Talk:SC EEPROM

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There is a flag at EEPROM which enables a special diagnostic mode at startup.
Note: 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

EEPROM Strings (CP memory dump, DECR)

http://pastie.org/private/usd2zi8mw3igycsh1a395q

Bus Pirate stuff

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

(needs more wikifying)

On standby

  • Note: during this time the plaintext eprom 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 0x2700 (0x10)