Arm News Archives

While ARM-based SoCs with Simultaneous Multi-Threading (SMT) aren't too common, there do exist some such as select models of the Huawei Kunpeng server SoC with SMT or there HiSilicon Kirin 9000S. As such Huawei/HiSilicon engineers have been working to expose SMT controls on ARM64 for the Linux kernel.

For more than one year Arm engineers have been working on Guarded Control Stack "GCS" support for the Linux kernel as a means of protecting against return-oriented programming (ROP) sttacks with modern AArch64 processors. It looks like for Linux 6.13 this Arm GCS support will be ready for upstreaming.

We are not done yet seeing new Arm cores still impacted by the Speculative Store Bypass handling errata. Merged to Linux 6.12 on Friday was adding the speculative SSBS workaround for the Cortex-A715, Neoverse-N3, and Microsoft Azure Cobalt 100 cores.

After years of AmpereComputing talking about AmpereOne AArch64 server processors, it looks like we are finally on the cusp of seeing broader availability of the processors and servers/motherboards for this ARM server platform up to 192 cores. At the end of August I finally received a temporary review system with the AmpereOne A192-32X flagship SKU. That server was the Supermicro ARS-211M-NR and is supposed to be seeing availability real soon. Now the latest on the AmpereOne front is Giga Computing (Gigabyte) announcing general availability of their servers.

All of the ARM SoC and platform updates have been sent out for the Linux 6.12 merge window. Exciting this cycle is finally having initial support for the Raspberry Pi 5 plus supporting several more Snapdragon X1 Elite laptops.

The 64-bit ARM changes were submitted in advance for the now-open Linux 6.12 kernel merge window. There is work for Arm on the confidential computing side this cycle and other new features.

While not quite as exciting as the latest ARM64 laptops sporting the new Qualcomm Snapdragon X1 series SoCs, the Lenovo ThinkPad X13s laptop using the older Snapdragon 8cx Gen 3 is now available to boot and install using the generic ARM64 images of the upcoming Ubuntu 24.10.

Arm engineer Mihail Atanassov proposed a set of "request for comments" patches this week for adding user submission support to the Panthor DRM driver that is used for handling newer Arm Mali graphics under Linux. This would allow user-space more easily to submit work directly to the GPU hardware without kernel intervention for better performance and management capabilities.

ARM Linux maintainer Arnd Bergmann laid out a proposal with deprecation timeline today for beginning to work toward removing many older ARM boards and obsolete features.

Following Linus Torvalds receiving an Ampere Altra Max workstation from Ampere Computing, he's been dabbling more with ARM64 now that it affords him more AArch64 compute power than his Apple Silicon powered MacBook. Torvalds kicked off the Linux 6.11 merge window by landing some of his own code to further enhance the ARM64 kernel and as we approach the end of the v6.11 merge window this weekend, he's merged some more ARM64 code.

Due to the ARM64 maintainer for the Linux kernel going on holiday, the ARM64 port updates have been submitted ahead of the opening of the Linux 6.11 merge window that will likely be on Monday or otherwise the following week depending upon if a 6.10-rc8 is warranted.

Back in May there were Linux kernel patches posted as a workaround for Arm CPU errata around the Speculative Store Bypass (SSB) handling. Initially this workaround was just noted as the Cortex-X4 and Neoverse-V3 as being affected, but now it turns out many more exciting Arm processor cores are impacted.

Engineers at consulting firm Igalia are exploring NUMA emulation for ARM64 (AArch64) due to the potential of "significant" performance uplift as observed on the popular Raspberry Pi 5 single board computer.

Kernel developer and consultant Johan Hovold spent the last two years working on improving ARM Linux laptop support with a particular focus on the Lenovo ThinkPad X13s powered Qualcomm SoC. Arm funded this Linaro effort and as a result the ThinkPad X13s enjoys pleasant upstream kernel support now. This Arm Linux laptop project has now concluded but sets a nice base for further ARM Linux laptop improvements moving forward.

