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Kristina Brooks 2016-05-16 04:08:38 +01:00
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# Minimal Raspberry Pi VPU firmware
This is a small firmware for RPi VPU (VideoCore4) versions 1/2/3 that is capable of initializing UART, VPU PLL (PLLC) and ARM itself. It's intended to be used instead of stock `bootcode.bin` on RPi's SD card. You **need** to have UART to see anything meaningful as far as output goes.
This is a small firmware for RPi VPU (VideoCore4) versions 1/2/3 that is capable of initializing VPU PLL (PLLC), UART, SDRAM and ARM itself. It's intended to be used instead of stock `bootcode.bin` on RPi's SD card. You **need** to have UART to see anything meaningful as far as output goes.
This has been tested on RPi1 Model B (Hynix PoP DDR), RPi 2 Model B and RPi 3 Model B (both Elpida DDR).
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## Thanks To
* **Herman Hermitage** for his VC4 documentation and for helping me with working out suitable ARM PLL configurations.
* **Julian Brown** for reviewing my code and for his awesome VC4 toolchain.
* **David Given** for his initial LLVM project which I used as the base for my LLVM toolchain before moving to GCC.
* **phire** for reviewing my code.
* **Broadcom** for their header release.
* Various other people not mentioned here.