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  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19
  20 #include "eeprom_settings.h"
  21 #include "eeprom_24cxx.h"
  22 #include "crc32.h"
  23
  24 #include "system.h"
  25 #include "string.h"
  26 #include "logf.h"
  27
  28 struct eeprom_settings firmware_settings;
  29
  30 static bool reset_config(void)
  31 {
  32     memset(&firmware_settings, 0, sizeof(struct eeprom_settings));
  33 #ifdef BOOTLOADER
  34     /* Don't reset settings if we are inside bootloader. */
  35     firmware_settings.initialized = false;
  36 #else
  37     firmware_settings.version = EEPROM_SETTINGS_VERSION;
  38     firmware_settings.initialized = true;
  39     firmware_settings.bootmethod = BOOT_RECOVERY;
  40     firmware_settings.bl_version = 0;
  41 #endif
  42
  43     return firmware_settings.initialized;
  44 }
  45
  46 bool eeprom_settings_init(void)
  47 {
  48     int ret;
  49     uint32_t sum;
  50
  51     eeprom_24cxx_init();
  52
  53     /* Check if player has been flashed. */
  54     if (detect_original_firmware())
  55     {
  56         memset(&firmware_settings, 0, sizeof(struct eeprom_settings));
  57         firmware_settings.initialized = false;
  58         logf("Rockbox in flash is required");
  59         return false;
  60     }
  61
  62     ret = eeprom_24cxx_read(0, &firmware_settings,
  63                             sizeof(struct eeprom_settings));
  64
  65     if (ret < 0)
  66     {
  67         memset(&firmware_settings, 0, sizeof(struct eeprom_settings));
  68         firmware_settings.initialized = false;
  69         return false;
  70     }
  71
  72     sum = crc_32(&firmware_settings, sizeof(struct eeprom_settings)-4,
  73                  0xffffffff);
  74
  75     logf("BL version: %d", firmware_settings.bl_version);
  76     if (firmware_settings.version != EEPROM_SETTINGS_VERSION)
  77     {
  78         logf("Version mismatch");
  79         return reset_config();
  80     }
  81
  82     if (firmware_settings.checksum != sum)
  83     {
  84         logf("Checksum mismatch");
  85         return reset_config();
  86     }
  87
  88 #ifndef BOOTLOADER
  89     if (firmware_settings.bl_version < EEPROM_SETTINGS_BL_MINVER)
  90     {
  91         logf("Too old bootloader: %d", firmware_settings.bl_version);
  92         return reset_config();
  93     }
  94 #endif
  95
  96     return true;
  97 }
  98
  99 bool eeprom_settings_store(void)
 100 {
 101     int ret;
 102     uint32_t sum;
 103
 104     if (!firmware_settings.initialized || detect_original_firmware())
 105     {
 106         logf("Rockbox in flash is required");
 107         return false;
 108     }
 109
 110     /* Update the checksum. */
 111     sum = crc_32(&firmware_settings, sizeof(struct eeprom_settings)-4,
 112                  0xffffffff);
 113     firmware_settings.checksum = sum;
 114     ret = eeprom_24cxx_write(0, &firmware_settings,
 115                              sizeof(struct eeprom_settings));
 116
 117     if (ret < 0)
 118         firmware_settings.initialized = false;
 119
 120     return ret;
 121 }
 122