diff --git a/target/linux/realtek/patches-6.12/308-tune-switch-4kec.patch b/target/linux/realtek/patches-6.12/308-tune-switch-4kec.patch
new file mode 100644
index 0000000000..87cd76d462
--- /dev/null
+++ b/target/linux/realtek/patches-6.12/308-tune-switch-4kec.patch
@@ -0,0 +1,24 @@
+From: Markus Stockhausen <markus.stockhausen@gmx.de>
+Date: Fri, 13 Jun 2025 20:25:37 +0100
+Subject: [PATCH] realtek: set mtune 4kec for RTL838x targets
+
+Generic patches will always force the gcc kernel tuning to 34kc. With RTL838x 
+being only 4kec this does not harm but is not right. Match the tuning properly.
+
+Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
+---
+
+--- a/arch/mips/Makefile
++++ b/arch/mips/Makefile
+@@ -164,6 +164,11 @@ cflags-$(CONFIG_CPU_R4X00)	+= $(call cc-
+ cflags-$(CONFIG_CPU_TX49XX)	+= $(call cc-option,-march=r4600,-march=mips3) -Wa,--trap
+ cflags-$(CONFIG_CPU_MIPS32_R1)	+= -march=mips32 -Wa,--trap
+ cflags-$(CONFIG_CPU_MIPS32_R2)	+= -march=mips32r2 -mtune=34kc -Wa,--trap
++
++#ifdef CONFIG_RTL838X
++cflags-$(CONFIG_CPU_MIPS32_R2) := $(subst 34kc,4kec,$(cflags-$(CONFIG_CPU_MIPS32_R2)))
++#endif
++
+ cflags-$(CONFIG_CPU_MIPS32_R5)	+= -march=mips32r5 -Wa,--trap -modd-spreg
+ cflags-$(CONFIG_CPU_MIPS32_R6)	+= -march=mips32r6 -Wa,--trap -modd-spreg
+ cflags-$(CONFIG_CPU_MIPS64_R1)	+= -march=mips64 -Wa,--trap
diff --git a/target/linux/realtek/rtl838x/target.mk b/target/linux/realtek/rtl838x/target.mk
index e776676f66..508298c327 100644
--- a/target/linux/realtek/rtl838x/target.mk
+++ b/target/linux/realtek/rtl838x/target.mk
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 ARCH:=mips
 SUBTARGET:=rtl838x
-CPU_TYPE:=4kec
+CPU_TYPE:=24kc
 BOARD:=realtek
 BOARDNAME:=Realtek MIPS RTL838X