eivindbohler / tinyllama-bios

ROM / BIOS for the TinyLlama retro computer

TinyLlama BIOS

This repo contains the tools necessary to build the TinyLlama BIOS (Coreboot/SeaBIOS).
Based on the 86Duino project from https://github.com/roboard/build-coreboot

Tested on:

• Ubuntu 16.04 i386
• macOS Big Sur x86_64
• macOS Monterey x86_64 and arm64

Other operating systems and architectures are probably easy to get working as well, but your mileage may vary.

Prerequisites

Ubuntu

Install various tools:

$ sudo apt install git build-essential m4 bison flex python texinfo gnat

macOS (x86_64)

For Apple Silicon (arm64) CPUs, look here.

1. Install Homebrew:

$ /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

2. Install gcc version 6:

$ brew install gcc@6
$ ln -s /usr/local/bin/gcc-6 /usr/local/bin/gcc
$ ln -s /usr/local/bin/g++-6 /usr/local/bin/g++

3. Install gnu-tar and wget:

$ brew install gnu-tar wget

Build cross compiler

$ ./build-xgcc.sh

Build the ROM file

$ make

If building is successful, the 1 MB output ROM file will be in the out/ directory. Another file is also made - out/xxx-padded.rom - padded with 0xFF to fit 8 MB, for flashing directly to the SPI ROM using a hardware programmer. The Coreboot/SeaBIOS ROM will be located at the end of this 8 MB file.

tinyllama-bios's Issues

Crossbar documentation

Is there any documentation available on how you generated or modified the crossbar .bin file used in the BIOS? The only information I've been able to find online refers to an "SocCfgTool" that doesn't seem to be publicly available.