** Description changed: + [Impact] + + CONFIG_SERIAL_8250_MID=y is required to properly use the serial console + on some platforms that are using the "mid" serial driver (such as some + Intel SoC platforms). + + The generic kernel should build this driver statically to make sure we + properly support these platforms. + + [Test case] + + Boot the Ubuntu generic kernel on a system that is using the "mid" + serial driver (e.g, no PCI serial). + + [Fix] + + Enable CONFIG_SERIAL_8250_MID=y. + + [Regression potential] + + Kernel footprint is increased a bit with this change (around +9K), so we + may see little performance regressions at boot time in really small + platforms (additional memory usage is probably negligible), but it is + worth it, otherwise we won't be able to properly support these + platforms. + + NOTE: we may want to disable this option in the could kernels and + derivatives and keep it only for the generic. + + [Original bug report] + Starting from 5.19 HWE kernel, this option became as dedicated module instead of being compiled into the kernel. 5.19 hwe-next also has CONFIG_SERIAL_8250_MID=m On 5.15 it was OK ~$ uname -r 5.19.0-32-generic $ cat /boot/config-5.19.0-32-generic | grep 8250_MID CONFIG_SERIAL_8250_MID=m Please make it CONFIG_SERIAL_8250_MID=y for all the future kernels. Previous ticket: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1967338 Some discussion: https://lists.ubuntu.com/archives/kernel-team/2022-March/128690.html Thanks!
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2009283 Title: linux: CONFIG_SERIAL_8250_MID=y Status in linux package in Ubuntu: Confirmed Status in linux source package in Kinetic: New Status in linux source package in Lunar: Confirmed Bug description: [Impact] CONFIG_SERIAL_8250_MID=y is required to properly use the serial console on some platforms that are using the "mid" serial driver (such as some Intel SoC platforms). The generic kernel should build this driver statically to make sure we properly support these platforms. [Test case] Boot the Ubuntu generic kernel on a system that is using the "mid" serial driver (e.g, no PCI serial). [Fix] Enable CONFIG_SERIAL_8250_MID=y. [Regression potential] Kernel footprint is increased a bit with this change (around +9K), so we may see little performance regressions at boot time in really small platforms (additional memory usage is probably negligible), but it is worth it, otherwise we won't be able to properly support these platforms. NOTE: we may want to disable this option in the could kernels and derivatives and keep it only for the generic. [Original bug report] Starting from 5.19 HWE kernel, this option became as dedicated module instead of being compiled into the kernel. 5.19 hwe-next also has CONFIG_SERIAL_8250_MID=m On 5.15 it was OK ~$ uname -r 5.19.0-32-generic $ cat /boot/config-5.19.0-32-generic | grep 8250_MID CONFIG_SERIAL_8250_MID=m Please make it CONFIG_SERIAL_8250_MID=y for all the future kernels. Previous ticket: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1967338 Some discussion: https://lists.ubuntu.com/archives/kernel-team/2022-March/128690.html Thanks! To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2009283/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
