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>
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@ -98,7 +98,6 @@ static void rtc_set_checksum(int range_start, int range_end, int cks_loc)
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for(i = range_start; i <= range_end; i++) {
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sum += cmos_read(i);
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}
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sum = ~(sum & 0x0ffff);
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cmos_write(((sum >> 8) & 0x0ff), cks_loc);
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cmos_write(((sum >> 0) & 0x0ff), cks_loc+1);
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}
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