NAND

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NAND Flash with 16Mx8bit and spare 4M bit capacity

Flash memory

Nandpinout.png

Attached to Southbridge

NAND Points on Motherboard for FAT

Nandreadpins.jpg

NAND Points on Motherboard for SLIM

comming soon

Different Sizes

On different Motherboard Revision also different NANDs were used. Xenon-, Zephyr-, Falcon-, Opus- and some Jasper-Consoles (Retails) are using 16MB NANDs, other Jasper-Consoles (Retail),Arcade Bundles which came without a HDD, got a 256MB or 512MB NAND onboard. Only 64MB of these 256/512MB NAND are used for system files, the rest is used as an internal Memory Unit. All Development-/Demo-/Reviewer-/Test-Kits got at least a 64MB NAND. Depending on the NAND Size either Small- or Large-Block Flash Controllers get used.

Flash Controllers

The Flash Controller decides how to handle the NAND Memory. There are currently two types, the Old/Original SFC which handles the NAND with small block and the new SFC (Codename: Panda?) which handles the NAND as either small or large blocks.

Original SFC (pre-Jasper)

  • 16MB NAND
Type Size
Block Size 0x4000 (16KB)
Block Count 0x400
Page Size 0x200
Pages per Block Block size / Page size
Raw Page Size (incl. SpareData) 0x210
Usable Filesystem-Size 0x3E0
  • 64MB NAND
Type Size
Block Size 0x4000 (16KB)
Block Count 0x1000
Page Size 0x200
Pages per Block Block size / Page size
Raw Page Size (incl. SpareData) 0x210
Usable Filesystem-Size 0xF80


New SFC

  • Small Block: 16MB NAND
Type Size
Block Size 0x4000 (16KB)
Block Count 0x400
Page Size 0x200
Pages per Block Block size / Page size
Raw Page Size (incl. SpareData) 0x210
Usable Filesystem-Size 0x3E0
  • Large Block: 256/512MB NAND
Type Size
Block Size 0x20000 (128KB)
Block Count (non-MU) 0x1000
Page Size 0x200
Pages per Block Block size / Page size
Raw Page Size (incl. SpareData) 0x210
Usable Filesystem-Size 0x1E0

Simple Calculations

Have an address which is without ECC?

realaddr = (addr / 512) * 528 + (realaddr % (mod) 512 > 0 ? realaddr % (mod) 512 : 0);

This also works in reverse:

addr = (realaddr / 528) * 512 + (realaddr % (mod) 528 > 0 ? realaddr % (mod) 528 : 0);

Reading/Writing

The Flash can be written or read using a number of methods. If you have the old shader hack running the easiest is using lflash. You can also wire LPT directly to the flash using this diagram. As well, you can build your own USB SPI Flasher with this diagram and use these binaries. Flash the PicXboot.hex to your PIC, then use the programmer from this picflash to flash the picflash.hex to the PIC through USB in bootloader mode. Once the device is flashed, you can then install it using the drivers from NandPro or use TeamXecuters NANDX drivers.

Once wired you can read/write to the chip using software such as NandPro.

Sectors

  • 1: copyright notice, zeros, unencrypted numbers
  • 2: encrypted data

@2MB filesystem, unencrypted, but content encrypted, config not

NAND File System

Informations about the Filesystem on the Xbox360 NAND Flash can be found here

Bad Blocks

Its possible that bad blocks appears when reading/writing to the NAND. For solving these look at the following page: Bad Blocks

Small flash chip close to CPU

Some 360s have a small flash chip near the CPU, some don't as seen in the following pictures.

No chip:

X360Pro noeeprom.jpg

Here is a high-res picture of a premium box with the chip:

Eeprom.jpg

As discussed in this article on the xboxhacker.net forums, this appears to be a Atmel 25020 EEPROM. The chip model reads:

ATMEL524
25020AN
SU18

Datasheet can be found here.

This chip is a low power 2048 bit serial EEPROM according to the datasheet.

  • If the small chip near the CPU is removed the Xbox will boot up and function just fine [Darkmoon 360 experiments]
  • According to IBM the CPU has "An interface for a serial EEPROM in case patch logic configuration was needed during bring-up"

Small flash chip on front panel

There is another Atmel chip on the front panel:

File:Atmel2.jpg

Atmel 528 serial EEPROM

This chip reads:

ATMEL528
24C04N
SU18

Datasheet can be found here

This chip is a low power 4096 bit serial EEPROM according to the datasheet.

Tools

360 Flash Tool, which is easy to find
Xbox 360 NAND Editor by stoker25, open source and semi-complete, has code to do with bootloaders/keyvault/filesystem