例如,Arm 的Cortex-M系列配备了 CPU 级内存保护单元 (MPU) [14, 15],而较新的 Armv8-M 则进一步为 Cortex-M MCU 赋予了TrustZone(即额外的 CPU 级控制器,例如安全属性单元 (SAU))[16, 15]。与此同时,主要受实时汽车需求的驱动,Arm 一直在推动Armv8-R架构的发展,该架构已包含通过双级 MPU 实现的硬件...
接触RISC-V有半年了,从最初的qemu模拟,切换到开发板赛防Unmatched,再后来,有了Nezha D1,再后来有了LicheeRV Dock,最近又入手了两块ARM板子,分别是Amlogic的S90513a(移动魔百和)和友善的NanoPC T4,结合自己之前的树莓派1B+,想拿来对比测试一下性能,起初打算用lmbench(Debian及Ubuntu的各个软件源均有销售)来测...
The realtime scheduler could also be a cause of reduced performance in a comparison with Linux benchmarks. I agree that this could impact benchmark results somewhat, but I don't think it fully explains the difference here, especially since the difference I saw in the for loop tests was bef...
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The Radxa ROCK 5 ITX motherboard can be purchasedon AliExpress for $98.37 to $237.47depending on RAM capacity, and the heatsinkadds a little over $5. The Jupiter RISC-V motherboard can be found onArace for $59.99 and up, but is currently sold out. That means reproducing the Arm setup...
The RISC-V definition matches the behavior of the x86 and ARM fused multiply-add instructions, but unfortunately the RISC-V FNMSUB and FNMADD instruction names are swapped as compared to x86, whereas the RISC-V FMSUB and FNMSUB instruction names are swapped as compared to ARM. ima...
ARM64 DTS updates SM8250 – Main pinctrl/gpio block (TLMM), I2C and SPI controllers, the CPU subsytem watchdog, inter-processor signalling controller (IPCC), always-on power/clock controller (AOSS), inter-processor state machine (SMP2P), defines remoteproc controls ...
Hardware-supported trace interfaces like Intel PT and ARM ETM are commonly designed for offline analysis and offer detailed runtime insights [36], [37], [38]. While the traces are generated at program runtime, their analysis can be performed later (i.e., offline). Additional processing is ...
ARM11 vs STM32H7 is a really good comparison between MPU vs MCU. STM32H7 has 480MHz specs and is likely the more "powerful" core (despite using less watts). But when it comes to multi-user multithreaded envrionments, Older ARM11 have those important MPU-ish features like expa...
computer designers have a common goal: to find a language that makes it easy to build the hardware and the compiler while maximizing performance and minimizing cost and energy. This goal is time-honored; the following quote was written before you could buy a computer, and it is as true toda...