Kornel Dulęba 66c73af7ea stand: Parse BIOS revision from SMBIOS
Add a smbios.bios.revision kenv, which contains the system BIOS revision
as defined in SMBIOS specification, section 3.3.1.
Since the revision is stored in two separate byte fields,
the smbios_setenv helper can't be used.
Read and construct the kenv manually instead.

Approved by:	mw(mentor)
Sponsored by:	Stormshield
Obtained from:	Semihalf
Differential Revision:	https://reviews.freebsd.org/D36413
2022-09-02 13:10:32 +02:00
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