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libpayload: Add function to fix CMOS checksum. 

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Myles Watson <mylesgw@gmail.com>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5711 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Stefan Reinauer 2010-08-17 10:14:50 +00:00 committed by Patrick Georgi
parent 835674b929
commit 59a1b7f7f1
2 changed files with 18 additions and 0 deletions
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17
payloads/libpayload/drivers/options.c
View File

@ -48,6 +48,23 @@ static int options_checksum_valid(void)
return (checksum_old == checksum); 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) static int get_cmos_value(u32 bitnum, u32 len, void *valptr)
{ {
u8 *value = (u8 *)valptr; u8 *value = (u8 *)valptr;

1
payloads/libpayload/include/libpayload.h
View File

@ -194,6 +194,7 @@ void video_console_set_cursor(unsigned int cursorx, unsigned int cursory);
/** @} */ /** @} */
/* drivers/option.c */ /* drivers/option.c */
void fix_options_checksum(void);
int get_option(void *dest, char *name); int get_option(void *dest, char *name);
/** /**