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

Area Name	SPI / UART			Syscall 863					Value Name	Description
	CXR713	CXR714	SW	Block ID	UM Whitelisted	SCM Whitelisted	Offset	Size
Industry Area a.k.a. OS Version Area	0x2F00-0x2FFF	0x2F00-0x2FFF	0xE00-0xEFF	0x10	Yes	Yes	0x02F00	0x08	Manufacturing Update Release Version String
					Yes	Yes	0x02F08	0x10	Manufacturing Update Build Version + Build Date String
					Yes	Yes	0x02F20	0x08	Manufacturing Update Build Target ID
					Yes	Yes	0x02F28	0xD0	Undocumented
					Yes	Yes	0x02FF8	0x01	Factory Bit
					Yes	Yes	0x02FF9	0x07	Undocumented