Arm today announced the latest products in the Armv9 CPU portfolio: the Cortex-X925 as their "ultimate performance" processor and the Cortex-A725 as their processor option for sustained performance.

Merged last week for the Linux 6.10 kernel were all of the 64-bit ARM (ARM64 / AArch64) architecture changes. There is ACPI FACS support, the ability to easily construct FIT images, and a new command-line option for disabling 32-bit application support.

Qualcomm and their partners at Linaro have been busy working on the Linux support for the Snapdragon X Elite as the high-end Arm SoC beginning to roll-out for laptops. The latest Snapdragon X Elite upstreaming is Embedded DisplayPort and DisplayPort support for the Snapdragon X Elite.

The various ARM SoC/platform pull requests were already merged today by Linus Torvalds for the in-development Linux 6.10 kernel.

Merged on Friday to the development codebase for the LLVM/Clang 19 compiler is support for the Arm Neoverse N3, V3, and V3AE SoCs.

The good news is that with the upcoming Linux 6.10 kernel cycle the ARM-based Acer Aspire One laptop will feature "almost full" support for this Qualcomm Snapdragon powered laptop. The downside though it's now a three year old device with far more interesting ARM laptops on the market and more powerful options coming to the market this year.

Queued as part of the ARM64 patches in the various "-next" branches ahead of the Linux 6.10 merge window is a script for being able to build Flat Image Trees (FITs). A Flat Image Tree is the compiled Linux kernel paired with the associated DeviceTree content that is compressed and easily then distributed and executed by capable bootloaders.

Arm China is looking at upstreaming their "Zhouyi" NPU driver into the Linux kernel via the recently-created accelerator "accel" subsystem. The Arm China Neural Processing Unit (NPU) driver in its current form has both an open-source kernel and user-space stack.

The open-source Panthor DRM driver for supporting newer Arm Mali GPUs was queued in drm-misc-next at the start of March ahead of the Linux 6.9 merge window. It ultimately though didn't see a drm-misc-next pull to DRM-Next ahead of the Linux 6.9 merge window and thus being held off until the Linux 6.10 cycle. This week though that drm-misc-next submission to DRM-Next took place as that driver and other changes begin queuing for Linux 6.10.

Following last week's main set of power management updates for Linux 6.9 that saw AMD P-State Preferred Core support and tuning for Intel Meteor Lake, a secondary set of power management subsystem changes were sent out today for this new kernel.

All of the ARM64 (AArch64) feature updates have been merged for the Linux 6.9 kernel. Besides the new SoC and platform hardware support, there are a few ARM64 architecture updates worth pointing out.

The 64-bit Arm (AArch64) little-endian kernel will be ready to support the Rust kernel code with the upcoming Linux 6.9 cycle.

While we are still waiting to get our hands on AmpereOne hardware for Ampere Computing's in-house design Arm cores with up to 192 cores, Friday night Git activity to LLVM has revealed an "Ampere1B" core.

As the first of Arm Mali firmware to be added to the linux-firmware.git repository, the Gen10 Mali "Panthor" firmware has been added as part of the effort on the new open-source Panthor DRM kernel driver currently working its way upstream.

All of the ARM SoC and platform driver changes have been submitted for the Linux 6.8 kernel that include bringing up the latest Qualcomm Snapdragon SoCs, enabling various low-cost gaming handheld console devices, finally upstreaming Google Tensor G1 support, and other hardware additions.

ARM11 MPCore support for the early ARMv6 multi-processor (SMP) support is set to be retired with the upcoming Linux 6.8 kernel cycle.

The upcoming Linux 6.8 kernel cycle will be adding mainline support for several low-cost ARM Linux handheld gaming consoles that are suitable for running retro games, older game emulators, and other lightweight software.

With patches pending for creating an Acer Aspire 1 embedded controller driver, this Qualcomm Snapdragon powered ARM laptop has "almost full support" with the upstream Linux kernel.

