Author: System on Chips

Python Code Execution Time and Cycle Count Challenges on ARM Cortex-A53 The task of calculating the execution time and cycle count for Python code running on an ARM Cortex-A53 processor, such as the one found in the Raspberry Pi 3B, presents several unique challenges. Unlike compiled languages like C or C++, Python is an interpreted…

ARM A133 SPI Device Probe Failure Due to Memory Allocation Issues The ARM A133 processor, part of the Allwinner sun50iw10p1 family, is a powerful SoC often used in embedded systems for its balance of performance and power efficiency. However, during the kernel boot process, users may encounter an error when probing an SPI device, specifically…

ARM Cortex-A15 Kernel Module Build Failure Due to Missing Symbol The issue at hand involves a failure during the build process of the Open vSwitch (OVS) kernel module on an ARM Cortex-A15 platform running a Linux kernel version 5.4.167-240. The build process terminates with an error indicating that the symbol rpl_geneve_dev_create_fb is undefined. This symbol…

Cortex-M0+ Delay Routine Inaccuracy Due to Instruction Cycle Miscalculation The Cortex-M0+ is a popular choice for low-power, cost-sensitive embedded systems due to its simplicity and efficiency. However, its lack of advanced features like the Data Watchpoint and Trace (DWT) unit, which includes the cycle counter (CYCCNT), makes implementing precise delays more challenging. In this scenario,…

ARM TrustZone World Switching and Cache Coherency Issues ARM TrustZone technology provides a secure execution environment by partitioning the system into Secure and Normal (Non-secure) worlds. This partitioning extends to memory, peripherals, and even CPU states. However, one of the most critical challenges in TrustZone implementations is maintaining cache coherency during world switches. When the…

ARM AHB5 Protocol and HADDR Bus Width Evolution The Advanced High-performance Bus (AHB) protocol, developed by Arm, is a cornerstone of many System-on-Chip (SoC) designs, particularly in embedded systems. AHB is part of the Advanced Microcontroller Bus Architecture (AMBA) family and is widely used for high-performance communication between processors, memory controllers, and peripherals. One of…

NEON Operations and FPU Interrupt Behavior in ARM Cortex Processors The ARM architecture, particularly in its Cortex series processors, integrates advanced SIMD (Single Instruction, Multiple Data) capabilities through the NEON engine, alongside traditional Floating-Point Unit (FPU) operations. A critical aspect of these operations is their interaction with the processor’s interrupt mechanism. Understanding whether NEON operations…

ARM Processors in High-Performance Computing and Desktop Environments: Current Landscape The adoption of ARM processors in high-performance computing (HPC) and general desktop use has been a topic of significant interest and debate. ARM architectures, known for their energy efficiency and scalability, have made substantial inroads into domains traditionally dominated by x86 processors. However, the transition…

ARM Cortex-M7 Unaligned Access Fault During memcpy Operation The issue at hand involves an unaligned usage fault occurring on an ARM Cortex-M7 processor during a memcpy operation. The memcpy function is used to copy data from the Backup SRAM (BKPSRAM) region to the SRAM1 region. This operation works flawlessly on a Cortex-M4 but triggers an…

SysTick Interrupt Configuration and NVIC Priority Settings The core issue revolves around the SysTick interrupt not triggering on an ARM Cortex-M0 processor integrated into the PGA970 system. The SysTick timer is a fundamental peripheral in ARM Cortex-M processors, often used for generating periodic interrupts for task scheduling or timekeeping. However, in this case, despite proper…