From 7e3498ab7c375bd545de501920acffa77eb24120 Mon Sep 17 00:00:00 2001
From: Bruce Ashfield <bruce.ashfield@xilinx.com>
Date: Mon, 16 Dec 2019 20:42:04 -0800
Subject: [PATCH] make-kernel: cross-compilation tweaks

Signed-off-by: Bruce Ashfield <bruce.ashfield@xilinx.com>
---
 kernel/make-kernel | 41 +++++++++++++++++++++++++++++++++--------
 1 file changed, 33 insertions(+), 8 deletions(-)

Index: git/kernel/make-kernel
===================================================================
--- git.orig/kernel/make-kernel
+++ git/kernel/make-kernel
@@ -13,6 +13,7 @@
 
 kernel_stuffdir=`readlink -f kernel`
 kernel_outpath=$kernel_stuffdir/out
+kernel_srcdir=$kernel_stuffdir/src
 kernel_builddir=$kernel_stuffdir/build
 kernel_out=$kernel_outpath/kernel
 
@@ -22,28 +23,52 @@
 kernel_url=https://www.kernel.org/pub/linux/kernel/v5.x/"$kernel_tarball"
 kernel_src_config="$kernel_stuffdir"/cutdown-config."$ARCH"
 kernel_patchesdir="$kernel_stuffdir"/patches
-kernel_image="$kernel_builddir"/"$kernel_name"/arch/"$ARCH"/boot/"$image"
+kernel_image="$kernel_builddir"/arch/"$ARCH"/boot/"$image"
 
+echo "#########################"
+echo "kernel build summary:"
+echo "   version:    $kernel_version"
+echo "   url:        $kernel_url"
+echo "   src dir:    $kernel_srcdir"
+echo "   out dir:    $kernel_builddir"
+echo "   artifacts:  $kernel_out"
+echo "   image:      $image"
+echo "   build vars: $build_vars"
+echo "#########################"
 
-rm -rf $kernel_outpath
+if [ ! -e "$kernel_builddir/.config" ];
+then
+    rm -rf $kernel_buildir
+fi
 mkdir -p $kernel_outpath
 mkdir -p $kernel_builddir
+mkdir -p $kernel_srcdir
 
 if [[ ! -f $kernel_builddir/$kernel_tarball ]]
 then
+    echo "fetching the kernel .."
     wget -O $kernel_builddir/$kernel_tarball --tries=20 $kernel_url
 fi
-if [[ ! -d $kernel_builddir/$kernel_name ]]
+
+if [[ ! -d $kernel_srcdir/$kernel_name ]]
 then
-    tar --extract --xz --touch --file="$kernel_builddir/$kernel_tarball" --directory="$kernel_builddir"
-    cd $kernel_builddir/$kernel_name
+    echo "extracting the kernel ..."
+    echo "  tar --extract --xz --touch --file=\"$kernel_builddir/$kernel_tarball\" --directory=\"$kernel_srcdir\""
+    tar --extract --xz --touch --file="$kernel_builddir/$kernel_tarball" --directory="$kernel_srcdir"
+    cd $kernel_srcdir/$kernel_name
     for i in $kernel_patchesdir/*
     do
         patch -p1 < $i
     done
 fi
-cd $kernel_builddir/$kernel_name
-cp $kernel_src_config .config
-make -j "$(getconf _NPROCESSORS_ONLN)" $image
+if [[ ! -f $kernel_builddir/.config ]]
+then
+    cp $kernel_src_config $kernel_builddir/.config
+fi
+cd $kernel_srcdir/$kernel_name
+
+echo "building the kernel ..."
+eval make O=$kernel_builddir $build_vars oldconfig
+eval make -j "$(getconf _NPROCESSORS_ONLN)" O=$kernel_builddir $build_vars $image
 
 cp $kernel_image $kernel_out