Revision of get_macbook_ramcfg

krisyotam revised this gist 1 month ago. Go to revision

1 file changed, 25 insertions, 23 deletions

get_macbook_ramcfg

			@@ -1,36 +1,38 @@
1	1		#!/usr/bin/env python3
	2	+	# =============================================================================
	3	+	# get_macbook_ramcfg
	4	+	# =============================================================================
2	5		#
3		-	# get_macbook_ramcfg
	6	+	# Decode Apple MacBook RAM configuration (RAMCFG) from Intel chipset GPIO
	7	+	# registers using output from `inteltool -g`.
4	8		#
5		-	# Decode Apple MacBook RAM configuration (RAMCFG) from Intel chipset GPIO
6		-	# registers using output from `inteltool -g`.
	9	+	# This script maps Apple’s undocumented GPIO-based RAM configuration
	10	+	# encoding to concrete memory vendor, size, and speed identifiers for
	11	+	# specific MacBook models.
7	12		#
8		-	# This script maps Apple’s undocumented GPIO-based RAM configuration
9		-	# encoding to concrete memory vendor, size, and speed identifiers for
10		-	# specific MacBook models.
	13	+	# USAGE
	14	+	# sudo inteltool -g \| get_macbook_ramcfg -m <MODEL>
11	15		#
12		-	# USAGE
13		-	# sudo inteltool -g \| get_macbook_ramcfg -m <MODEL>
	16	+	# SUPPORTED MODELS
	17	+	# mbp101 - MacBook Pro 10,1
	18	+	# mba52 - MacBook Air 5,2
	19	+	# mba42 - MacBook Air 4,2
14	20		#
15		-	# SUPPORTED MODELS
16		-	# mbp101 - MacBook Pro 10,1
17		-	# mba52 - MacBook Air 5,2
18		-	# mba42 - MacBook Air 4,2
	21	+	# NOTES
	22	+	# - Reads GPIO68–GPIO71 from the GPIO_LVL3 register
	23	+	# - Reverses bit order to match Apple’s wiring
	24	+	# - Uses RAMCFG value as an index into model-specific lookup tables
19	25		#
20		-	# NOTES
21		-	# - Reads GPIO68–GPIO71 from the GPIO_LVL3 register
22		-	# - Reverses bit order to match Apple’s wiring
23		-	# - Uses RAMCFG value as an index into model-specific lookup tables
	26	+	# CREDITS
	27	+	# Original implementation by ch1p (https://ch1p.io/)
24	28		#
25		-	# CREDITS
26		-	# Original implementation by ch1p (https://ch1p.io/)
	29	+	# LICENSE
	30	+	# BSD-2-Clause
27	31		#
28		-	# LICENSE
29		-	# BSD-2-Clause
30		-	#
31		-	# EXTENSIONS & MAINTENANCE
32		-	# Extended and maintained by Kris Yotam
	32	+	# EXTENSIONS & MAINTENANCE
	33	+	# Extended and maintained by Kris Yotam
33	34		#
	35	+	# =============================================================================
34	36
35	37		#!/usr/bin/env python3
36	38		import sys

krisyotam revised this gist 1 month ago. Go to revision

1 file changed, 131 insertions

get_macbook_ramcfg(file created)

		@@ -0,0 +1,131 @@
1	+	#!/usr/bin/env python3
2	+	#
3	+	# get_macbook_ramcfg
4	+	#
5	+	# Decode Apple MacBook RAM configuration (RAMCFG) from Intel chipset GPIO
6	+	# registers using output from `inteltool -g`.
7	+	#
8	+	# This script maps Apple’s undocumented GPIO-based RAM configuration
9	+	# encoding to concrete memory vendor, size, and speed identifiers for
10	+	# specific MacBook models.
11	+	#
12	+	# USAGE
13	+	# sudo inteltool -g \| get_macbook_ramcfg -m <MODEL>
14	+	#
15	+	# SUPPORTED MODELS
16	+	# mbp101 - MacBook Pro 10,1
17	+	# mba52 - MacBook Air 5,2
18	+	# mba42 - MacBook Air 4,2
19	+	#
20	+	# NOTES
21	+	# - Reads GPIO68–GPIO71 from the GPIO_LVL3 register
22	+	# - Reverses bit order to match Apple’s wiring
23	+	# - Uses RAMCFG value as an index into model-specific lookup tables
24	+	#
25	+	# CREDITS
26	+	# Original implementation by ch1p (https://ch1p.io/)
27	+	#
28	+	# LICENSE
29	+	# BSD-2-Clause
30	+	#
31	+	# EXTENSIONS & MAINTENANCE
32	+	# Extended and maintained by Kris Yotam
33	+	#
34	+
35	+	#!/usr/bin/env python3
36	+	import sys
37	+	import argparse
38	+
39	+
40	+	ramconfigs = {
41	+	'mba42': (
42	+	'2b_hynix',
43	+	None,
44	+	'4g_hynix',
45	+	None,
46	+	'2g_samsung',
47	+	None,
48	+	'4g_samsung',
49	+	None,
50	+	'2g_micron',
51	+	None,
52	+	None,
53	+	None,
54	+	None,
55	+	None,
56	+	'4g_elpida',
57	+	),
58	+	'mba52': (
59	+	'4g_hynix',
60	+	'4g_micron',
61	+	'8g_hynix',
62	+	None,
63	+	'4g_samsung',
64	+	None,
65	+	'8g_samsung',
66	+	None,
67	+	None,
68	+	None,
69	+	None,
70	+	None,
71	+	'4g_elpida',
72	+	None,
73	+	'8g_elpida',
74	+	),
75	+	'mbp101': (
76	+	'4g_hynix_1600s',
77	+	'1g_samsung_1600',
78	+	'4g_samsung_1600s',
79	+	'1g_hynix_1600',
80	+	'4g_elpida_1600s',
81	+	'2g_samsung_1600',
82	+	'2g_samsung_1333',
83	+	'2g_hynix_1600',
84	+	'4g_samsung_1600',
85	+	'4g_hynix_1600',
86	+	'2g_elpida_1600s',
87	+	'2g_elpida_1600',
88	+	'4g_elpida_1600',
89	+	'2g_samsung_1600s',
90	+	'2g_hynix_1600s'
91	+	)
92	+	}
93	+
94	+
95	+	def main():
96	+	parser = argparse.ArgumentParser()
97	+	parser.add_argument('-m', '--model',
98	+	choices=list(ramconfigs.keys()),
99	+	help='MacBook model',
100	+	required=True)
101	+
102	+	args = parser.parse_args()
103	+
104	+	configs = ramconfigs[args.model]
105	+
106	+	reg = None
107	+	for line in sys.stdin:
108	+	line = line.strip()
109	+	if not line.endswith('(GPIO_LVL3)'):
110	+	continue
111	+
112	+	reg = int(line.split(' ')[1], 16)
113	+	break
114	+
115	+	if reg is None:
116	+	raise Exceptions("failed to parse gpio registers")
117	+
118	+	# GPIO68..GPIO71
119	+	ramcfg = (reg >> 4) & 0xf
120	+
121	+	# reverse bit order
122	+	ramcfg = int('{:04b}'.format(ramcfg)[::-1], 2)
123	+
124	+	if ramcfg >= len(configs) or configs[ramcfg] is None:
125	+	print("unsupported memory configuration %d" % ramcfg)
126	+	else:
127	+	print("%s (RAMCFG=%01x)" % (configs[ramcfg], ramcfg))
128	+
129	+
130	+	if __name__ == '__main__':
131	+	main()

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