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	0x18	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	csum	Mullion		Sherwood	whitelist	Block ID NVS Region	whitelist			Offset	Size
			CXR713	CXR714	SW/2/3	EEP		DM	UM	SCM
System Info	0x200	No	0x2600	0x2600	?	?	?	?	?	?	?	0x200		Encrypted region
Patch 1	0x400	No	0x2800	0x2800	0x2000 ?	Exploit	N/A	No	No	No	0x02800	0x400	Syscon Firmware Patch (top half)	Encrypted region
-	0x300	No	0x2C00	0x2C00	?	?	N/A	No	No	No	0x02C00	0x300	empty	Region not used
Industry Area	0x100	No	0x2F00	0x2F00	0xE00	Yes	0x10	Patch	Yes	Yes	0x02F00	0x08	Manufacturing Update Release Version	e.g: 04.6000
											0x02F08	0x18	Manufacturing Update Build Version + Build Date	e.g: 63910,20140618
											0x02F20	0x08	Manufacturing Update Build Target ID	Written during the manufacturing fw update process according to target string inside /dev_flash/vsh/etc/version.txt 0x83 = CEX-ww 0x82 = DEX-ww 0x81 = DevelopmentTool 0xDEAD = ?
											0x02F28	0xD0	Undocumented
											0x02FF8	0x01	Factory Bit	0 = ? 1 = Reset 2 = ? 3 = ? (used on retails)
											0x02FF9	0x07	Undocumented
Thermal Config	0x200	Yes	0x3300	0x3300	0x250	Yes	?	?	?	?	?	0x200	Data table using this C structure	See: Syscon Thermal Config
On/Off Count/Time	0x200	No	0x3500	0x3500	?	Yes	?	?	?	?	?	0x200	Data table
Error Log	0x100	No	0x3700	0x3700	0x900	Yes	?	?	?	?	?	0x100	Data table	See: Syscon Error Codes
Flags and Tokens	0x100	No	0x7200	0x4200	0x1200	Yes	0x02	Patch	Yes	Yes	0x48C00	0x01	OS boot order flag	load_image_in_rom (os_boot_order_flag) 0 = Network first 1 = Flash first
								Patch	Patch	Yes	0x48C01	0x01	sys.dbgcard.hostpc	force standalone mode related
								Patch	Yes	Yes	0x48C02	0x01	Network Debug Interface Mode	sys.dbgcard.dgbe / debug interface (select_net_device) -1 = Ethernet 2  0 = IFB  1 = CP  2 = SB UART  3 = CP ch4  5 = Disabled
Patch 2	0xC00	No	0x7400	0x4400	0x2400 ?	Exploit	N/A	No	No	No	?	?	Syscon Firmware Patch (bottom half)	Encrypted region