rockbox/bootloader/ipodnano2g.c

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2009 by Dave Chapman
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>

#include "config.h"

#include "inttypes.h"
#include "cpu.h"
#include "system.h"
#include "lcd.h"
#include "i2c-s5l8700.h"
#include "kernel.h"
#include "thread.h"
#include "storage.h"
#include "fat.h"
#include "disk.h"
#include "font.h"
#include "backlight.h"
#include "backlight-target.h"
#include "button.h"
#include "panic.h"
#include "power.h"
#include "file.h"
#include "common.h"

/* Safety measure - maximum allowed firmware image size. 
   The largest known current (October 2009) firmware is about 6.2MB so 
   we set this to 8MB. 
*/
#define MAX_LOADSIZE (8*1024*1024)

/* The buffer to load the firmware into */
unsigned char *loadbuffer = (unsigned char *)0x08000000;

/* Bootloader version */
char version[] = APPSVERSION;

extern int line;

void fatal_error(void)
{
    extern int line;
    bool holdstatus=false;

    /* System font is 6 pixels wide */
    printf("Hold MENU+SELECT to");
    printf("reboot then SELECT+PLAY");
    printf("for disk mode");
    lcd_update();

    while (1) {
        if (button_hold() != holdstatus) {
            if (button_hold()) {
                holdstatus=true;
                lcd_puts(0, line, "Hold switch on!");
            } else {
                holdstatus=false;
                lcd_puts(0, line, "               ");
            }
            lcd_update();
        }
    }
}

void main(void)
{
    int i;
    int btn;
    int rc;
    bool button_was_held;

    /* Check the button hold status as soon as possible - to 
       give the user maximum chance to turn it on in order to
       reset the settings in rockbox. */
    button_was_held = button_hold();

    system_init();
    kernel_init();

    i2c_init();

    enable_irq();

    backlight_init(); /* Turns on the backlight */

    lcd_init();
    font_init();

    lcd_set_foreground(LCD_WHITE);
    lcd_set_background(LCD_BLACK);
    lcd_clear_display();

//    button_init();

    btn=0; /* TODO */

    /* Enable bootloader messages */
    if (btn==BUTTON_RIGHT)
        verbose = true;

    lcd_setfont(FONT_SYSFIXED);

    printf("Rockbox boot loader");
    printf("Version: %s", version);

    i = storage_init();

    if (i != 0) {
        printf("ATA error: %d", i);
        fatal_error();
    }

    disk_init();
    rc = disk_mount_all();
    if (rc<=0)
    {
        printf("No partition found");
        fatal_error();
    }

    if (button_was_held || (btn==BUTTON_MENU)) {
        /* If either the hold switch was on, or the Menu button was held, then 
           try the Apple firmware */

        printf("Loading original firmware...");

        /* TODO */
        fatal_error();
    } else {
        printf("Loading Rockbox...");
        rc=load_firmware(loadbuffer, BOOTFILE, MAX_LOADSIZE);

        if (rc != EOK) {
            printf("Error!");
            printf("Can't load " BOOTFILE ": ");
            printf(strerror(rc));
            fatal_error();
        }

        printf("Rockbox loaded.");
    }

    /* If we get here, we have a new firmware image at 0x08000000, run it */

    disable_irq();

    /* Branch to start of DRAM */
    asm volatile("ldr pc, =0x08000000");
}