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#!/usr/bin/env bash
set -euo pipefail
DIR="$(cd "$(dirname "$0")" && pwd)"
KERNEL_VER="6.19"
KERNEL_URL="https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-$KERNEL_VER.tar.xz"
KERNEL_TAR="linux-$KERNEL_VER.tar.xz"
KERNEL_SRC="$DIR/linux-$KERNEL_VER"
KERNEL_OUT="$DIR/out/kernel"
KERNEL_CFG="$KERNEL_SRC/scripts/config"
mkdir -p "$KERNEL_OUT"
# If no kernel sources are found, grab the release tarball
if [ ! -d "$KERNEL_SRC" ]; then
echo "Kernel sources not found. Downloading a release tarball in 3 seconds..."
sleep 3
echo "Downloading $KERNEL_URL..."
curl -L -o "$DIR/$KERNEL_TAR" "$KERNEL_URL"
echo "Extracting - this can take a little bit..."
tar -xf "$KERNEL_TAR" -C "$DIR"
rm "$DIR/$KERNEL_TAR"
echo "Generating default kernel config..."
make -C "$KERNEL_SRC" O="$KERNEL_OUT" defconfig
fi
echo "Setting kernel config options..."
kenable() { "$KERNEL_CFG" --file "$KERNEL_OUT/.config" --enable "$1"; }
kenable DRM
kenable DRM_FBDEV_EMULATION
kenable DRM_VIRTIO_GPU
kenable FB
kenable FB_VESA
kenable FRAMEBUFFER_CONSOLE
echo "Resolving config dependencies..."
make -C "$KERNEL_SRC" O="$KERNEL_OUT" olddefconfig
echo "Building with $(nproc) threads in 3 seconds..."
sleep 3
make -C "$KERNEL_SRC" O="$KERNEL_OUT" -j "$(nproc)"
echo "Exporting kernel headers..."
make -C "$KERNEL_SRC" O="$KERNEL_OUT" -j "$(nproc)" \
headers_install INSTALL_HDR_PATH="$DIR/out/sysroot/usr"
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