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The Linux kernel configuration item CONFIG_NVRAM
has multiple definitions:
drivers/char/Kconfig
The configuration item CONFIG_NVRAM:
CONFIG_X86 || CONFIG_HAVE_ARCH_NVRAM_OPS
chrp_nvram
, nvram
, pmac_nvram
If you say Y here and create a character special file /dev/nvram with major number 10 and minor number 144 using mknod ("man mknod"), you get read and write access to the non-volatile memory.
/dev/nvram may be used to view settings in NVRAM or to change them (with some utility). It could also be used to frequently save a few bits of very important data that may not be lost over power-off and for which writing to disk is too insecure. Note however that most NVRAM space in a PC belongs to the BIOS and you should NEVER idly tamper with it. See Ralf Brown's interrupt list for a guide to the use of CMOS bytes by your BIOS.
This memory is conventionally called "NVRAM" on PowerPC machines, "CMOS RAM" on PCs, "NVRAM" on Ataris and "PRAM" on Macintoshes.
To compile this driver as a module, choose M here: the module will be called nvram.
arch/m68k/Kconfig
The configuration item CONFIG_NVRAM:
CONFIG_ATARI
chrp_nvram
, nvram
, pmac_nvram
If you say Y here and create a character special file /dev/nvram with major number 10 and minor number 144 using mknod ("man mknod"), you get read and write access to the 50 bytes of non-volatile memory in the real time clock (RTC), which is contained in every PC and most Ataris.
This memory is conventionally called "CMOS RAM" on PCs and "NVRAM" on Ataris. /dev/nvram may be used to view settings there, or to change them (with some utility). It could also be used to frequently save a few bits of very important data that may not be lost over power-off and for which writing to disk is too insecure. Note however that most NVRAM space in a PC belongs to the BIOS and you should NEVER idly tamper with it. See Ralf Brown's interrupt list for a guide to the use of CMOS bytes by your BIOS.
On Atari machines, /dev/nvram is always configured and does not need to be selected.
To compile this driver as a module, choose M here: the module will be called nvram.
Raw data from LKDDb:
lkddb module chrp_nvram CONFIG_NVRAM : drivers/char/Kconfig : "/dev/nvram support" # in 2.6.16
lkddb module nvram CONFIG_NVRAM : drivers/char/Kconfig : "/dev/nvram support" # in 2.6.17–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.10, 6.11-rc+HEAD
lkddb module pmac_nvram CONFIG_NVRAM : drivers/char/Kconfig : "/dev/nvram support" # in 2.5.45–2.5.75, 2.6.0–2.6.15
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Automatically generated (in year 2024). See also LKDDb sources on GitLab