syslinux.bbclass: Enable additional kernel parameters for syslinux

Add additional parameter 'SYSLINUX_KERNEL_ARGS' in order to allow
for specific kernel parameters to be set when using syslinux.

The extra kernel parameters are added to btype[1] and then written out
as part of the APPEND field.

(From OE-Core rev: d78c4d51ed266c14b0425f6abf553392c6ebe408)

Signed-off-by: Konrad Scherer <Konrad.Scherer@windriver.com>
Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/meta/classes/syslinux.bbclass b/meta/classes/syslinux.bbclass
index 62d4b7a87a..8964d3ff5e 100644
--- a/meta/classes/syslinux.bbclass
+++ b/meta/classes/syslinux.bbclass
@@ -15,6 +15,7 @@
 # ${SYSLINUX_DEFAULT_CONSOLE} - set to "console=ttyX" to change kernel boot default console
 # ${SYSLINUX_SERIAL} - Set an alternate serial port or turn off serial with empty string
 # ${SYSLINUX_SERIAL_TTY} - Set alternate console=tty... kernel boot argument
+# ${SYSLINUX_KERNEL_ARGS} - Add additional kernel arguments
 
 do_bootimg[depends] += "syslinux:do_populate_sysroot \
                         syslinux-native:do_populate_sysroot"
@@ -162,6 +163,10 @@ python build_syslinux_cfg () {
         for btype in btypes:
             cfgfile.write('LABEL %s%s\nKERNEL /vmlinuz\n' % (btype[0], label))
 
+            exargs = d.getVar('SYSLINUX_KERNEL_ARGS', True)
+            if exargs:
+                btype[1] += " " + exargs
+
             append = localdata.getVar('APPEND', True)
             initrd = localdata.getVar('INITRD', True)