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 24-Way NVIDIA/AMD GPU Benchmarks With X-Plane 11 Rianne Schestowitz 17/01/2018 - 9:42pm
Story Librem 5 Privacy-Focused Linux Phone Crowdfunding Campaign Ends with $2 Million Rianne Schestowitz 17/01/2018 - 9:40pm
Story Linux Kernel: Linux 4.14.14, Linux 4.9.77, Linux 4.4.112 and Linux 3.18.92 Rianne Schestowitz 17/01/2018 - 9:36pm
Story Linux Foundation LFCS and LFCE: Alberto Bullo Rianne Schestowitz 17/01/2018 - 9:30pm
Story RF-enabled Raspberry Pi add-on brings Google Assistant to gizmos, speakers, and robots Rianne Schestowitz 17/01/2018 - 9:26pm
Story How To Install Windows 10 In Virtualbox On Linux Mohd Sohail 17/01/2018 - 6:06pm
Story OSS Leftovers and Security Roy Schestowitz 17/01/2018 - 5:19pm
Story Software: VirtualBox, Dillinger, FBReader, KDE Discover Roy Schestowitz 17/01/2018 - 5:17pm
Story Mozilla Leftovers Roy Schestowitz 17/01/2018 - 5:12pm
Story GNU: GCC 7.3 and LibrePlanet 2018 Keynote Speakers Roy Schestowitz 17/01/2018 - 5:10pm