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

Round 1

Area		SPI / UART				Syscall 863								Data Name	Notes
Name	Size	Mullion		Sherwood	EEP whitelist	NVS ID	Block ID	UM whitelist		SCM whitelist		Offset	Size
		CXR713	CXR714	SW/2/3				Read	Write	Read	Write
Patch Part 1	0x400	0x2800	0x2800	?	No*	N/A	N/A	No	No	No	No	0x02800	0x400	Syscon Firmware Patch (top half)
OS Version Area a.k.a. Industry Area	0x100	0x2F00	0x2F00	0xE00	Yes	0x20	0x10	Yes	No	Yes	No	0x02F00	0x08	Manufacturing Update Release Version
								Yes	No	Yes	No	0x02F08	0x10	Manufacturing Update Build Version + Build Date
								Yes	No	Yes	No	0x02F20	0x08	Manufacturing Update Build Target ID
								Yes	No	Yes	No	0x02F28	0xD0	Undocumented
								Yes	No	Yes	No	0x02FF8	0x01	Factory Bit
								Yes	No	Yes	No	0x02FF9	0x07	Undocumented

Round 2

Area		SPI / UART				Syscall 863					Data Name	Notes
Name	Size	Mullion		Sherwood	whitelist	Block ID NVS Region	whitelist		Offset	Size
		CXR713	CXR714	SW/2/3	EEP		UM	SCM
Patch Part 1	0x400	0x2800	0x2800	0x2000 ?	No*	N/A	No	No	0x02800	0x400	Syscon Firmware Patch (top half)
OS Version Area a.k.a. Industry Area	0x100	0x2F00	0x2F00	0xE00	Yes	0x10	Yes	Yes	0x02F00	0x08	Manufacturing Update Release Version
									0x02F08	0x10	Manufacturing Update Build Version + Build Date
									0x02F20	0x08	Manufacturing Update Build Target ID
									0x02F28	0xD0	Undocumented
									0x02FF8	0x01	Factory Bit
									0x02FF9	0x07	Undocumented
Flags and Tokens	0x100	0x7200	0x4200	0x1200	Yes	0x02	Yes	Yes	0x48C00	0x01	boot flag	load_image_in_rom flag (os_boot_order_flag) 0 = network first 1 = flash first
							No	Yes	0x48C01	0x01	sys.dbgcard.hostpc	force standalone mode related
							Yes	Yes	0x48C02	0x01	Network Device Mode	sys.dbgcard.dgbe / debug interface (select_net_device) -1 = Ethernet 2 0 = IFB 1 = CP 2 = SB UART 3 = CP ch4 5 = invalid