GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
# Arguments to add to the kernel command line (all entries)
-<% if @unit.nil? -%>
+<% if @units.nil? -%>
GRUB_CMDLINE_LINUX="<%= node[:hardware][:grub][:cmdline].join(" ") %>"
<% else -%>
-GRUB_CMDLINE_LINUX="console=tty0 console=ttyS<%= @unit %>,115200n8 <%= node[:hardware][:grub][:cmdline].join(" ") %>"
+GRUB_CMDLINE_LINUX="console=tty0 <%= @units.sort.uniq.collect { |unit| "console=ttyS#{unit},115200n8" }.join(" ") %> <%= node[:hardware][:grub][:cmdline].join(" ") %>"
<% end -%>
# Arguments to add to the kernel command line (except recovery entries)
# Do not wait for infinite time on a failed boot
GRUB_RECORDFAIL_TIMEOUT=2
-<% if @unit.nil? -%>
+<% if @units.nil? -%>
# Send console output to the screen
GRUB_TERMINAL="console"
<% else -%>
<% end -%>
# Configure the serial console
-GRUB_SERIAL_COMMAND="serial --speed=<%= @speed %> --unit=<%= @unit %> --word=8 --parity=no --stop=1"
+GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=<%= @units.first %> --word=8 --parity=no --stop=1"
<% end -%>