diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/Kconfig | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index ce9979529cf3..72866a004f07 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -244,25 +244,24 @@ source "drivers/char/hw_random/Kconfig" config NVRAM tristate "/dev/nvram support" - depends on X86 || GENERIC_NVRAM || HAVE_ARCH_NVRAM_OPS - default M68K + depends on X86 || HAVE_ARCH_NVRAM_OPS + default M68K || PPC ---help--- 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 extra bytes of non-volatile - memory in the real time clock (RTC), which is contained in every PC - and most Ataris. The actual number of bytes varies, depending on the - nvram in the system, but is usually 114 (128-14 for the RTC). - - 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 + 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. |