All the pieces have been aligned that the mainline Linux 6.8 kernel should be able to boot on the Qualcomm Snapdragon 8 Gen 3 SoC without any out-of-tree patches being necessary.

Ampere Computing has sent out its latest patch attempt at increasing the number of Arm CPU cores supported by the mainline Linux kernel. As it stands at the moment the 64-bit ARM mainline Linux kernel build supports 256 cores, which can be exceeded with Ampere's new AmpereOne processors in a multi-socket configuration.

Microsoft released CBL-Mariner 2.0.20230924 this week as the newest version of their in-house Linux distribution. The driving force behind this release is to get out rebuilt AArch64 packages following the recent GCC security vulnerability that affected Arm 64-bit built software.

The various Arm platform and SoC changes have been submitted for the ongoing Linux 6.6 merge window.

While Ampere Computing's wares with the Altra (Max) and forthcoming AmpereOne families of AArch64 server processors are designed for the data center, if you feel so inclined they have published a guide on being able to run Steam for Linux on these ARM64 processors -- including Steam Play (Proton) for enjoying Windows games on these Linux servers.

While Intel is well known -- and well regarded -- as being one of the top contributors to the Linux kernel as well as being a significant player in many other open-source projects with their countless open-source software contributions over the years, Arm is now trying to better promote their open-source support and open contributions.

A set of 35 patches were posted on Sunday for introducing ARM64 Guarded Control Stack (GCS) support to the Linux kernel. This is akin to x86 Shadow Stack support for hardware-protected stacks of return addresses to help fend off ROP attacks.

The ARM64 (AArch64) architecture code has seen some clean-ups and support for new Arm ISA features with the in-development Linux 6.5 kernel.

Arm and NXP engineers have posted the initial open-source Linux driver patches for an Ethos-U driver for their machine learning processor to enable Linux to dispatch AI inference jobs to the hardware. It's yet another inference/accelerator driver working its way toward the mainline kernel but is off to a rocky start with many code issues being raised.

For helping to ensure optimal performance of AArch64 binaries generated by LLVM/Clang for the Neoverse-V2 processor cores, LLVM 17 Git has received a proper Neoverse-V2 scheduling model.

Arm today announced the new high-end Cortex-X4 CPU core design for delivering their most powerful Cortex compute cluster.

On Monday the ARM64 (AArch64) architecture code changes were submitted for the in-development Linux 6.4 kernel along with the various SoC updates and various platform/machine additions for ARM hardware with this new kernel version.

Toward the end of last year Arm detailed Scalable Matrix Extension 2 (SME2) for adding more capabilities to Armv9-A around speedy matrix processing. Merged this morning is initial support for SME2 within Binutils as part of the GNU compiler toolchain for the GNU Assembler.

In addition to the mainline Linux kernel seeing recent support for the Arm-powered Lenovo ThinkPad X13s and Lenovo Yoga C630, among others, another Lenovo model working toward mainline kernel support is the Lenovo Flex 5G.

Along with all of the Arm SoC and board updates that were merged to the mainline Linux 6.3 kernel earlier in the week, the ARM64 (AArch64) architecture changes have also landed for this next Linux kernel version.

Ahead of the Linux 6.3 merge window officially opening up following the Linux 6.2 stable release tomorrow, Arnd Bergmann has already mailed in his pull requests of the Arm SoC and defconfig updates for this next kernel version. Most notable is having mainline support for the Qualcomm Snapdragon 8 Gen 2 as well as some other new, high-end embedded SoCs.

While initial Scalable Matrix Extension (SME) support for the Linux kernel only was mainlined last year to the kernel tree, Arm already has SME 2 and SME 2.1 support on the way to mainline.

Arm ended out January by publishing an early request for comments (RFC) version of its Confidential Compute Architecture (CCA) support for the Linux kernel so there can be KVM virtualization integration around Arm CCA, a KVM user-space ABI for managing Realms, and Linux guest support for Arm Realms.