Language Selection

English French German Italian Portuguese Spanish

The current state of UEFI and Linux

Filed under
Linux

Executive summary: Most things work fine.

Things we know are broken:

* Some Samsung laptops. The samsung-laptop driver is a slightly weird thing. By 2010 (when it first appeared) most vendors had moved over to using some level of firmware abstraction, either using ACPI or WMI. Samsung still seemed to be stuck around a decade earlier - they were providing a region of memory at a known address, and you'd read that address to find a bunch of offsets. Then you'd write magic values based on those offsets to magic system IO ports based on those offsets and something would happen. Those writes were triggering System Management Mode, a special x86 CPU mode where the processor executes code from memory that the OS can't see, without telling the OS that it's doing so. There's nothing especially new in this (SMM first appeared in the 386sl back in 1990), but it also means that you depend on the system vendor not changing the interface without telling you. Turns out that Samsung apparently changed their platform interface when they moved to UEFI, but didn't actually do anything to prevent old drivers from breaking things -

rest here




More in Tux Machines

Type Title Author Replies Last Postsort icon
Story Zorin OS 12.1 Lite, the Xfce one Rianne Schestowitz 23/08/2017 - 9:46pm
Story 5 Reasons Linux Is Now a Great Option for Anyone Rianne Schestowitz 23/08/2017 - 9:42pm
Story Touch-panel PCs run Raspbian on Raspberry Pi CM3 Rianne Schestowitz 23/08/2017 - 9:39pm
Story today's leftovers Roy Schestowitz 23/08/2017 - 4:24pm
Story Kernel and Graphics: Linux 4.13, FP64, Inputfd Roy Schestowitz 23/08/2017 - 4:23pm
Story Kubuntu and Ubuntu Leftovers Roy Schestowitz 23/08/2017 - 4:22pm
Story OSS Leftovers Roy Schestowitz 23/08/2017 - 4:14pm
Story Fedora and Red Hat Leftovers Roy Schestowitz 23/08/2017 - 3:11pm
Story Security: NHS Windows Nightmare Resumes, Deep-Insert Skimmers and More Roy Schestowitz 23/08/2017 - 3:09pm
Story today's howtos Roy Schestowitz 23/08/2017 - 3:07pm