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.
