krisyotam / get_macbook_ramcfg

#!/usr/bin/env python3 # ============================================================================= # get_macbook_ramcfg # ============================================================================= # # Decode Apple MacBook RAM configuration (RAMCFG) from Intel chipset GPIO # registers using output from `inteltool -g`. # # This script maps Apple’s undocumented GPIO-based RAM configuration # encoding to concrete memory vendor, size, and speed identifiers for # specific MacBook models. # # USAGE # sudo inteltool -g | get_macbook_ramcfg -m <MODEL> # # SUPPORTED MODELS # mbp101 - MacBook Pro 10,1 # mba52 - MacBook Air 5,2 # mba42 - MacBook Air 4,2 # # NOTES # - Reads GPIO68–GPIO71 from the GPIO_LVL3 register # - Reverses bit order to match Apple’s wiring # - Uses RAMCFG value as an index into model-specific lookup tables # # CREDITS # Original implementation by ch1p (https://ch1p.io/) # # LICENSE # BSD-2-Clause # # EXTENSIONS & MAINTENANCE # Extended and maintained by Kris Yotam # # ============================================================================= #!/usr/bin/env python3 import sys import argparse ramconfigs = { 'mba42': ( '2b_hynix', None, '4g_hynix', None, '2g_samsung', None, '4g_samsung', None, '2g_micron', None, None, None, None, None, '4g_elpida', ), 'mba52': ( '4g_hynix', '4g_micron', '8g_hynix', None, '4g_samsung', None, '8g_samsung', None, None, None, None, None, '4g_elpida', None, '8g_elpida', ), 'mbp101': ( '4g_hynix_1600s', '1g_samsung_1600', '4g_samsung_1600s', '1g_hynix_1600', '4g_elpida_1600s', '2g_samsung_1600', '2g_samsung_1333', '2g_hynix_1600', '4g_samsung_1600', '4g_hynix_1600', '2g_elpida_1600s', '2g_elpida_1600', '4g_elpida_1600', '2g_samsung_1600s', '2g_hynix_1600s' ) } def main(): parser = argparse.ArgumentParser() parser.add_argument('-m', '--model', choices=list(ramconfigs.keys()), help='MacBook model', required=True) args = parser.parse_args() configs = ramconfigs[args.model] reg = None for line in sys.stdin: line = line.strip() if not line.endswith('(GPIO_LVL3)'): continue reg = int(line.split(' ')[1], 16) break if reg is None: raise Exceptions("failed to parse gpio registers") # GPIO68..GPIO71 ramcfg = (reg >> 4) & 0xf # reverse bit order ramcfg = int('{:04b}'.format(ramcfg)[::-1], 2) if ramcfg >= len(configs) or configs[ramcfg] is None: print("unsupported memory configuration %d" % ramcfg) else: print("%s (RAMCFG=%01x)" % (configs[ramcfg], ramcfg)) if __name__ == '__main__': main()