| Oliver Schinagl | 9fd379e | 2013-09-03 12:33:27 +0200 | [diff] [blame] | 1 | What: /sys/devices/*/<our-device>/eeprom |
| 2 | Date: August 2013 |
| 3 | Contact: Oliver Schinagl <oliver@schinagl.nl> |
| 4 | Description: read-only access to the SID (Security-ID) on current |
| 5 | A-series SoC's from Allwinner. Currently supports A10, A10s, A13 |
| 6 | and A20 CPU's. The earlier A1x series of SoCs exports 16 bytes, |
| 7 | whereas the newer A20 SoC exposes 512 bytes split into sections. |
| 8 | Besides the 16 bytes of SID, there's also an SJTAG area, |
| 9 | HDMI-HDCP key and some custom keys. Below a quick overview, for |
| 10 | details see the user manual: |
| 11 | 0x000 128 bit root-key (sun[457]i) |
| 12 | 0x010 128 bit boot-key (sun7i) |
| 13 | 0x020 64 bit security-jtag-key (sun7i) |
| 14 | 0x028 16 bit key configuration (sun7i) |
| 15 | 0x02b 16 bit custom-vendor-key (sun7i) |
| 16 | 0x02c 320 bit low general key (sun7i) |
| 17 | 0x040 32 bit read-control access (sun7i) |
| 18 | 0x064 224 bit low general key (sun7i) |
| 19 | 0x080 2304 bit HDCP-key (sun7i) |
| 20 | 0x1a0 768 bit high general key (sun7i) |
| 21 | Users: any user space application which wants to read the SID on |
| 22 | Allwinner's A-series of CPU's. |