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Allow custom console=tty0 argument

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The bootloader element now has variable
DIB_BOOTLOADER_VIRTUAL_TERMINAL to customize or suppress the
console=tty0 kernel argument.

This is proposed to allow console=tty0 to be removed entirely as it is
causing significant performance degredation in DPDK environments.

Change-Id: Iba2ee5b8a6b4acdd236a770550dffd29c784ce11
Related: rhbz#2179366
This commit is contained in:
Steve Baker 2023-04-11 15:49:03 +12:00
parent 1bb559b684
commit d56dd56881
4 changed files with 28 additions and 5 deletions
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5
diskimage_builder/elements/bootloader/README.rst
View File

@ -17,3 +17,8 @@ Arguments
* ``DIB_BOOTLOADER_SERIAL_CONSOLE`` sets the serial device to be
used as a console. It defaults to ``hvc0`` for PowerPC,
``ttyAMA0,115200`` for ARM64, otherwise ``ttyS0,115200``.
* ``DIB_BOOTLOADER_VIRTUAL_TERMINAL`` sets the virtual terminal be
used as a console. It defaults to ``tty0``. When explicitly set
to an empty string then no virtual terminal console kernel argument
is added.

7
diskimage_builder/elements/bootloader/environment.d/10-bootloader-default-cmdline
View File

@ -1,2 +1,9 @@
export DIB_BOOTLOADER_DEFAULT_CMDLINE=${DIB_BOOTLOADER_DEFAULT_CMDLINE:-"nofb nomodeset gfxpayload=text"}
export DIB_BOOTLOADER_SERIAL_CONSOLE=${DIB_BOOTLOADER_SERIAL_CONSOLE:-""}
if [ ! -v DIB_BOOTLOADER_VIRTUAL_TERMINAL ]; then
# DIB_BOOTLOADER_VIRTUAL_TERMINAL is unset
export DIB_BOOTLOADER_VIRTUAL_TERMINAL=tty0
else
# DIB_BOOTLOADER_VIRTUAL_TERMINAL is set to empty string or other value
export DIB_BOOTLOADER_VIRTUAL_TERMINAL=${DIB_BOOTLOADER_VIRTUAL_TERMINAL}
fi

16
diskimage_builder/elements/bootloader/finalise.d/50-bootloader
View File

@ -135,17 +135,23 @@ fi
if [[ -n "${DIB_BOOTLOADER_SERIAL_CONSOLE}" ]]; then
SERIAL_CONSOLE="${DIB_BOOTLOADER_SERIAL_CONSOLE}"
SERIAL_CONSOLE="console=${DIB_BOOTLOADER_SERIAL_CONSOLE}"
elif [[ "powerpc ppc64 ppc64le" =~ "$ARCH" ]]; then
# Serial console on Power is hvc0
SERIAL_CONSOLE="hvc0"
SERIAL_CONSOLE="console=hvc0"
elif [[ "arm64" =~ "$ARCH" ]]; then
SERIAL_CONSOLE="ttyAMA0,115200"
SERIAL_CONSOLE="console=ttyAMA0,115200"
else
SERIAL_CONSOLE="ttyS0,115200"
SERIAL_CONSOLE="console=ttyS0,115200"
fi
GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=${SERIAL_CONSOLE} no_timer_check"
if [[ -n "${DIB_BOOTLOADER_VIRTUAL_TERMINAL}" ]]; then
VIRTUAL_TERMINAL="console=${DIB_BOOTLOADER_VIRTUAL_TERMINAL}"
else
VIRTUAL_TERMINAL=""
fi
GRUB_CMDLINE_LINUX_DEFAULT="${VIRTUAL_TERMINAL} ${SERIAL_CONSOLE} no_timer_check"
echo "GRUB_CMDLINE_LINUX_DEFAULT=\"${GRUB_CMDLINE_LINUX_DEFAULT} ${DIB_BOOTLOADER_DEFAULT_CMDLINE} ${BOOT_FS} ${BOOT_FIPS}\"" >>/etc/default/grub
echo 'GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"' >>/etc/default/grub

5
releasenotes/notes/tty0-d01980dce4ed7786.yaml Normal file
View File

@ -0,0 +1,5 @@
---
features:
- |
The bootloader element now has variable DIB_BOOTLOADER_VIRTUAL_TERMINAL to
customize or suppress the console=tty0 kernel argument.