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authorStefan Reinauer <reinauer@chromium.org>2011-10-14 15:24:03 -0700
committerStefan Reinauer <stefan.reinauer@coreboot.org>2011-10-17 17:51:52 +0200
commitd87dfc0c389563e4bac3c2726adce4f4800aad06 (patch)
treea414ca09c4f3286f010244e16be35d4057208a73 /src/pc80/mc146818rtc.c
parent1babddb202478c88813ee94911ee5576773e8d96 (diff)
Fix our CMOS checksum algorithm so it matches what /dev/nvram expects
Our cmos checksum is inverted to what the Linux /dev/nvram device expects (and BIOSes use). This makes it impossible to use /dev/nvram with coreboot. Fix it! Change-Id: I239f7e3aca05d3691aee16490dd801df2ccaefd1 Signed-off-by: Vadim Bendebury <vbendeb@google.com> Signed-off-by: Stefan Reinauer <reinauer@google.com> Reviewed-on: http://review.coreboot.org/279 Tested-by: build bot (Jenkins) Reviewed-by: Marc Jones <marcj303@gmail.com>
Diffstat (limited to 'src/pc80/mc146818rtc.c')
-rw-r--r--src/pc80/mc146818rtc.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/src/pc80/mc146818rtc.c b/src/pc80/mc146818rtc.c
index f3bee9bdce..034957acf5 100644
--- a/src/pc80/mc146818rtc.c
+++ b/src/pc80/mc146818rtc.c
@@ -98,7 +98,6 @@ static void rtc_set_checksum(int range_start, int range_end, int cks_loc)
for(i = range_start; i <= range_end; i++) {
sum += cmos_read(i);
}
- sum = ~(sum & 0x0ffff);
cmos_write(((sum >> 8) & 0x0ff), cks_loc);
cmos_write(((sum >> 0) & 0x0ff), cks_loc+1);
}