Freaks City

Prerequisites This guide covers setting up the development environment for the Ai-M61-32S development board (which shares the same main chip as the Ai-M6X series) on a Windows 10 system. Installing Visual Studio Code Download VSCode from the official website: Visit code.visualstudio.com Download the Windows installer (.exe) Run the installer a ...

RISC-V SV39 Page Table Mechanics In traditional operating system designs, transferring data between user space and kernel space requires software-based page table traversal (e.g., copyin and copyout). This software approach simulates the three-level page table walk, which is inherently slower than utilizing the hardware Memory Management Unit ( ...

Automating Execution Environments In systems programming projects involving emulators like NEMU (Non-Architecture-based Machine Emulator), developers often face repetitive manual input when launching test cases. While interactive debugging tools (such as sdb) require user intervention, automated regression testing should not depend on manual ke ...

Modern applications rely on complex execution environments—ranging from standard libraries to operating systems—to manage resources and hardware interactions. To build a kernel from scratch, one must strip away these abstractions and interface directly with the CPU and memory. This process involves navigating the target platform's architecture, ...

Overview This guide covers setting up a differential testing environment where: QEMU serves as the reference implementation (REF) NEMU serves as the device under test (DUT) Test environment: Ubuntu 18.04.5 LTS Building NEMU First, install the required dependencies: apt install build-essential man gcc gdb git libreadline-dev libsdl2-dev zstd l ...

Logging Execution Traces QEMU Logging Enable instruction logging in QEMU with these launch parameters: -d in_asm -D ./qemu.log For additional CPU register output, include the cpu parameter: -d in_asm,cpu. NEMU Logging Configure NEMU during compilation via make menuconfig: Testing and Debugging -> [*] Enable debug features: instruction traci ...

Memory Layout and Page Table Management Hardware Device Mapping Hardware devices like UART0 (0x10000000L), VIRTIO0, CLINT, and PLIC have fixed physical addresses and interrupt numbers defined by hardware design. The kernel uses these addresses to communicate with devices, initialize registers, and handle interrupts. Kernel Loading and Execution ...

Development Board Setup System Installation The Debian system (20230920 version) was selected for the LicheePi 4A. The installation process involves: Using burn_tools.zip for flashing Modifying the burn_lpi4a.bat file path to point to the downloaded image Disabling driver signature enforcement in Windows 10 for successful driver installation ...