1 What: /sys/devices/*/<our-device>/nv 1 What: /sys/devices/*/<our-device>/nvmem
2 Date: December 2017 2 Date: December 2017
3 Contact: PrasannaKumar Muralidharan <pra 3 Contact: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com>
4 Description: read-only access to the efuse 4 Description: read-only access to the efuse on the Ingenic JZ4780 SoC
5 The SoC has a one time program 5 The SoC has a one time programmable 8K efuse that is
6 split into segments. The drive 6 split into segments. The driver supports read only.
7 The segments are: !! 7 The segments are
8 <<
9 ===== ======== =============== <<
10 0x000 64 bit Random Number 8 0x000 64 bit Random Number
11 0x008 128 bit Ingenic Chip ID 9 0x008 128 bit Ingenic Chip ID
12 0x018 128 bit Customer ID 10 0x018 128 bit Customer ID
13 0x028 3520 bit Reserved 11 0x028 3520 bit Reserved
14 0x1E0 8 bit Protect Segment 12 0x1E0 8 bit Protect Segment
15 0x1E1 2296 bit HDMI Key 13 0x1E1 2296 bit HDMI Key
16 0x300 2048 bit Security boot k 14 0x300 2048 bit Security boot key
17 ===== ======== =============== <<
18 <<
19 Users: any user space application whi 15 Users: any user space application which wants to read the Chip
20 and Customer ID 16 and Customer ID
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