initramfs-module-bootldr-buster: Add initial code to workaround bogus system console issue.

* The main trouble is the bogus console=ttySA0 passed by bootldr
It appears that kernel doesn't have protection against only invalid
consoles being passed on the command line, which means that the
kernel is deaf and dumb when booted by bootldr.

1 files changed, 30 insertions, 0 deletions

diff --git a/packages/initrdscripts/files/01-bootldr-buster.sh b/packages/initrdscripts/files/01-bootldr-buster.sh
index 7bf312ad66..46d01903ed 100644
--- a/packages/initrdscripts/files/01-bootldr-buster.sh
+++ b/packages/initrdscripts/files/01-bootldr-buster.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 cmdl=`cat /proc/cmdline`
+#cmdl="console=ttySA0,115200 console=ttySB0,115200"
 if expr "$cmdl" : '.*mtdparts=ipaq' > /dev/null; then
     echo "!!!!!!!!"
     echo "Detected Compaq bootldr or derivative"
@@ -9,3 +10,32 @@ if expr "$cmdl" : '.*mtdparts=ipaq' > /dev/null; then
     CMDLINE=" "
     sleep 3
 fi
+
+# The main trouble is the bogus console=ttySA0 passed by bootldr
+# It appears that kernel doesn't have protection against only invalid
+# consoles being passed on the command line, which means that the
+# kernel is deaf and dumb when booted by bootldr
+
+INVALID_CONSOLE=0
+VALID_CONSOLE=0
+
+for arg in $cmdl; do
+        optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
+        case $arg in
+            console=*)
+		if expr "$optarg" : 'ttySA[0-9]\+' > /dev/null; then
+		    INVALID_CONSOLE=1
+                elif expr "$optarg" : 'ttyS\?[0-9]\+' > /dev/null; then
+		    VALID_CONSOLE=1
+		fi
+		;;
+        esac
+done
+
+if [ $INVALID_CONSOLE -eq 1 -a $VALID_CONSOLE -eq 0 ]; then
+    echo "!!!!!!!!"
+    echo "No valid system console is detected"
+    echo "Explicitly using /dev/tty0 for input/output"
+    echo "!!!!!!!!"
+    CONSOLE="/dev/tty0"
+fi