Linux Developers Jump Quickly On ACPI 5.1, Helps Out ARM
Written by Michael Larabel in Hardware on 24 July 2014 at 09:48 AM EDT. 11 Comments
Fresh off the release of ACPI 5.1 by the UEFI Forum, Linux developers are updating their support against this latest revision to the Advanced Configuration and Power Interface. In particular, ACPI 5.1 is supposed to help out ARM.

While accessing the ACPI/UEFI specifications still require jumping through some hoops, the ACPI 5.1 update is reported to fix major gaps in supporting ACPI on ARM. Hanjun Guo has already laid out patches for providing Linux ARM64 support compliant with the ACPI 5.1 specification. ACPI 5.1 has "major changes" to the MADT, FADT, GTDT, and _DSD for bettering up this non-x86 platform support.

Hanjun Guo sent out 19 patches this morning for introducing ACPI on 64-bit ARM. Developers interested in all of the ACPI AArch64 technical details can see the mailing list post. Testing of these patches from a 64-bit ARM "Juno" reference platform have shown that Linux can now boot successfully just using ACPI without any Device Tree dependence.

Also sent out were ACPICA updates for ACPI 5.1 as a temporary measure for testing the ARM64 support; a proper ACPI 5.1 update to ACPICA is being worked on by the upstream kernel developers. Hopefully with Linux 3.17 we'll be able to start seeing some updates for the ACPI 5.1 specification.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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