From 6dc751bd49c7464b46539a200315bec35879b768 Mon Sep 17 00:00:00 2001
From: Cjacker <cjacker@foxmail.com>
Date: Thu, 2 Mar 2023 21:58:03 +0800
Subject: [PATCH 1/2] add old config for make menuconfig, otherwise it will try
 to genenate config from /boot/config-kernelver of host

---
 build.sh | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/build.sh b/build.sh
index 129eda480..37781d3f6 100755
--- a/build.sh
+++ b/build.sh
@@ -35,6 +35,12 @@ build_linux_config()
     echo " "
     echo "============ build linux kernel config ============="
     cd $SHELL_DIR/linux-5.10.4-808
+    # add old config for make menuconfig,
+    # otherwise it will take config from /boot/config-<kernel ver> of host,
+    # and kernel building will fail.
+    if [ ! -f .config ]; then
+        cp c906.config .config
+    fi
     make ARCH=riscv CROSS_COMPILE=$LINUX_CROSS_PREFIX menuconfig -j$(nproc)
 }
 
@@ -153,4 +159,4 @@ all)
 esac
 
 echo " "
-echo "===================== build done ======================="
\ No newline at end of file
+echo "===================== build done ======================="

From e14a00e78e5c0ef619ebe88c3f2b624615b4a3f4 Mon Sep 17 00:00:00 2001
From: Cjacker <cjacker@foxmail.com>
Date: Thu, 2 Mar 2023 22:03:14 +0800
Subject: [PATCH 2/2] if no arg given, show help

---
 build.sh | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/build.sh b/build.sh
index 37781d3f6..0f8a3c244 100755
--- a/build.sh
+++ b/build.sh
@@ -9,7 +9,12 @@ CMAKE=$SHELL_DIR/toolchain/cmake/bin/
 LINUX_CROSS_PREFIX=$SHELL_DIR/toolchain/linux_toolchain/bin/riscv64-unknown-linux-gnu-
 NEWLIB_ELF_CROSS_PREFIX=$SHELL_DIR/toolchain/elf_newlib_toolchain/bin/riscv64-unknown-elf-
 
-BUILD_TARGET=$1
+# if no arg given
+if [ $# -ne 1 ]; then
+	BUILD_TARGET="--help"
+else
+	BUILD_TARGET=$1
+fi
 
 if [[ ! -e $OUT_DIR ]]; then
     mkdir $OUT_DIR