On the more sophisticated (i.e. deeper FIFO) serial controllers,
flow-control might be needed to avoid dropping output.
Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
default 38400 if TARGET_x86_generic
default 115200
+ config GRUB_FLOWCONTROL
+ bool "Use RTE/CTS on serial console"
+ depends on GRUB_SERIAL != ""
+ default n
+
config GRUB_BOOTOPTS
string "Extra kernel boot options"
depends on GRUB_IMAGES
GRUB_SERIAL:=$(call qstrip,$(CONFIG_GRUB_SERIAL))
ifneq ($(GRUB_SERIAL),)
- GRUB_CONSOLE_CMDLINE += console=$(GRUB_SERIAL),$(CONFIG_GRUB_BAUDRATE)n8
- GRUB_SERIAL_CONFIG := serial --unit=0 --speed=$(CONFIG_GRUB_BAUDRATE) --word=8 --parity=no --stop=1 --rtscts=off
+ GRUB_CONSOLE_CMDLINE += console=$(GRUB_SERIAL),$(CONFIG_GRUB_BAUDRATE)n8$(if $(CONFIG_GRUB_FLOWCONTROL),r,)
+ GRUB_SERIAL_CONFIG := serial --unit=0 --speed=$(CONFIG_GRUB_BAUDRATE) --word=8 --parity=no --stop=1 --rtscts=$(if $(CONFIG_GRUB_FLOWCONTROL),on,off)
GRUB_TERMINALS += serial
endif