Messages in this thread | | | Date | Thu, 29 Jul 1999 12:57:35 +0200 | From | Philipp Rumpf <> | Subject | Re: PATCH: /dev/nvram cleanups. |
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> Why is there a 50 byte limit on nvram? Everything until the checksum and > 2 additional bytes? Why not address the full 128 bytes?
Some RTCs implement only 64 bytes of NVRAM, with bytes 64-127 mapping back to 0-63. That way, you could not only write the NVRAM, but make the RTC generate interrupts (which we use as timer interrupts on some Alphas), set the system time or cause alarms as soon as you'd have write access to the NVRAM. AFAIK there is no way to autodetect the size of the NVRAM.
Philipp Rumpf
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