With the DeviceTree addition for the Raspberry Pi 400. No kernel driver changes were needed since it’s basically very close to the Raspberry Pi 4 but the updated DTS configuration is needed for the 1.8GHz clock rate, a different WiFi chip, power off handling via GPIO, and no ACT LED on the 400 model.
Source: Linux 5.14 Mainline Should Work With The Raspberry Pi 400 – Phoronix
The random changes have been sent in for Linux 5.6 that yield /dev/random behavioral changes and a new random flag.
Source: /dev/random Is More Like /dev/urandom With Linux 5.6 – Phoronix
With the onset of a new decade, Linux Kernel 5.6 is already prepared to resolve the “Y2038” or “Unix Y2K” problem that can arise in the upcoming decade.
Ahead of USB4 devices expected to begin appearing later this year, the Linux 5.6 kernel is wired up with initial USB4 support.
Source: USB4 Support Lands In The Linux 5.6 Kernel – Phoronix
Linus Torvalds has released the first stable Linux kernel update of 2020, Linux 5.5 – and it’s on schedule despite the worries that downtime over the holidays would have an impact on its release. The Linux 5.5 kernel update (dubbed “Kleptomaniac Octopus”) brings a host of performance tweaks as well as support for devices like the Raspberry Pi 4 and Broadcom chip BCM2711.
Source: “Welcome, Kleptomaniac Octopus” – Linux 5.5 Lands, Here’s What’s New
The Linux® system call interface permits user-space applications to invoke functionality in the kernel, but what about invoking user-space applications from the kernel? Explore the usermode-helper API, and learn how to invoke user-space applications and manipulate their output. Read more…
Linux documentation on long delays, short delays and timeouts. This also describes the api’s used to achieve the same and also the advantages, disadvantages and also the situation in which each better suits. Some informations in the documentation can be out dated based on latest code. Read More…