Talk:SC EEPROM

Memory test diagnosis NVS flag

There is a NVS flag which enables a special diagnostic mode at startup. This flag is enabled on Proto/DECR. It allows memtest diagnose.

Pseudo-code:

def check_bootrom_diag_mode(mode, param)
        diag_mode = get_eeprom_bootrom_diag()
        if diag_mode & 0x1:
                if diag_mode & 0x100:
                        return 0
                mode = (diag_mode >> 3) & 0x1
                param = (diag_mode >> 3) & 0x1
        else:
                mode = (diag_mode >> 1) & 0x1
                param = -1
        return 1

EEPROM Dumps

• https://mega.co.nz/#!Bk1ESBZT!pqAB6riHhZSCPAftvjm2MFf3j0It61huT3WT2AbWS-A -> DEAD LINK

EEPROM Strings (CP memory dump, DECR)

http://pastie.org/private/usd2zi8mw3igycsh1a395q -> DEAD LINK

Bus Pirate stuff

http://i.imgur.com/48rbR51.png

(needs more wikifying)

On standby

• Note: during this time the plaintext EEPROM is never read even once!
• Additionally, the areas 0x26B0, 0x26D0 are not read

• Checks status
• Unlocks Write Command
• Reads PATCH top half region
• Reads PATCH bottom half region
• Reads 0x2790?(0x20)
• Reads 0x27B0?(0x10)
• Reads 0x26D0 (0x10)
• Reads some configs? (around >0x31XX area)
• Reads 0x0 (0x10)
• Reads some configs?
• Reads 0x10(0x280) (EID1)?
• Reads 0x3A00 (0x1)
• Reads 0x290 (0x10) (EID1 CMAC?)
• Reads 0x2A0 (0x20)
• Reads 0x2C0 (0x20)
• Reads 0x2E0 (0x20)
• Writes some stuff to 0x2C0/0x2E0/0x2A0 (mostly ff's)
• ReReads EID1 and CMAC
• Reads 0x360
• Reads 0x370
• Writes (again) mostly ff's to 0x360 and 0x370
• ReReads EID1 and CMAC
• Does same process with 0x460 and 0x470
• Reads 0x2710 and 0x2730 (0x20,0x10) ???
• Reads 0x2700 (0x10)
• fini!

MemoryMap Syscon BB Chip

0x1000-0x1FFF:PTCH Region (patch written here)

Nice read about Syscon EEPROM

http://rmscrypt.wordpress.com/2011/02/01/lets-look-at-syscon/

Experimental table

The goal is to join together all the "memory map" info in a single table

UART			Syscall 863					Area Name	Value Name	Description
CXR713	CXR714	SW	UM Whilisted	SM Whitelisted	Block ID	Offset	Size
						0x02F00	0x08		Manufacturing Update Release Version String
						0x02F08	0x10		Manufacturing Update Build Version + Build Date String
						0x02F20	0x08		Manufacturing Update Build Target ID
						0x02F28	0xD0		Undocumented
						0x02FF8	0x01		Factory Bit
						0x02FF9	0x07		Undocumented