Christian Gmeiner ([email protected]) just uploaded a new patch set 
to gerrit, which you can find at http://review.coreboot.org/1232

-gerrit

commit 2c4313c3e595fca2b18b573123f35fe48ea96b35
Author: Christian Gmeiner <[email protected]>
Date:   Tue Jul 24 13:45:15 2012 +0200

    Extend smbios api to allow runtime change of mainboard serial and version
    
    This patch extends the current smbios api to allow changing mainboard
    serial and version during coreboot runtime. This is helpful if you
    have an EEPROM etc. to access these informations and want to add
    some quirks for broken hardware revision for the linux kernel.
    This could be done via DMI_MATCH marco.
    
    Change-Id: I1924a56073084e965a23e47873d9f8542070423c
    Signed-off-by: Christian Gmeiner <[email protected]>
---
 src/arch/x86/boot/smbios.c |   14 ++++++++++++--
 src/include/smbios.h       |    3 +++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/arch/x86/boot/smbios.c b/src/arch/x86/boot/smbios.c
index 3b9e5a1..96a834a 100644
--- a/src/arch/x86/boot/smbios.c
+++ b/src/arch/x86/boot/smbios.c
@@ -162,6 +162,16 @@ static int smbios_write_type0(unsigned long *current, int 
handle)
        return len;
 }
 
+const char *__attribute__((weak)) smbios_mainboard_serial_number(void)
+{
+       return CONFIG_MAINBOARD_SERIAL_NUMBER;
+}
+
+const char *__attribute__((weak)) smbios_mainboard_version(void)
+{
+       return CONFIG_MAINBOARD_VERSION;
+}
+
 static int smbios_write_type1(unsigned long *current, int handle)
 {
        struct smbios_type1 *t = (struct smbios_type1 *)*current;
@@ -173,8 +183,8 @@ static int smbios_write_type1(unsigned long *current, int 
handle)
        t->length = len - 2;
        t->manufacturer = smbios_add_string(t->eos, CONFIG_MAINBOARD_VENDOR);
        t->product_name = smbios_add_string(t->eos, 
CONFIG_MAINBOARD_PART_NUMBER);
-       t->serial_number = smbios_add_string(t->eos, 
CONFIG_MAINBOARD_SERIAL_NUMBER);
-       t->version = smbios_add_string(t->eos, CONFIG_MAINBOARD_VERSION);
+       t->serial_number = smbios_add_string(t->eos, 
smbios_mainboard_serial_number());
+       t->version = smbios_add_string(t->eos, smbios_mainboard_version());
        len = t->length + smbios_string_table_len(t->eos);
        *current += len;
        return len;
diff --git a/src/include/smbios.h b/src/include/smbios.h
index 7912ba1..94b15da 100644
--- a/src/include/smbios.h
+++ b/src/include/smbios.h
@@ -3,6 +3,9 @@
 
 #include <types.h>
 
+const char *__attribute__((weak)) smbios_mainboard_serial_number(void);
+const char *__attribute__((weak)) smbios_mainboard_version(void);
+
 unsigned long smbios_write_tables(unsigned long start);
 int smbios_add_string(char *start, const char *str);
 int smbios_string_table_len(char *start);

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