  48 bool eeprom_settings_init(void)
  49 {
  50     int ret;
  51     uint32_t sum;
  52
  53     eeprom_24cxx_init();
  54
  55     /* Check if player has been flashed. */
  56     if (detect_original_firmware())
  57     {
  58         memset(&firmware_settings, 0, sizeof(struct eeprom_settings));
  59         firmware_settings.initialized = false;
  60         logf("Rockbox in flash is required");
  61         return false;
  62     }
  63
  64     ret = eeprom_24cxx_read(0, &firmware_settings,
  65                             sizeof(struct eeprom_settings));
  66
  67     if (ret < 0)
  68     {
  69         memset(&firmware_settings, 0, sizeof(struct eeprom_settings));
  70         firmware_settings.initialized = false;
  71         return false;
  72     }
  73
  74     sum = crc_32(&firmware_settings, sizeof(struct eeprom_settings)-4,
  75                  0xffffffff);
  76
  77     logf("BL version: %d", firmware_settings.bl_version);
  78     if (firmware_settings.version != EEPROM_SETTINGS_VERSION)
  79     {
  80         logf("Version mismatch");
  81         return reset_config();
  82     }
  83
  84     if (firmware_settings.checksum != sum)
  85     {
  86         logf("Checksum mismatch");
  87         return reset_config();
  88     }
  89
  90 #ifndef BOOTLOADER
  91     if (firmware_settings.bl_version < EEPROM_SETTINGS_BL_MINVER)
  92     {
  93         logf("Too old bootloader: %d", firmware_settings.bl_version);
  94         return reset_config();
  95     }
  96 #endif
  97
  98     return true;
  99 }
 100
 101 bool eeprom_settings_store(void)
 102 {
 103     int ret;
 104     uint32_t sum;
 105
 106     if (!firmware_settings.initialized || detect_original_firmware())
 107     {
 108         logf("Rockbox in flash is required");
 109         return false;
 110     }
 111
 112     /* Update the checksum. */
 113     sum = crc_32(&firmware_settings, sizeof(struct eeprom_settings)-4,
 114                  0xffffffff);
 115     firmware_settings.checksum = sum;
 116     ret = eeprom_24cxx_write(0, &firmware_settings,
 117                              sizeof(struct eeprom_settings));
 118
 119     if (ret < 0)
 120         firmware_settings.initialized = false;
 121
 122     return ret;
 123 }
 124