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build: allow specifying flow-control to grub on serial console
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>
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@ -203,6 +203,11 @@ menu "Target Images"
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default 38400 if TARGET_x86_generic
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default 115200
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config GRUB_FLOWCONTROL
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bool "Use RTE/CTS on serial console"
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depends on GRUB_SERIAL != ""
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default n
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config GRUB_BOOTOPTS
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string "Extra kernel boot options"
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depends on GRUB_IMAGES
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@ -32,8 +32,8 @@ endif
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GRUB_SERIAL:=$(call qstrip,$(CONFIG_GRUB_SERIAL))
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ifneq ($(GRUB_SERIAL),)
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GRUB_CONSOLE_CMDLINE += console=$(GRUB_SERIAL),$(CONFIG_GRUB_BAUDRATE)n8
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GRUB_SERIAL_CONFIG := serial --unit=0 --speed=$(CONFIG_GRUB_BAUDRATE) --word=8 --parity=no --stop=1 --rtscts=off
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GRUB_CONSOLE_CMDLINE += console=$(GRUB_SERIAL),$(CONFIG_GRUB_BAUDRATE)n8$(if $(CONFIG_GRUB_FLOWCONTROL),r,)
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GRUB_SERIAL_CONFIG := serial --unit=0 --speed=$(CONFIG_GRUB_BAUDRATE) --word=8 --parity=no --stop=1 --rtscts=$(if $(CONFIG_GRUB_FLOWCONTROL),on,off)
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GRUB_TERMINALS += serial
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endif
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