From 75edff29b2c0157a15ad7fd565cab9ae94f7292f Mon Sep 17 00:00:00 2001
From: Willy Tarreau <w@1wt.eu>
Date: Tue, 10 Dec 2024 04:40:22 +0100
Subject: system: retrieve the serial console's baud rate at boot

Calling agetty without any speed on the boot console tends to turn it
to 9600 bauds by default. Let's try to get the device speed at boot
before it's modified, in order to explicitly set the correct speed
before modifying inittab.
---
 sbin/init.d/system | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sbin/init.d/system b/sbin/init.d/system
index e5c9cd4..3041891 100755
--- a/sbin/init.d/system
+++ b/sbin/init.d/system
@@ -129,6 +129,17 @@ function update_consoles {
                 chmod 620 "${path}"
             fi
 
+            # get the boot baud rate if none was set, or default to 115200
+            if [ -n "${name##*:*}" ]; then
+                # try to get baud rate at boot
+                baud=$(stty </dev/ttyS2 | grep -o 'speed [0-9]*' | cut -f2 -d' ') 2>/dev/null
+                if [ -n "$baud" ]; then
+                    name=${name}:$baud
+                else
+                    name=${name}:115200
+                fi
+            fi
+
             ser_consoles=( "${ser_consoles[@]}" "$name" )
         fi
     done
-- 
2.17.5