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smbios: Allow writing to the coreboot version string

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When U-Boot is booted from coreboot the SMBIOS tables are written by
coreboot, not U-Boot. The existing method of updating the BIOS version
string does not work in that case, since gd->smbios_version is only set
when U-Boot writes the tables.

Add a new function which allows the version to be updated by parsing the
tables and writing the string in the correct place. Since coreboot
provides a pointer to the SMBIOS tables in its sysinfo structure, this
makes it easy to do the update.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2021-03-15 18:00:11 +13:00
parent 11a38a2573
commit 272e62cb83
3 changed files with 58 additions and 4 deletions
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20
include/smbios.h
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@ -14,6 +14,10 @@
#define SMBIOS_MAJOR_VER 3
#define SMBIOS_MINOR_VER 0
enum {
SMBIOS_STR_MAX = 64, /* Maximum length allowed for a string */
};
/* SMBIOS structure types */
enum {
SMBIOS_BIOS_INFORMATION = 0,
@ -269,4 +273,20 @@ const char *smbios_string(const struct smbios_header *header, int index);
*/
int smbios_update_version(const char *version);
/**
* smbios_update_version_full() - Update the version string
*
* This can be called after the SMBIOS tables are written (e.g. after the U-Boot
* main loop has started) to update the BIOS version string (SMBIOS table 0).
* It scans for the correct place to put the version, so does not need U-Boot
* to have actually written the tables itself (e.g. if a previous bootloader
* did it).
*
* @smbios_tab: Start of SMBIOS tables
* @version: New version string to use
* @return 0 if OK, -ENOENT if no version string was previously written,
* -ENOSPC if the new string is too large to fit
*/
int smbios_update_version_full(void *smbios_tab, const char *version);
#endif /* _SMBIOS_H_ */