Difference between revisions of "EEPROM"
KaosEngineer (talk | contribs) (→Contents: Corrections to a few entries, Checksum3 range, Standard Time zone bios, unknown region last 64 bytes (DO NOT modify content there)) |
KaosEngineer (talk | contribs) m (→Contents: there was an = should have been a ; for 0x88-0x8F offset standard time zone bias description) |
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| 0x88 | | 0x88 | ||
| 0x8B | | 0x8B | ||
| − | | Standard Timezone Bias | + | | Standard Timezone Bias; if DST=No, 0 (0x00000000) minute time adjust |
|- | |- | ||
| 0x8C | | 0x8C | ||
Revision as of 00:20, 27 August 2017
The Xbox EEPROM is a 256 byte non-volatile storage device which contains device-specific information. It is connected via I²C and located on address 0x54. Parts of the EEPROM are encrypted using Kernel/XboxEEPROMKey.
Contents
Chip Models
| Xbox Model | Manufacturer | Model |
|---|---|---|
| 1.4 (Others?) | Catalyst | CAT24WC02J |
Contents
| Start | End | Notes |
|---|---|---|
| 0x00 | 0x13 | HMAC_SHA1 Hash |
| 0x14 | 0x1B | RC4 Encrypted Confounder ?? |
| 0x1C | 0x2B | RC4 Encrypted HDD key |
| 0x2C | 0x2F | RC4 Encrypted Region code (0x01 North America, 0x02 Japan, 0x04 Europe) |
| 0x30 | 0x33 | Checksum2 - Checksum of next 44 bytes |
| 0x34 | 0x3F | Xbox serial number - (ASCII chars 0x30 - 0x39 to match each digit in SN) |
| 0x40 | 0x45 | Ethernet MAC address |
| 0x46 | 0x47 | Unknown Padding ? |
| 0x48 | 0x57 | Online Key ? |
| 0x58 | 0x5B | **Video Standard 0x00400100 = NTSC-M, 0x00400200 = NTSC-J, 0x00800300 = PAL |
| 0x5C | 0x5F | Unknown Padding ? |
| 0x60 | 0x63 | Checksum3 - Checksum of the next 92 bytes (0x64-0xBF) |
| 0x64 | 0x67 | Zone Bias - Offset in # minutes from GMT (0x0000168 = 360 = 6hr for GMT-06 Central) subtract value from GMT time |
| 0x68 | 0x6B | Standard timezone - NULL terminated length 3 string (e.g., CST\0) |
| 0x6C | 0x6F | Daylight timezone - NULL terminated length 3 string (e.g., CDT\0) |
| 0x70 | 0x77 | Unknown Padding ? |
| 0x78 | 0x7B | if DST=Yes, Standard Time Starts 10-05-00-02 (Month-Day-DayOfWeek-Hour); otherwise do not change time |
| 0x7C | 0x7F | if DST=Yes, Daylight Savings Time Starts 04-01-00-02 (Month-Day-DayOfWeek-Hour); otherwise do not change time |
| 0x80 | 0x87 | Unknown Padding ? |
| 0x88 | 0x8B | Standard Timezone Bias; if DST=No, 0 (0x00000000) minute time adjust |
| 0x8C | 0x8F | Daylight Savings Time Bias; if DST=Yes, -60 (0xFFFFFFC4) minute time adjust |
| 0x90 | 0x93 | Language ID |
| 0x94 | 0x97 | Video Settings Offset 0x96 value 0x4A? see 10 too = Normal, 0xB0=Widescreen and 0xB4=Letterbox |
| 0x98 | 0x9B | Audio Settings |
| 0x9C | 0x9F | Parental Control Games (0=MAX rating) |
| 0xA0 | 0xA3 | Parental Control Passcode - 4 button sequence - 7=X, 8=Y, B=LTrigger, C=RTrigger |
| 0xA4 | 0xA7 | Parental Control Movies (0=Max rating) |
| 0xA8 | 0xAB | XBOX Live IP Address.. |
| 0xAC | 0xAF | XBOX Live DNS Server.. |
| 0xB0 | 0xB3 | XBOX Live Gateway Address.. |
| 0xB4 | 0xB7 | XBOX Live Subnet Mask.. |
| 0xB8 | 0xBB | Other XBLive settings ? |
| 0xBC | 0xBF | DVD Playback Kit Zone |
| 0xC0 | 0xFF | Unknown Codes / History ? do not change any values in this region |
Note: Info in above table comes from XKUtils XKEEPROM.h.
