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
asked 1 hour ago
mrcomrco
1094
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
asked 1 hour ago
mrcomrco
1094
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
asked 1 hour ago
mrcomrco
1094
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 1 hour ago
mrcomrco
1094
asked 1 hour ago
mrcomrco
1094
asked 1 hour ago
mrcomrco
1094
asked 1 hour ago
mrcomrco
1094
asked 1 hour 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.
answered 53 mins ago
Michael Hampton♦Michael Hampton
166k26305625
I truly appreciate your timely help.
– mrco
48 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
answered 51 mins ago
anxanx
1,4541719
I'm too young too simple,,,it works!!
– mrco
49 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.
answered 53 mins ago
Michael Hampton♦Michael Hampton
166k26305625
I truly appreciate your timely help.
– mrco
48 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.
answered 53 mins ago
Michael Hampton♦Michael Hampton
166k26305625
I truly appreciate your timely help.
– mrco
48 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.
answered 53 mins ago
Michael Hampton♦Michael Hampton
166k26305625
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 53 mins ago
Michael Hampton♦Michael Hampton
166k26305625
answered 53 mins ago
Michael Hampton♦Michael Hampton
166k26305625
answered 53 mins ago
Michael Hampton♦Michael Hampton
166k26305625
answered 53 mins ago
Michael Hampton♦Michael Hampton
166k26305625
166k26305625
I truly appreciate your timely help.
– mrco
48 mins ago
add a comment |
I truly appreciate your timely help.
– mrco
48 mins ago
I truly appreciate your timely help.
– mrco
48 mins ago
I truly appreciate your timely help.
– mrco
48 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
answered 51 mins ago
anxanx
1,4541719
I'm too young too simple,,,it works!!
– mrco
49 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
answered 51 mins ago
anxanx
1,4541719
I'm too young too simple,,,it works!!
– mrco
49 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
answered 51 mins ago
anxanx
1,4541719
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 51 mins ago
anxanx
1,4541719
answered 51 mins ago
anxanx
1,4541719
answered 51 mins ago
anxanx
1,4541719
answered 51 mins ago
anxanx
1,4541719
1,4541719
I'm too young too simple,,,it works!!
– mrco
49 mins ago
add a comment |
I'm too young too simple,,,it works!!
– mrco
49 mins ago
I'm too young too simple,,,it works!!
– mrco
49 mins ago
I'm too young too simple,,,it works!!
– mrco
49 mins ago
add a comment |
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