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Documentation: add sysfs entries for mtd docg3 chips 

Add documentation for MSystems disk-on-chip docg3 chips
sysfs entries, which enable and disable protection areas,
giving or disabling access to the chip's memory.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Robert Jarzmik 2011-11-29 23:16:35 +01:00 committed by David Woodhouse
parent b49e345e61
commit 1f9327fcff
1 changed files with 34 additions and 0 deletions
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What: /sys/devices/platform/docg3/f[0-3]_dps[01]_is_keylocked
Date: November 2011
KernelVersion: 3.3
Contact: Robert Jarzmik <robert.jarzmik@free.fr>
Description:
Show whether the floor (0 to 4), protection area (0 or 1) is
keylocked. Each docg3 chip (or floor) has 2 protection areas,
which can cover any part of it, block aligned, called DPS.
The protection has information embedded whether it blocks reads,
writes or both.
The result is:
0 -> the DPS is not keylocked
1 -> the DPS is keylocked
Users: None identified so far.
What: /sys/devices/platform/docg3/f[0-3]_dps[01]_protection_key
Date: November 2011
KernelVersion: 3.3
Contact: Robert Jarzmik <robert.jarzmik@free.fr>
Description:
Enter the protection key for the floor (0 to 4), protection area
(0 or 1). Each docg3 chip (or floor) has 2 protection areas,
which can cover any part of it, block aligned, called DPS.
The protection has information embedded whether it blocks reads,
writes or both.
The protection key is a string of 8 bytes (value 0-255).
Entering the correct value toggle the lock, and can be observed
through f[0-3]_dps[01]_is_keylocked.
Possible values are:
- 8 bytes
Typical values are:
- "00000000"
- "12345678"
Users: None identified so far.