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What: /sys/bus/nvmem/devices/.../force_ro
Date: June 2024
KernelVersion: 6.11
Contact: Marek Vasut <marex@denx.de>
Description:
This read/write attribute allows users to set read-write
devices as read-only and back to read-write from userspace.
This can be used to unlock and relock write-protection of
devices which are generally locked, except during sporadic
programming operation.
Read returns '0' or '1' for read-write or read-only modes
respectively.
Write parses one of 'YyTt1NnFf0', or [oO][NnFf] for "on"
and "off", i.e. what kstrtobool() supports.
Note: This file is only present if CONFIG_NVMEM_SYSFS
is enabled.
What: /sys/bus/nvmem/devices/.../nvmem
Date: July 2015
KernelVersion: 4.2
Contact: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Description:
This file allows user to read/write the raw NVMEM contents.
Permissions for write to this file depends on the nvmem
provider configuration.
Note: This file is only present if CONFIG_NVMEM_SYSFS
is enabled
ex::
hexdump /sys/bus/nvmem/devices/qfprom0/nvmem
0000000 0000 0000 0000 0000 0000 0000 0000 0000
*
00000a0 db10 2240 0000 e000 0c00 0c00 0000 0c00
0000000 0000 0000 0000 0000 0000 0000 0000 0000
...
*
0001000
What: /sys/bus/nvmem/devices/.../type
Date: November 2018
KernelVersion: 5.0
Contact: Alexandre Belloni <alexandre.belloni@bootlin.com>
Description:
This read-only attribute allows user to read the NVMEM
device type. Supported types are "Unknown", "EEPROM",
"OTP", "Battery backed", "FRAM".
Note: This file is only present if CONFIG_NVMEM_SYSFS
is enabled.
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