/* Load mi4 firmware from a hidden disk partition */
int load_mi4_part(unsigned char* buf, struct partinfo* pinfo,
unsigned int buffer_size, bool disable_rebuild)
{
struct mi4header_t mi4header;
struct ppmi_header_t ppmi_header;
unsigned long sum;
/* Read header to find out how long the mi4 file is. */
storage_read_sectors(pinfo->start + PPMI_SECTOR_OFFSET,
PPMI_SECTORS, &ppmi_header);
/* The first four characters at 0x80000 (sector 1024) should be PPMI*/
if( memcmp(ppmi_header.magic, "PPMI", 4) )
return EFILE_NOT_FOUND;
printf("BL mi4 size: %x", ppmi_header.length);
/* Read mi4 header of the OF */
storage_read_sectors(pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
+ (ppmi_header.length/512), MI4_HEADER_SECTORS, &mi4header);
/* We don't support encrypted mi4 files yet */
if( (mi4header.plaintext) != (mi4header.mi4size-MI4_HEADER_SIZE))
return EINVALID_FORMAT;
/* MI4 file size */
printf("OF mi4 size: %x", mi4header.mi4size);
if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
return EFILE_TOO_BIG;
/* CRC32 */
printf("CRC32: %x", mi4header.crc32);
/* Rockbox model id */
printf("Model id: %.4s", mi4header.model);
/* Read binary type (RBOS, RBBL) */
printf("Binary type: %.4s", mi4header.type);
/* Load firmware */
storage_read_sectors(pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
+ (ppmi_header.length/512) + MI4_HEADER_SECTORS,
(mi4header.mi4size-MI4_HEADER_SIZE)/512, buf);
/* Check CRC32 to see if we have a valid file */
sum = chksum_crc32 (buf,mi4header.mi4size-MI4_HEADER_SIZE);
printf("Calculated CRC32: %x", sum);
if(sum != mi4header.crc32)
return EBAD_CHKSUM;
#ifdef SANSA_E200
if (disable_rebuild)
{
char block[512];
printf("Disabling database rebuild");
storage_read_sectors(pinfo->start + 0x3c08, 1, block);
block[0xe1] = 0;
storage_write_sectors(pinfo->start + 0x3c08, 1, block);
}
#else
(void) disable_rebuild;
#endif
return mi4header.mi4size-MI4_HEADER_SIZE;
}
void* main(void)
{
int i;
int btn;
int num_partitions;
int crc32;
char sector[512];
struct partinfo pinfo;
system_init();
kernel_init();
lcd_init();
font_init();
button_init();
i2c_init();
backlight_hw_on();
lcd_set_foreground(LCD_WHITE);
lcd_set_background(LCD_BLACK);
lcd_clear_display();
btn = button_read_device();
verbose = true;
lcd_setfont(FONT_SYSFIXED);
printf("Rockbox e200R installer");
printf("Version: %s", rbversion);
printf(MODEL_NAME);
printf("");
i=storage_init();
filesystem_init();
num_partitions = disk_mount_all();
if (num_partitions<=0)
{
error(EDISK, num_partitions, true);
}
disk_partinfo(1, &pinfo);
#if 0 /* not needed in release builds */
printf("--- Partition info ---");
printf("start: %x", pinfo.start);
printf("size: %x", pinfo.size);
printf("type: %x", pinfo.type);
printf("reading: %x", (START_SECTOR_OF_ROM + ROMSECTOR_TO_HACK)*512);
#endif
storage_read_sectors(pinfo.start + START_SECTOR_OF_ROM + ROMSECTOR_TO_HACK,
1 , sector);
crc32 = chksum_crc32 (sector, 512);
#if 0 /* not needed in release builds */
printf("--- Hack Status ---");
printf("Sector checksum: %x", crc32);
#endif
if (crc32 == PATCHED_CRC32)
{
/* Bootloader already patched */
printf("Already unlocked");
printf("Proceed to Step 2");
} else if ((crc32 == KNOWN_CRC32) &&
!memcmp(§or[HACK_OFFSET], knownBytes,
sizeof(knownBytes)/sizeof(*knownBytes)))
{
/* E200R bootloader detected - patch it */
memcpy(§or[HACK_OFFSET], changedBytes,
sizeof(changedBytes)/sizeof(*changedBytes));
storage_write_sectors(
pinfo.start + START_SECTOR_OF_ROM + ROMSECTOR_TO_HACK,
1 , sector);
printf("Firmware unlocked");
printf("Proceed to Step 2");
} else if (is_e200(crc32))
{
printf("Vanilla E200 detected!");
printf("Please install using");
printf("Sansapatcher");
}
else
{
printf("Unknown bootloader");
printf("Rockbox installer cannot");
printf("continue");
}
/* Turn button lights off */
GPIOG_OUTPUT_VAL &=~0x80;
printf("");
if (button_hold())
printf("Release Hold and");
printf("Press any key to shutdown");
while(button_read_device() == BUTTON_NONE);
power_off();
return NULL;
}
