Raspberry Pi - 查詢樹莓派開發板版本

1. 查詢樹莓派開發板版本，有兩個方法。

2. 查詢/proc/device-tree/model
$ cat /proc/device-tree/model
Raspberry Pi 3 Model B Rev 1.2

3. 查詢/proc/cpuinfo，獲得Revision為a02082，查詢下表，得知此開發版為3B v1.2的版本。
$ cat /proc/cpuinfo

...
...
Hardware        : BCM2835
Revision        : a02082
Serial          : 0000000012345678

Old-style revision codes
====================================================
Code Model Revision RAM Manufacturer
0002 B 1.0 256 MB Egoman
0003 B 1.0 256 MB Egoman
0004 B 2.0 256 MB Sony UK
0005 B 2.0 256 MB Qisda
0006 B 2.0 256 MB Egoman
0007 A 2.0 256 MB Egoman
0008 A 2.0 256 MB Sony UK
0009 A 2.0 256 MB Qisda
000d B 2.0 512 MB Egoman
000e B 2.0 512 MB Sony UK
000f B 2.0 512 MB Egoman
0010 B+ 1.0 512 MB Sony UK
0011 CM1 1.0 512 MB Sony UK
0012 A+ 1.1 256 MB Sony UK
0013 B+ 1.2 512 MB Embest
0014 CM1 1.0 512 MB Embest
0015 A+ 1.1 256 MB / 512 MB Embest

New-style revision codes in use:
====================================================
Code Model Revision RAM Manufacturer
900021 A+ 1.1 512 MB Sony UK
900032 B+ 1.2 512 MB Sony UK
900092 Zero 1.2 512 MB Sony UK
900093 Zero 1.3 512 MB Sony UK
9000c1 Zero W 1.1 512 MB Sony UK
920093 Zero 1.3 512 MB Embest
a01040 2B 1.0 1 GB Sony UK
a01041 2B 1.1 1 GB Sony UK
a02082 3B 1.2 1 GB Sony UK
a020a0 CM3 1.0 1 GB Sony UK
a21041 2B 1.1 1 GB Embest
a22042 2B 1.2 1 GB Embest
a22082 3B 1.2 1 GB Embest
a32082 3B 1.2 1 GB Sony Japan

4. 參考來源
https://www.raspberrypi.org/documentation/hardware/raspberrypi/revision-codes/README.md