rtc-cmos: export second NVRAM bank
commitc8fc40cd345bfd88d8a98e7916909b9143502999
authorDavid Brownell <dbrownell@users.sourceforge.net>
Sun, 19 Oct 2008 03:27:47 +0000 (18 20:27 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 20 Oct 2008 15:52:36 +0000 (20 08:52 -0700)
treea0c43296bd7d5242a1f34a153edb76c42ce8686d
parent1f3ccaed13944b9cfa9af7f6c70bfb292e42a347
rtc-cmos: export second NVRAM bank

Teach rtc-cmos about the second bank of registers found on most modern x86
systems, giving access to 128 bytes more NVRAM.

This version only sees that extra NVRAM when both register banks are
provided as part of *one* PNP resource.  Since BIOS on some systems
presents them using two IO resources, and nothing merges them, this can't
always show all the NVRAM.  (We're supposed to be able to use PNP id
PNP0b01 too, but BIOS tables doesn't often seem to use that particular
option.)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/rtc/rtc-cmos.c