diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 00000000..05a0e946
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+*.xz filter=lfs diff=lfs merge=lfs -text
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..b373575e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "buildroot/linux/linux-5.4.99"]
+	path = buildroot/linux/linux-5.4.99
+	url = https://github.com/YuzukiHD/linux-5.4.99
diff --git a/buildroot/linux/Config.in b/buildroot/linux/Config.in
index f83474e1..974d1bb7 100644
--- a/buildroot/linux/Config.in
+++ b/buildroot/linux/Config.in
@@ -98,6 +98,12 @@ config BR2_LINUX_KERNEL_CUSTOM_SVN
 	help
 	  This option allows Buildroot to get the Linux kernel source
 	  code from a Subversion repository.
+	
+config BR2_LINUX_KERNEL_CUSTOM_LOCAL
+	bool "Local directory"
+	help
+	  This option allows Buildroot to get the Linux kernel source
+	  code from a local directory.
 
 endchoice
 
@@ -109,6 +115,12 @@ config BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION
 	string "URL of custom kernel tarball"
 	depends on BR2_LINUX_KERNEL_CUSTOM_TARBALL
 
+config BR2_LINUX_KERNEL_CUSTOM_LOCAL_PATH
+	string "Path to the local directory"
+	depends on BR2_LINUX_KERNEL_CUSTOM_LOCAL
+	help
+	  Path to the local directory with the Linux kernel source code.
+
 if BR2_LINUX_KERNEL_CUSTOM_GIT || BR2_LINUX_KERNEL_CUSTOM_HG || BR2_LINUX_KERNEL_CUSTOM_SVN
 
 config BR2_LINUX_KERNEL_CUSTOM_REPO_URL
@@ -136,6 +148,7 @@ config BR2_LINUX_KERNEL_VERSION
 	default "custom" if BR2_LINUX_KERNEL_CUSTOM_TARBALL
 	default BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION \
 		if BR2_LINUX_KERNEL_CUSTOM_GIT || BR2_LINUX_KERNEL_CUSTOM_HG || BR2_LINUX_KERNEL_CUSTOM_SVN
+	default "local" if BR2_LINUX_KERNEL_CUSTOM_LOCAL
 
 #
 # Patch selection
diff --git a/buildroot/linux/linux-5.4.99 b/buildroot/linux/linux-5.4.99
new file mode 160000
index 00000000..90b0fee6
--- /dev/null
+++ b/buildroot/linux/linux-5.4.99
@@ -0,0 +1 @@
+Subproject commit 90b0fee66767e740c2c276e60aaab4dd92f81220
diff --git a/buildroot/linux/linux.mk b/buildroot/linux/linux.mk
index 010ed349..84e6c135 100644
--- a/buildroot/linux/linux.mk
+++ b/buildroot/linux/linux.mk
@@ -34,6 +34,9 @@ LINUX_SITE_METHOD = hg
 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN),y)
 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
 LINUX_SITE_METHOD = svn
+else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_LOCAL),y)
+LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_LOCAL_PATH))
+LINUX_SITE_METHOD = local
 else ifeq ($(BR2_LINUX_KERNEL_LATEST_CIP_VERSION)$(BR2_LINUX_KERNEL_LATEST_CIP_RT_VERSION),y)
 LINUX_SOURCE = linux-cip-$(LINUX_VERSION).tar.gz
 LINUX_SITE = https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git/snapshot