rpi-open-firmware: open-source VPU side bootloader for Raspberry Pi

Re:rpi-open-firmware: open-source VPU side bootloader for Ra... by TickleSteve on Thursday February 25, 2021 @03:49AM (#26260981)

You can do bare-metal on the RPi also, you don't have to use a (non-realtime) OS like Linux which is where your latency issues come from. You can treat the RPi as a microcontroller and program it via JTAG, etc if you like. Latency issues come from the OS, not the hardware.

[ Parent | on HN ]

Re:rpi-open-firmware: open-source VPU side bootloader for Ra... by cleverca22 on Thursday February 25, 2021 @12:43PM (#26265615)

yeah, you can either do baremetal arm under the official firmware (quad-core arm, up to 1.8ghz depending on the model)

or you can do baremetal VPU and skip the firmware entirely 500mhz dual-core VPU 128kb of L2 cache for both code and data if you want dram, you need the ram drivers (only present for the VC4 line, pi0-pi3) you could optionally rely on 1 closed stage to bring ram up, and do baremetal VPU from the start(4).elf to avoid the dram init sequence

and if you build upon rpi-open-firmware, you could get all 6 cores baremetal, running custom code

[ Parent | on HN ]