Can't get grub2 boot menu via COM2 port
I want to connect my "CentOS Linux release 7.6.1810 (Core)" device via COM2 port,then I modify '/etc/default/grub':
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="serial"
GRUB_CMDLINE_LINUX="console=tty0 console=ttyS1,115200n8"
GRUB_DISABLE_RECOVERY="true"
GRUB_TERMINAL="serial console"
GRUB_SERIAL_COMMAND="115200n8 serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
then run:
grub2-mkconfig -o /boot/grub2/grub.cfg
as the result I could only get the output after "boot menu", not including the grub2.
PS: I'm using COM2(ttyS1) not COM1(ttyS0)
centos7 grub serial
add a comment |
I want to connect my "CentOS Linux release 7.6.1810 (Core)" device via COM2 port,then I modify '/etc/default/grub':
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="serial"
GRUB_CMDLINE_LINUX="console=tty0 console=ttyS1,115200n8"
GRUB_DISABLE_RECOVERY="true"
GRUB_TERMINAL="serial console"
GRUB_SERIAL_COMMAND="115200n8 serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
then run:
grub2-mkconfig -o /boot/grub2/grub.cfg
as the result I could only get the output after "boot menu", not including the grub2.
PS: I'm using COM2(ttyS1) not COM1(ttyS0)
centos7 grub serial
add a comment |
I want to connect my "CentOS Linux release 7.6.1810 (Core)" device via COM2 port,then I modify '/etc/default/grub':
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="serial"
GRUB_CMDLINE_LINUX="console=tty0 console=ttyS1,115200n8"
GRUB_DISABLE_RECOVERY="true"
GRUB_TERMINAL="serial console"
GRUB_SERIAL_COMMAND="115200n8 serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
then run:
grub2-mkconfig -o /boot/grub2/grub.cfg
as the result I could only get the output after "boot menu", not including the grub2.
PS: I'm using COM2(ttyS1) not COM1(ttyS0)
centos7 grub serial
I want to connect my "CentOS Linux release 7.6.1810 (Core)" device via COM2 port,then I modify '/etc/default/grub':
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="serial"
GRUB_CMDLINE_LINUX="console=tty0 console=ttyS1,115200n8"
GRUB_DISABLE_RECOVERY="true"
GRUB_TERMINAL="serial console"
GRUB_SERIAL_COMMAND="115200n8 serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
then run:
grub2-mkconfig -o /boot/grub2/grub.cfg
as the result I could only get the output after "boot menu", not including the grub2.
PS: I'm using COM2(ttyS1) not COM1(ttyS0)
centos7 grub serial
centos7 grub serial
asked 45 mins ago
mrcomrco
1094
1094
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Your GRUB_SERIAL_COMMAND
is specifying to use serial port 0, but you specifically said you wanted to use serial port 1.
You specified --unit=0
, which means serial port 0.
You should instead use --unit=1
, to use serial port 1.
Also, your serial command begins with 115200n8
which is not valid and should not be present. It should instead start with serial
.
I truly appreciate your timely help.
– mrco
16 mins ago
add a comment |
If you only need the second one, simply change the --unit=0
into --unit=1
.
The serial unit 0 is usually called ‘COM1’, so, if you want to use COM2, you must specify ‘--unit=1’ instead. -- grub manual
I'm too young too simple,,,it works!!
– mrco
17 mins ago
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Your GRUB_SERIAL_COMMAND
is specifying to use serial port 0, but you specifically said you wanted to use serial port 1.
You specified --unit=0
, which means serial port 0.
You should instead use --unit=1
, to use serial port 1.
Also, your serial command begins with 115200n8
which is not valid and should not be present. It should instead start with serial
.
I truly appreciate your timely help.
– mrco
16 mins ago
add a comment |
Your GRUB_SERIAL_COMMAND
is specifying to use serial port 0, but you specifically said you wanted to use serial port 1.
You specified --unit=0
, which means serial port 0.
You should instead use --unit=1
, to use serial port 1.
Also, your serial command begins with 115200n8
which is not valid and should not be present. It should instead start with serial
.
I truly appreciate your timely help.
– mrco
16 mins ago
add a comment |
Your GRUB_SERIAL_COMMAND
is specifying to use serial port 0, but you specifically said you wanted to use serial port 1.
You specified --unit=0
, which means serial port 0.
You should instead use --unit=1
, to use serial port 1.
Also, your serial command begins with 115200n8
which is not valid and should not be present. It should instead start with serial
.
Your GRUB_SERIAL_COMMAND
is specifying to use serial port 0, but you specifically said you wanted to use serial port 1.
You specified --unit=0
, which means serial port 0.
You should instead use --unit=1
, to use serial port 1.
Also, your serial command begins with 115200n8
which is not valid and should not be present. It should instead start with serial
.
answered 22 mins ago
Michael Hampton♦Michael Hampton
166k26305625
166k26305625
I truly appreciate your timely help.
– mrco
16 mins ago
add a comment |
I truly appreciate your timely help.
– mrco
16 mins ago
I truly appreciate your timely help.
– mrco
16 mins ago
I truly appreciate your timely help.
– mrco
16 mins ago
add a comment |
If you only need the second one, simply change the --unit=0
into --unit=1
.
The serial unit 0 is usually called ‘COM1’, so, if you want to use COM2, you must specify ‘--unit=1’ instead. -- grub manual
I'm too young too simple,,,it works!!
– mrco
17 mins ago
add a comment |
If you only need the second one, simply change the --unit=0
into --unit=1
.
The serial unit 0 is usually called ‘COM1’, so, if you want to use COM2, you must specify ‘--unit=1’ instead. -- grub manual
I'm too young too simple,,,it works!!
– mrco
17 mins ago
add a comment |
If you only need the second one, simply change the --unit=0
into --unit=1
.
The serial unit 0 is usually called ‘COM1’, so, if you want to use COM2, you must specify ‘--unit=1’ instead. -- grub manual
If you only need the second one, simply change the --unit=0
into --unit=1
.
The serial unit 0 is usually called ‘COM1’, so, if you want to use COM2, you must specify ‘--unit=1’ instead. -- grub manual
answered 19 mins ago
anxanx
1,4541719
1,4541719
I'm too young too simple,,,it works!!
– mrco
17 mins ago
add a comment |
I'm too young too simple,,,it works!!
– mrco
17 mins ago
I'm too young too simple,,,it works!!
– mrco
17 mins ago
I'm too young too simple,,,it works!!
– mrco
17 mins ago
add a comment |
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