# Table of Contents

1.  [Preface](#org1e835ab)
2.  [Prerequisites](#org906530a)
    1.  [Using the riscv toolchain provided via crossdev](#org81f210c)
    2.  [Using a precompiled toolchain](#orgcee506a)
3.  [Clone & Build Heart Software Services (HSS)](#orgcf597f6)
    1.  [Clone HSS](#org457b83e)
    2.  [Build HSS](#org3e3a28d)
4.  [Clone & Build u-boot](#orgf0e36bd)
    1.  [Clone u-boot](#org8956801)
    2.  [Download the patches](#org93d8740)
    3.  [Build u-boot](#org6208aac)
5.  [Build the Linux kernel](#org9277169)
6.  [Generate the HSS payload](#org48e5afc)
7.  [Gentoo](#orgdc16ac3)



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# Preface

This guide is written in a way that forces the reader to manually perform every step, excluding environment variables via the setup script because I want to be able to change those. If you would like to follow the official guide provided by beagleboard, which is far more streamlined and automated, please see the references at the bottom of this document.


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# Prerequisites

    emerge -a sys-block/bmap-tools sys-fs/genimage dev-libs/libyaml sys-fs/mtools
    mkdir beaglev-fire-gentoo && cd beaglev-fire-gentoo
    # deploy will contain any output files, images, etc
    mkdir deploy


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## Using the riscv toolchain provided via crossdev

Crossdev is required for this step. If you don&rsquo;t have crossdev set up, use [this](https://wiki.gentoo.org/wiki/Crossdev) guide to install it. At the time of writing this installs riscv64-unknown-linux-gnu-gcc 13.2.1. This is note worthy because the official guide uses 11.4. If there are issues with this toolchain, use the precompiled toolchain via [these steps](#orgcee506a).

    crossdev -t riscv64-unknown-linux-gnu
    export RISCV64_CC="riscv64-unknown-linux-gnu-"


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## Using a precompiled toolchain

    mkdir mirror
    mkdir toolchain
    export GCC_VERSION=11.4.0
    wget -c --directory-prefix=./mirror/ "https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/${GCC_VERSION}/x86_64-gcc-${GCC_VERSION}-nolibc-riscv64-linux.tar.xz"
    
    tar xvf ./mirror/x86_64-gcc-${GCC_VERSION}-nolibc-riscv64-linux.tar.xz --strip-components=2 -C ./toolchain/
    export RISCV64_CC="$PWD/toolchain/bin/riscv64-linux-"

From this point forward, instructions will use the `RISCV64_CC` variable as the toolchain.

Export some other misc. environment variables:

    export HSS_BRANCH="v2023.02"
    export HSS_REPO="https://github.com/polarfire-soc/hart-software-services.git"
    export UBOOT_BRANCH="linux4microchip+fpga-2023.02"
    export UBOOT_REPO="https://github.com/polarfire-soc/u-boot.git"
    export GIT_DEPTH=20
    export CORES=$(getconf _NPROCESSORS_ONLN)


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# Clone & Build Heart Software Services (HSS)


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## Clone HSS

    # remove old if it exists, optional
    if [ -d ./hart-software-services/ ] ; then
    	rm -rf ./hart-software-services/ || true
    fi
    git clone -b ${HSS_BRANCH} ${HSS_REPO} ./hart-software-services/ --depth=${GIT_DEPTH}


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## Build HSS

    make -C hart-software-services/tools/hss-payload-generator/ clean
    make -C hart-software-services/tools/hss-payload-generator/
    cp -v ./hart-software-services/tools/hss-payload-generator/hss-payload-generator ./deploy/


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# Clone & Build u-boot


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## Clone u-boot

    # remove old if it exists, optional
    if [ -d ./u-boot ] ; then
    	rm -rf ./u-boot || true
    fi
    git clone -b ${UBOOT_BRANCH} ${UBOOT_REPO} ./u-boot/ --depth=${GIT_DEPTH}


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## Download the patches

The patches currently exist as part of BeagleV&rsquo;s `BeagleV-Fire-ubuntu` repo, so we&rsquo;ll just clone the whole thing for now. Eventually, I&rsquo;ll see if I can mirror just the patches somewhere.

    git clone https://git.beagleboard.org/beaglev-fire/BeagleV-Fire-ubuntu.git ./beaglev --depth=${GIT_DEPTH}


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## WIP Build u-boot

    # Apply patches to uboot
    cp -v ./patches/u-boot/beaglev-fire/microchip_mpfs_icicle.h ./u-boot/include/configs/microchip_mpfs_icicle.h
    cp -v ./patches/u-boot/beaglev-fire/microchip-mpfs-icicle-kit.dts ./u-boot/arch/riscv/dts/
    cp -v ./patches/u-boot/beaglev-fire/microchip_mpfs_icicle_defconfig ./u-boot/configs/microchip_mpfs_icicle_defconfig
    make -C u-boot ARCH=riscv CROSS_COMPILE=${RISCV64_CC} microchip_mpfs_icicle_defconfig
    # if you want to make configurations....
    # make -C u-boot ARCH=riscv CROSS_COMPILE=${RISCV64_CC} menuconfig
    make -C u-boot ARCH=riscv CROSS_COMPILE=${RISCV64_CC} olddefconfig
    make -C u-boot ARCH=riscv CROSS_COMPILE=${RISCV64_CC} savedefconfig
    cp -v ./u-boot/defconfig ./u-boot/configs/microchip_mpfs_icicle_defconfig
    cp -v ./u-boot/defconfig ./patches/u-boot/beaglev-fire/microchip_mpfs_icicle_defconfig
    make -C u-boot -j${CORES} ARCH=riscv CROSS_COMPILE=${RISCV_CC} all
    # copy the generated uboot into our deploy folder
    cp -v ./u-boot/u-boot.bin ./deploy/
    # i have no idea why 2 copies are being made, one u-boot.bin and one src.bin
    cp -v ./u-boot/u-boot.bin ./deploy/src.bin


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# TODO Build the Linux kernel


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# TODO Generate the HSS payload


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# TODO Gentoo