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authorRobert Jarzmik <robert.jarzmik@free.fr>2011-11-29 23:16:35 +0100
committerDavid Woodhouse <David.Woodhouse@intel.com>2012-01-09 18:12:17 +0000
commit1f9327fcffdac27e7b100b3a392291a7b94c97fd (patch)
treeb2bdc5ebc42b7cdd2b65c185e4b2bf9b0ecb63aa /Documentation/ABI/testing/sysfs-devices-platform-docg3
parentb49e345e61a2e0c4decbe9b1bd670ed5599fac6e (diff)
downloadlinux-1f9327fcffdac27e7b100b3a392291a7b94c97fd.tar.bz2
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>
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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.