diff --git a/Makefile b/Makefile
index 1e5e401..004bb71 100644
--- a/Makefile
+++ b/Makefile
@@ -27,6 +27,10 @@ watch:
 udefconfig:
 	make -C ./u-boot-brain pwsh1_defconfig
 
+.PHONY:
+udefconfig-%:
+	make -C ./u-boot-brain pw$*_defconfig
+
 .PHONY:
 usavedefconfig:
 	make -C ./u-boot-brain savedefconfig
diff --git a/README.md b/README.md
index 10de12d..e34301f 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,10 @@ Getting Started
 Build and inject U-Boot
 -----------------------
 
-1. Run `make udefconfig` to generate `.config`.
+1. Run `make udefconfig-sh*` to generate `.config`.
+
+    - For Sx1: `make udefconfig-sh1`
+    - For Sx6: `make udefconfig-sh6`
 
 2. Run `make ubuild` to build whole repository and generate `u-boot.sb`.
 
diff --git a/u-boot-brain b/u-boot-brain
index 260d3d8..8ca2fd0 160000
--- a/u-boot-brain
+++ b/u-boot-brain
@@ -1 +1 @@
-Subproject commit 260d3d81a9ec16e4f1126316e952d0a82aad3cf0
+Subproject commit 8ca2fd02bf72ceeff2fa917b1cbdb48da7ff19ed