Reading/Writing the EEPROM
Software Method
This is the easiest way to dump an Xbox EEPROM. Use your alternative dashboard to dump the EEPROM to a file and download it over FTP.
Hardware Method
If you cannot dump the EEPROM using software, you can dump it using hardware. You have several options: use an I2C host adapter (see here or here), build an I2C-Serial cable, or use a device like a RaspberryPi which has an I2C interface. Connect SDA/SCL/ground to the LPC pinout on the board. See here for pinout information. Then use the corresponding software to read/write the EEPROM.
The HMAC HDD Key
The HMAC HDD Key is generated out of the first 48 bytes. This section has been identified clearly.
The Region Code
This DWORD is encrypted. It corresponds to the region code in the XBE header:
| 1 | North America |
| 2 | Japan |
| 4 | Europe/Australia |
| 0x80000000 | Manufacturing plant |
The Serial Number
1166356 20903
|| | |||||__
|| | ||||___ factory number
|| | |||____
|| | ||_____ week of year (starting Mondays)
|| | |______ last digit of year
|| |________
||_____________ number of Xbox within week and factory
|______________ production line within factory
| 1 | 1 | 6 | 6 | 3 | 5 | 6 | 2 | 0 | 9 | 0 | 3 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| | | \ | _ | _ | _ | _ | / | | | | | | | \ | \ | _ | Factory Number (02=Mexico, 03=Hungary, 05=China, 06=Taiwan) | |
| | | | | | | | | | | | | |||||||||
| | | | | | | | | \ | \ | _ | _ | _ | week of year (starting Mondays) | |||||
| | | | | | | | | |||||||||||
| | | | | | | \ | _ | _ | _ | _ | _ | last digit of year (200Y) | |||||
| | | | | | | ||||||||||||
| | | \ | \ | _ | _ | _ | _ | _ | _ | _ | _ | _ | number of Xbox within week and factory | ||
| | | ||||||||||||||
| \ | _ | _ | _ | _ | _ | _ | _ | _ | _ | _ | _ | _ | _ | production line within factory |
The MAC address
This is the MAC address of the Ethernet hardware, which has been issued by the IEEE.
DVD Region
This DWORD corresponds to the region code for playback of DVD movies:
| 0x00 | None |
| 0x01 | Region 1 |
| ... | ... |
| 0x06 | Region 6 |
Checksum Algorithm
Checksum2 and Checksum3 values can be calculated by running the following code snippet over the area the checksum covers:
/* The EepromCRC algorithm was obtained from the XKUtils 0.2 source released by
* TeamAssembly under the GNU GPL.
* Specifically, from XKCRC.cpp
*
* Rewritten to ANSI C by David Pye (dmp@davidmpye.dyndns.org)
*
* Thanks! */
void EepromCRC(unsigned char *crc, unsigned char *data, long dataLen) {
unsigned char* CRC_Data = (unsigned char *)malloc(dataLen+4);
int pos=0;
memset(crc,0x00,4);
memset(CRC_Data,0x00, dataLen+4);
//Circle shift input data one byte right
memcpy(CRC_Data + 0x01 , data, dataLen-1);
memcpy(CRC_Data, data + dataLen-1, 0x01);
for (pos=0; pos<4; ++pos) {
unsigned short CRCPosVal = 0xFFFF;
unsigned long l;
for (l=pos; l<dataLen; l+=4) {
CRCPosVal -= *(unsigned short*)(&CRC_Data[l]);
}
CRCPosVal &= 0xFF00;
crc[pos] = (unsigned char) (CRCPosVal >> 8);
}
free(CRC_Data);
}
