Resizeable Bar Support on the Raspberry Pi
10 days ago
- #Linux Kernel
- #GPU Optimization
- #Raspberry Pi
- Resizable BAR support enhances GPU performance on Linux by allowing larger data transfers over the PCIe bus.
- Raspberry Pi 5 lacks default Resizable BAR support, causing issues with Intel Xe GPU drivers.
- Debugging revealed a method to enable Resizable BAR on Pi OS, involving manual configuration and kernel patches.
- Steps include setting a BAR size, blacklisting the Xe driver, and modifying system files.
- A systemd service was created to automate the BAR resizing process on boot.
- Full Intel eGPU support on Raspberry Pi is nearing completion, with AMD eGPUs already stable.
- Experiments with larger BAR sizes (e.g., 16GB) encountered errors, possibly due to hardware limitations.