| Message ID | 20250424111932.294612-1-mikko.rapeli@linaro.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | systemd-serialgetty: disable on genericarm64 | expand |
diff --git a/meta-yocto-bsp/recipes-core/systemd/systemd-serialgetty.bbappend b/meta-yocto-bsp/recipes-core/systemd/systemd-serialgetty.bbappend new file mode 100644 index 0000000000..9fd43259db --- /dev/null +++ b/meta-yocto-bsp/recipes-core/systemd/systemd-serialgetty.bbappend @@ -0,0 +1,4 @@ +do_install:prepend:genericarm64() { + # use systemd defaults to reduce boot delay from non-existing tty's + exit 0 +}
Upstream systemd setup with udev starts agetty on detected tty's so there is no need to use the build time SERIAL_CONSOLES variable. Trying to start agetty on non-existing tty's from SERIAL_CONSOLES more than doubles the boot time to systemd "running" or "degraded" state. Boot time before this change (core-image-base with systemd-analyze, qemu, aarch64 build host): root@genericarm64:~# systemd-analyze Startup finished in 2.409s (firmware) + 5.116s (loader) + 10.274s (kernel) + 1min 33.887s (userspace) = 1min 51.687s multi-user.target reached after 1min 33.876s in userspace. root@genericarm64:~# journalctl -b -a|grep tty|tail -15 Apr 24 08:51:01 genericarm64 systemd[1]: dev-ttyS1.device: Job dev-ttyS1.device/start timed out. Apr 24 08:51:01 genericarm64 systemd[1]: Timed out waiting for device /dev/ttyS1. Apr 24 08:51:01 genericarm64 systemd[1]: Dependency failed for Serial Getty on ttyS1. Apr 24 08:51:01 genericarm64 systemd[1]: serial-getty@ttyS1.service: Job serial-getty@ttyS1.service/start failed with result 'dependency'. Apr 24 08:51:01 genericarm64 systemd[1]: dev-ttyS1.device: Job dev-ttyS1.device/start failed with result 'timeout'. Apr 24 08:51:01 genericarm64 systemd[1]: dev-ttyS2.device: Job dev-ttyS2.device/start timed out. Apr 24 08:51:01 genericarm64 systemd[1]: Timed out waiting for device /dev/ttyS2. Apr 24 08:51:01 genericarm64 systemd[1]: Dependency failed for Serial Getty on ttyS2. Apr 24 08:51:01 genericarm64 systemd[1]: serial-getty@ttyS2.service: Job serial-getty@ttyS2.service/start failed with result 'dependency'. Apr 24 08:51:01 genericarm64 systemd[1]: dev-ttyS2.device: Job dev-ttyS2.device/start failed with result 'timeout'. Apr 24 08:51:01 genericarm64 systemd[1]: dev-ttyS0.device: Job dev-ttyS0.device/start timed out. Apr 24 08:51:01 genericarm64 systemd[1]: Timed out waiting for device /dev/ttyS0. Apr 24 08:51:01 genericarm64 systemd[1]: Dependency failed for Serial Getty on ttyS0. Apr 24 08:51:01 genericarm64 systemd[1]: serial-getty@ttyS0.service: Job serial-getty@ttyS0.service/start failed with result 'dependency'. Apr 24 08:51:01 genericarm64 systemd[1]: dev-ttyS0.device: Job dev-ttyS0.device/start failed with result 'timeout'. Boot time with this change: root@genericarm64:~# systemd-analyze Startup finished in 2.411s (firmware) + 5.109s (loader) + 10.208s (kernel) + 24.868s (userspace) = 42.598s multi-user.target reached after 24.848s in userspace. root@genericarm64:~# journalctl -b -a |grep tty|tail -15 Apr 03 20:34:34 genericarm64 kernel: printk: legacy console [ttyAMA0] enabled Apr 03 20:34:34 genericarm64 kernel: 9040000.pl011: ttyAMA1 at MMIO 0x9040000 (irq = 14, base_baud = 0) is a PL011 rev1 Apr 03 20:34:35 genericarm64 systemd[1]: Created slice Slice /system/getty. Apr 03 20:34:35 genericarm64 systemd[1]: Created slice Slice /system/serial-getty. Apr 03 20:34:35 genericarm64 systemd[1]: Expecting device /dev/ttyAMA0... Apr 03 20:34:44 genericarm64 systemd[1]: Found device /dev/ttyAMA0. Apr 03 20:34:51 genericarm64 kernel[349]: printk: legacy console [tty0] enabled Apr 03 20:34:51 genericarm64 kernel[349]: 9000000.pl011: ttyAMA0 at MMIO 0x9000000 (irq = 13, base_baud = 0) is a PL011 rev1 Apr 03 20:34:51 genericarm64 kernel[349]: printk: legacy console [ttyAMA0] enabled Apr 03 20:34:51 genericarm64 kernel[349]: 9040000.pl011: ttyAMA1 at MMIO 0x9040000 (irq = 14, base_baud = 0) is a PL011 rev1 Apr 03 20:34:52 genericarm64 systemd[1]: Started Getty on tty1. Apr 03 20:34:52 genericarm64 kernel[349]: systemd[1]: Created slice Slice /system/getty. Apr 03 20:34:52 genericarm64 kernel[349]: systemd[1]: Created slice Slice /system/serial-getty. Apr 03 20:34:52 genericarm64 kernel[349]: systemd[1]: Expecting device /dev/ttyAMA0... Apr 03 20:34:52 genericarm64 systemd[1]: Started Serial Getty on ttyAMA0. Changing the SERIAL_CONSOLES variable with systemd init ("systemd" in DISTRO_FEATURES for example) is not possible so changing systemd-serialgetty directly. systemd-serialgetty is now always installed with systemd. Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org> --- .../recipes-core/systemd/systemd-serialgetty.bbappend | 4 ++++ 1 file changed, 4 insertions(+) create mode 100644 meta-yocto-bsp/recipes-core/systemd/systemd-serialgetty.bbappend