Author: System on Chips

ARM Cortex-A53 NEON and FPU Optimization Challenges with GCC The ARM Cortex-A53 is a widely used 64-bit processor core that is part of the ARMv8-A architecture. It is commonly employed in embedded systems and applications requiring high efficiency and performance. One of the key features of the Cortex-A53 is its support for Advanced SIMD (NEON)…

BusFault Triggered by Invalid Pointer Dereference During System Initialization The core issue revolves around a BusFault occurring during system power-up, specifically when dereferencing a pointer (*pp_data) in the function uarte_get_async_data. The fault manifests as an access to an invalid memory address (0x0601235d), which is not a valid memory location for the system. This fault is…

ARM Cortex-M Linux Kernel Boot Failure in STM32MP157 The core issue revolves around attempting to run a Linux kernel on a Cortex-M microcontroller within the STM32MP157 evaluation board, specifically encountering a failure in the __free_pages_bootmem function during kernel initialization. This function is part of the Linux kernel’s memory management subsystem, responsible for freeing pages allocated…

ARM Cortex-M4 Cross-Compiler Memory Allocation Error During Large File Compilation When working with embedded systems, particularly those based on ARM Cortex-M4 processors, developers often rely on cross-compilers to translate high-level code into machine code that can be executed on the target hardware. One common issue that arises during this process is the "out of memory"…

Cortex-A53 FIQ Exception During Bare Metal Boot in init_libc When booting a Cortex-A53 processor in bare metal mode, a Fast Interrupt Request (FIQ) exception can occur during the execution of the init_libc function. This issue is particularly prevalent when using the GCC Linaro 4.9 toolchain with glibc 2.14. The FIQ exception is triggered unexpectedly, leading…

ARM Cortex-M USER Mode Transition Failure Due to Improper CPSR Handling The core issue revolves around the inability to successfully transition from SYSTEM mode to USER mode on an ARM Cortex-M processor. The user has configured the stack pointers for both SYSTEM and USER modes in the linker script and attempted to switch modes using…

ARM Cortex-A7 Library Selection Mismatch with -marm Compilation Flag When compiling for the ARM Cortex-A7 processor using the -marm flag, which instructs the compiler to generate ARM (32-bit) instructions, developers may encounter an unexpected behavior where the -print-libgcc-file-name option returns a Thumb-2 library path instead of an ARM library. This discrepancy arises because the GNU…

ARM Cortex-A9 L2 Cache Parity Errors During Level-2 MMU Page Walks The ARM Cortex-A9 processor, integrated with an ARM PL310 L2 cache controller, is a widely used architecture in embedded systems. However, a critical issue arises when dealing with L2 cache parity errors during Level-2 MMU page walks. This issue manifests as synchronous aborts triggered…

Cache Coherency Challenges in Multi-Core ARM Cortex-A35 Systems In multi-core ARM Cortex-A35 systems, such as the i.MX8DX platform, cache coherency is a critical aspect of ensuring data integrity and consistency across cores. The Cortex-A35 cores (Core 0 and Core 1) share a common L2 cache but maintain separate L1 caches. This architecture introduces complexities when…

DebugMon Handler Not Triggering Despite FPB Configuration The issue revolves around the inability to trigger the DebugMon handler on an ARM Cortex-M4 processor when attempting to set a breakpoint programmatically using the Flash Patch and Breakpoint (FPB) unit. The goal is to configure the FPB to trigger a breakpoint when a specific instruction address is…