The Raspberry Pi 4 can drive up to two displays, with a resolution up to 1080p at a 60Hz refresh rate. At 4K resolution, if you connect two displays then you are limited to a 30Hz refresh rate. You can also drive a single display at 4K with a 60Hz refresh rate: this requires that the display is attached to the HDMI port adjacent to the USB-C power input (labelled HDMI0). You must also enable 4Kp60 output by setting the hdmi_enable_4kp60=1 flag in config.txt.
$ sudo rpi-eeprom-update *** UPDATE AVAILABLE *** BOOTLOADER: update available CURRENT: Thu 3 Sep 12:11:43 UTC 2020 (1599135103) LATEST: Thu 29 Apr 16:11:25 UTC 2021 (1619712685) RELEASE: default (/lib/firmware/raspberrypi/bootloader/default) Use raspi-config to change the release.
VL805_FW: Dedicated VL805 EEPROM VL805: up to date CURRENT: 000138a1 LATEST: 000138a1
Armv9은 지난 2011년 출시한 ARM 최초의 64비트 지원 아키텍처 'Armv8'의 뒤를 잇는 차세대 반도체 IP다. 이는 슈퍼컴퓨터용 명령어 세트인 '스케일러블 벡터 익스텐션2(SVE2)'을 지원해 Armv8 아키텍처 보다 빠른 머신러닝(ML)과 DSP 성능을 구현한다.
Scalable Vector Extension (SVE) is the next-generation SIMD extension of the Arm v8-A AArch64 instruction set. SVE is not an extension of Neon, but a new set of vector instructions that are developed to target HPC workloads. SVE enables vectorization of loops which would either be impossible or not beneficial to vectorize with Neon .
Unlike other SIMD architectures, SVE can be Vector Length Agnostic (VLA). SVE does not fix the size of the vector registers which allows hardware implementors to choose the size that is best for their workloads.
ARMv8.2-A의 선택사양? 아무튼 SVE2가 중요한게 아니라 SVE가 머냐가 문제인가..
The Scalable Vector Extension (SVE) is "an optional extension to the ARMv8.2-A architecture and newer" developed specifically for vectorization ofhigh-performance computingscientific workloads.