blob: 6fee53da70c5f6d73ef3778625ad6a89b30032f7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style type="text/css">
@import url('../css/main.css');
</style>
<title>ThinkPad T500</title>
</head>
<body>
<div class="section">
<h1 id="pagetop">ThinkPad T500</h1>
<p>
It is believed that all or most T500 laptops are compatible.
See notes about <a href="../install/t500_external.html#cpu_compatibility">CPU compatibility</a>
and <a href="../install/t500_external.html#switchable_graphics">switchable graphics</a> for
potential incompatibilities.
</p>
<p>
There are two possible flash chip sizes for the R400: 4MiB (32Mbit) or 8MiB (64Mbit).
This can be identified by the type of flash chip below the palmrest: 4MiB is SOIC-8, 8MiB
is SOIC-16.
</p>
<p>
<b>The T500 laptops come with the ME (and sometimes AMT in addition) before flashing libreboot. Libreboot disables and removes it
by using a modified descriptor: see <a href="gm45_remove_me.html">gm45_remove_me.html</a></b> (contains notes, plus
instructions)
</p>
<p>
Flashing instructions can be found at <a href="../install/index.html#flashrom">../install/index.html#flashrom</a>
</p>
<p>
<a href="index.html">Back to previous index</a>.
</p>
</div>
<div class="section">
<p>
Thi T500 is almost identical to the X200, code-wise. See <a href="x200.html">x200.html</a>.
</p>
</div>
<div class="section">
<h2 id="descriptor_difference">
Descriptor and Gbe differences
</h2>
<p>
See
<a href="../future/dumps/t500_x200_descriptor/descriptor_diff_t500_x200.txt">../future/dumps/t500_x200_descriptor/descriptor_diff_t500_x200.txt</a>
and
<a href="../future/dumps/t500_x200_descriptor/gbe_diff_t500_x200.txt">../future/dumps/t500_x200_descriptor/gbe_diff_t500_x200.txt</a>
</p>
<p>
The patches above are based on the output from ich9deblob on a factory.rom image dumped from the T500
with a SOIC-8 4MiB flash chip. The patch re-creates the X200 descriptor/gbe source, so the commands were
something like:<br/>
$ <b>diff -u t500gbe x200gbe</b><br/>
$ <b>diff -u t500descriptor x200descriptor</b>
</p>
<p>
ME VSCC table is in a different place and a different size on the T500. Libreboot disables and removes the ME
anyway, so it doesn't matter.
</p>
<p>
The very same descriptor/gbe used on the X200 (generated by <a href="gm45_remove_me.html#ich9gen">ich9gen</a>)
was re-used on the T500, and it still worked.
</p>
</div>
<div class="section">
<h2 id="regdumps">Hardware register dumps</h2>
<p>
The coreboot wiki <a href="http://www.coreboot.org/Motherboard_Porting_Guide">shows</a>
how to collect various logs useful in porting to new
boards. Following are outputs from the T500:
</p>
<ul>
<li>
T500 with <b>TODO: PUT FLASH CHIP HERE</b> flash chip (4MiB, SOIC-8)
and <b>TODO: PUT BIOS/EC VERSION HERE</b>:
<ul>
<li>TODO: put logs here</li>
</ul>
</li>
<li>
Version of flashrom used for the external flashing/reading logs is the one that libreboot git revision c164960 uses.
</li>
</ul>
</div>
<div class="section">
<p>
Copyright © 2015 Francis Rowe <info@gluglug.org.uk><br/>
This document is released under the Creative Commons Attribution-ShareAlike 4.0 International Public License and all future versions.
A copy of the license can be found at <a href="../license.txt">../license.txt</a>.
</p>
<p>
This document is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See <a href="../license.txt">../license.txt</a> for more information.
</p>
</div>
</body>
</html>
|
