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-rw-r--r--syslinux.doc4
1 files changed, 4 insertions, 0 deletions
diff --git a/syslinux.doc b/syslinux.doc
index 3a064858..71cbbe4f 100644
--- a/syslinux.doc
+++ b/syslinux.doc
@@ -234,6 +234,10 @@ SERIAL port [[baudrate] flowcontrol]
For the SERIAL directive to be guaranteed to work properly, it
should be the first directive in the configuration file.
+ NOTE: "port" values from 0 to 3 means the first four serial
+ ports detected by the BIOS. They may or may not correspond to
+ the legacy port values 0x3F8, 0x2F8, 0x3E8, 0x2E8.
+
FONT filename
Load a font in .psf format before displaying any output
(except the copyright line, which is output as ldlinux.sys