build-kernel.sh

#!/bin/bash -ex
# Based on work by github.com/Lochnair

BUILD_ROOT="/usr/src/build"
SRC_ROOT="/usr/src/sources"

# Download source archives
mkdir -p $BUILD_ROOT/binutils $BUILD_ROOT/gcc $SRC_ROOT
cd /usr/src
wget -nv \
	https://github.com/MarvellEmbeddedProcessors/Octeon-Toolchain/raw/master/toolchain-build-54.tar.bz2

# Extract source archives
cd $SRC_ROOT
tar -xvf ../toolchain-build-54.tar.bz2

# Move sources
mv -v toolchain/gits/binutils .
mv -v toolchain/gits/gcc .
mv -v toolchain/src/gmp .
mv -v toolchain/src/mpc .
mv -v toolchain/src/mpfr .

# Create symlinks to GCC dependencies
cd $SRC_ROOT/gcc
ln -s ../gmp gmp
ln -s ../isl isl
ln -s ../mpc mpc
ln -s ../mpfr mpfr

# Binutils
cd $BUILD_ROOT/binutils
$SRC_ROOT/binutils/configure --prefix=/opt/cross --target=mips64-octeon-linux --disable-multilib --disable-werror
make -j$(nproc)
make install

# GCC - stage 1
cd $BUILD_ROOT/gcc
MAKEINFO=missing $SRC_ROOT/gcc/configure --prefix=/opt/cross --target=mips64-octeon-linux --disable-fixed-point --disable-multilib --disable-sim --enable-languages=c --with-abi=64 --with-float=soft --with-mips-plt
make -j$(nproc) all-gcc
make install-gcc

# Download/Build kernel
mkdir /build
cd /build
curl -o src.tar.bz2 https://dl.ui.com/unifi/firmware/UGW4/$1/GPL.UGW4.v$1.tbz2
tar -xf src.tar.bz2 --wildcards 'source/kernel_*' --strip-components 1
mv kernel_* kernel.tar.gz
tar -xf kernel.tar.gz --strip-components 1
 ./scripts/config  --enable CONFIG_SCSI_MOD
 ./scripts/config  --enable CONFIG_SCSI
 ./scripts/config  --enable CONFIG_BLK_DEV_SD
 ./scripts/config  --enable CONFIG_USB_STORAGE
make -j4 ARCH=mips CROSS_COMPILE=mips64-octeon-linux- prepare modules_prepare
make -j4 ARCH=mips CROSS_COMPILE=mips64-octeon-linux- vmlinux