"The other improvement that seemed especially interesting to us was that the OpenBSD TCP/IP stack is now multithreaded. It scales with the number of CPUs in the machine, up to a maximum of eight cores, with one connection handled by one core. This includes some of the more computationally-demanding aspects of IPv6. There's also built-in support for AMD's Secure Encrypted Virtualization tech. This includes OpenBSD's built-in VMM/VMD hypervisor, which can now create and managed SEV-encrypted VMs,"
"Added support for Raspberry Pi 5 (with console on serial port). The emphasis is ours. So, you should be ready to wire up an RS-232 connector to your Pi 5's GPIO connector. There are RS-232 HATs available, and there's a small chance that a USB-to-RS-232 adaptor might work, but we wouldn't rely on it. The code change was committed in September, and mentions other limitations: Booting from PCIe storage HATs doesn't work because of missing U-Boot support."
OpenBSD 7.8 introduces official Raspberry Pi 5 support with the console exposed on the serial port, requiring RS-232 connection for console access. The installer is not for the timid, so dedicating a machine for learning is recommended. Known Raspberry Pi limitations include missing U-Boot support for PCIe storage HATs, nonfunctional WiFi on some boards, and absent PWM/clock drivers for the active cooler. The TCP/IP stack is now multithreaded and scales up to eight cores with one connection per core, including IPv6 workloads. Built-in support for AMD SEV enables SEV-encrypted VMs via OpenBSD's VMM/VMD and use in KVM-hosted SEV guests.
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