[coreboot] [PATCH] libpayload: fix cmos checksum.

[Stefan Reinauer]

See patch.

libpayload: Add function to fix CMOS checksum.

Signed-off-by: Stefan Reinauer <ste...@coresystems.de>

Index: include/libpayload.h
===================================================================
--- include/libpayload.h        (revision 5606)
+++ include/libpayload.h        (working copy)
@@ -190,6 +190,7 @@
 /** @} */
 
 /* drivers/option.c */
+void fix_options_checksum(void);
 int get_option(void *dest, char *name);
 
 /**
Index: drivers/options.c
===================================================================
--- drivers/options.c   (revision 5606)
+++ drivers/options.c   (working copy)
@@ -48,6 +48,23 @@
        return (checksum_old == checksum);
 }
 
+void fix_options_checksum(void)
+{
+       int i;
+       int range_start = lib_sysinfo.cmos_range_start / 8;
+       int range_end = lib_sysinfo.cmos_range_end / 8;
+       int checksum_location = lib_sysinfo.cmos_checksum_location / 8;
+       u16 checksum = 0;
+
+       for(i = range_start; i <= range_end; i++) {
+               checksum += nvram_read(i);
+       }
+       checksum = (~checksum)&0xffff;
+
+       nvram_write((checksum >> 8), checksum_location);
+       nvram_write((checksum & 0xff), checksum_location + 1);
+}
+
 static int get_cmos_value(u32 bitnum, u32 len, void *valptr)
 {
        u8 *value = (u8 *)valptr;

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