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D59969.diff
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diff --git a/stand/man/loader.8 b/stand/man/loader.8
--- a/stand/man/loader.8
+++ b/stand/man/loader.8
@@ -26,7 +26,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd July 13, 2026
+.Dd July 14, 2026
.Dt LOADER 8
.Os
.Sh NAME
@@ -243,6 +243,24 @@
.Xr loader_simp 8
.Dq BUILTIN ENVIRONMENT VARIABLES
section.
+.Pp
+The following variables are set automatically on the BIOS loader on
+the i386 and amd64 architectures, reporting what the PCI BIOS
+.Pq INT 0x1A
+probe found.
+They are not normally set by hand.
+.Bl -tag -width indent -compact
+.It Va pcibios.major
+.It Va pcibios.minor
+The major and minor version of the PCI BIOS found.
+.It Va pcibios.config1
+.It Va pcibios.config2
+Whether PCI configuration mechanism #1 or #2
+.Pq respectively
+is supported.
+.It Va pcibios.maxbus
+The highest PCI bus number the PCI BIOS reported.
+.El
.Sh SEE ALSO
.Xr libsa 3 ,
.Xr loader.conf 5 ,
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