Can't get grub2 boot menu via COM2 port
Clash Royale CLAN TAG#URR8PPP
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 Jan 20 at 5:24
mrcomrco
1244
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 Jan 20 at 5:24
mrcomrco
1244
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 Jan 20 at 5:24
mrcomrco
1244
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 Jan 20 at 5:24
mrcomrco
1244
asked Jan 20 at 5:24
mrcomrco
1244
asked Jan 20 at 5:24
mrcomrco
1244
asked Jan 20 at 5:24
mrcomrco
1244
asked Jan 20 at 5:24
mrcomrco
1244
1244
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 Jan 20 at 5:48
Michael Hampton♦Michael Hampton
168k27307629
I truly appreciate your timely help.
– mrco
Jan 20 at 5:53
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 Jan 20 at 5:50
anxanx
1,5821720
I'm too young too simple,,,it works!!
– mrco
Jan 20 at 5:52
add a comment |
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2 Answers
2
active
oldest
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2 Answers
2
active
oldest
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active
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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 Jan 20 at 5:48
Michael Hampton♦Michael Hampton
168k27307629
I truly appreciate your timely help.
– mrco
Jan 20 at 5:53
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 Jan 20 at 5:48
Michael Hampton♦Michael Hampton
168k27307629
I truly appreciate your timely help.
– mrco
Jan 20 at 5:53
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 Jan 20 at 5:48
Michael Hampton♦Michael Hampton
168k27307629
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 Jan 20 at 5:48
Michael Hampton♦Michael Hampton
168k27307629
answered Jan 20 at 5:48
Michael Hampton♦Michael Hampton
168k27307629
answered Jan 20 at 5:48
Michael Hampton♦Michael Hampton
168k27307629
answered Jan 20 at 5:48
Michael Hampton♦Michael Hampton
168k27307629
168k27307629
I truly appreciate your timely help.
– mrco
Jan 20 at 5:53
add a comment |
I truly appreciate your timely help.
– mrco
Jan 20 at 5:53
I truly appreciate your timely help.
– mrco
Jan 20 at 5:53
I truly appreciate your timely help.
– mrco
Jan 20 at 5:53
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 Jan 20 at 5:50
anxanx
1,5821720
I'm too young too simple,,,it works!!
– mrco
Jan 20 at 5:52
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 Jan 20 at 5:50
anxanx
1,5821720
I'm too young too simple,,,it works!!
– mrco
Jan 20 at 5:52
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 Jan 20 at 5:50
anxanx
1,5821720
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 Jan 20 at 5:50
anxanx
1,5821720
answered Jan 20 at 5:50
anxanx
1,5821720
answered Jan 20 at 5:50
anxanx
1,5821720
answered Jan 20 at 5:50
anxanx
1,5821720
1,5821720
I'm too young too simple,,,it works!!
– mrco
Jan 20 at 5:52
add a comment |
I'm too young too simple,,,it works!!
– mrco
Jan 20 at 5:52
I'm too young too simple,,,it works!!
– mrco
Jan 20 at 5:52
I'm too young too simple,,,it works!!
– mrco
Jan 20 at 5:52
add a comment |
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