The 64-bit version of the Raspberry Pi OS has reached a stable release and has been in beta testing throughout 2021. The development team wrote in a blog that users can now natively use modern 64-bit software on the company’s branded single-board computers, which previously could only be evaluated by installing a third-party OS. The long-awaited update is based on the Debian 11 Bullseye release and the Linux 5.10 kernel.
The hardware of the Raspberry Pi line was switched to 64-bit processes back in 2016. Hardware received processors on the ARMv8 architecture (AArch64) with the A64 instruction set. Work on the 32-bit Raspberry Pi OS was predominantly continued in order to maximize compatibility between devices, but of course, due to certain merits of the 64-bit version, it could not be delayed for a significant period. There were two key issues: they were application support and resource efficiency limitations.
Many closed source applications are only available for ARM64, while open source applications are not fully optimized for armhf. In addition, there are some performance benefits inherent in the A64 instruction set. Raspberry Pi OS 64-bit also handles more RAM than the 32-bit version – it supports a maximum of 4 GB. For example, in the Raspberry Pi 4 with a 32-bit OS, ARM Large Physical Address Extension (LPAE) technology was used to expand the RAM, allowing access to 8 GB, provided that any process is limited to access to 3 GB (1 GB of virtual address space was reserved for the kernel ).
You can download the 64-bit version of Raspberry Pi OS (Raspbian) from the official website.
Source: Trash Box
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