Introduce meta-rockchip-extra to apply serial baud rate patches

I don't have a USB to serial converter that works with the default baud rate.

7 files changed, 80 insertions, 0 deletions

diff --git a/meta-rockchip-extra/conf/layer.conf b/meta-rockchip-extra/conf/layer.conf
new file mode 100644
index 0000000..4205b3b
--- /dev/null
+++ b/meta-rockchip-extra/conf/layer.conf
@@ -0,0 +1,14 @@
+BBPATH .= ":${LAYERDIR}"
+
+BBFILES += "\
+    ${LAYERDIR}/recipes-*/*/*.bb \
+    ${LAYERDIR}/recipes-*/*/*.bbappend \
+"
+
+BBFILE_COLLECTIONS += "rockchip-extra-layer"
+BBFILE_PATTERN_rockchip-extra-layer = "^${LAYERDIR}/"
+BBFILE_PRIORITY_rockchip-extra-layer = "2"
+
+LAYERDEPENDS_rockchip-extra-layer += "rockchip"
+
+LAYERSERIES_COMPAT_rockchip-extra-layer = "whinlatter"
diff --git a/meta-rockchip-extra/recipes-bsp/u-boot/files/0001-set-serial2-baudrate-to-115200.patch b/meta-rockchip-extra/recipes-bsp/u-boot/files/0001-set-serial2-baudrate-to-115200.patch
new file mode 100644
index 0000000..61ea8ac
--- /dev/null
+++ b/meta-rockchip-extra/recipes-bsp/u-boot/files/0001-set-serial2-baudrate-to-115200.patch
@@ -0,0 +1,28 @@
+From e25377d919889cc4ccc6b21a86e8b0dadbc422cf Mon Sep 17 00:00:00 2001
+From: unitexe <unitexe70@gmail.com>
+Date: Sat, 21 Feb 2026 11:00:05 -0600
+Subject: [PATCH] set serial2 baudrate to 115200
+
+I don't have a USB/serial adapter that supports 1500000
+
+Upstream-Status: Inappropriate [embedded-specific]
+---
+ dts/upstream/src/arm64/rockchip/rk3566-radxa-zero-3.dtsi | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/dts/upstream/src/arm64/rockchip/rk3566-radxa-zero-3.dtsi b/dts/upstream/src/arm64/rockchip/rk3566-radxa-zero-3.dtsi
+index 1ee5d96a46a..244f36aab84 100644
+--- a/dts/upstream/src/arm64/rockchip/rk3566-radxa-zero-3.dtsi
++++ b/dts/upstream/src/arm64/rockchip/rk3566-radxa-zero-3.dtsi
+@@ -7,7 +7,7 @@
+ 
+ / {
+ 	chosen {
+-		stdout-path = "serial2:1500000n8";
++		stdout-path = "serial2:115200n8";
+ 	};
+ 
+ 	hdmi-con {
+-- 
+2.43.0
+
diff --git a/meta-rockchip-extra/recipes-bsp/u-boot/u-boot_%.bbappend b/meta-rockchip-extra/recipes-bsp/u-boot/u-boot_%.bbappend
new file mode 100644
index 0000000..47b06fa
--- /dev/null
+++ b/meta-rockchip-extra/recipes-bsp/u-boot/u-boot_%.bbappend
@@ -0,0 +1,3 @@
+FILESEXTRAPATHS:prepend := "${THISDIR}/files:"
+
+SRC_URI:append = " file://0001-set-serial2-baudrate-to-115200.patch"
diff --git a/meta-rockchip-extra/recipes-kernel/linux/files/0001-set-serial2-baudrate-to-115200.patch b/meta-rockchip-extra/recipes-kernel/linux/files/0001-set-serial2-baudrate-to-115200.patch
new file mode 100644
index 0000000..8c1f998
--- /dev/null
+++ b/meta-rockchip-extra/recipes-kernel/linux/files/0001-set-serial2-baudrate-to-115200.patch
@@ -0,0 +1,28 @@
+From f18dfae5c9f1cca1b0404d90a72293696ab39ed1 Mon Sep 17 00:00:00 2001
+From: unitexe <unitexe70@gmail.com>
+Date: Sat, 21 Feb 2026 11:05:04 -0600
+Subject: [PATCH] set serial2 baudrate to 115200
+
+I don't have a USB/serial adapter that supports 1500000
+
+Upstream-Status: Inappropriate [embedded-specific]
+---
+ arch/arm64/boot/dts/rockchip/rk3566-radxa-zero-3.dtsi | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/arch/arm64/boot/dts/rockchip/rk3566-radxa-zero-3.dtsi b/arch/arm64/boot/dts/rockchip/rk3566-radxa-zero-3.dtsi
+index 1ee5d96a46a1..244f36aab84a 100644
+--- a/arch/arm64/boot/dts/rockchip/rk3566-radxa-zero-3.dtsi
++++ b/arch/arm64/boot/dts/rockchip/rk3566-radxa-zero-3.dtsi
+@@ -7,7 +7,7 @@
+ 
+ / {
+ 	chosen {
+-		stdout-path = "serial2:1500000n8";
++		stdout-path = "serial2:115200n8";
+ 	};
+ 
+ 	hdmi-con {
+-- 
+2.43.0
+
diff --git a/meta-rockchip-extra/recipes-kernel/linux/linux-yocto_%.bbappend b/meta-rockchip-extra/recipes-kernel/linux/linux-yocto_%.bbappend
new file mode 100644
index 0000000..47b06fa
--- /dev/null
+++ b/meta-rockchip-extra/recipes-kernel/linux/linux-yocto_%.bbappend
@@ -0,0 +1,3 @@
+FILESEXTRAPATHS:prepend := "${THISDIR}/files:"
+
+SRC_URI:append = " file://0001-set-serial2-baudrate-to-115200.patch"
diff --git a/meta-unit-kas/images/poky/radxa-zero-3e/core-image-base/whinlatter.yml b/meta-unit-kas/images/poky/radxa-zero-3e/core-image-base/whinlatter.yml
index dde6565..d3e705c 100644
--- a/meta-unit-kas/images/poky/radxa-zero-3e/core-image-base/whinlatter.yml
+++ b/meta-unit-kas/images/poky/radxa-zero-3e/core-image-base/whinlatter.yml
@@ -24,3 +24,6 @@ repos:
       meta-arm-toolchain:
       meta-arm:
       meta-arm-bsp:
+  meta-unit:
+    layers:
+      meta-rockchip-extra:
diff --git a/meta-unit-kas/images/unit-poky/radxa-zero-3e/core-image-unit/whinlatter.yml b/meta-unit-kas/images/unit-poky/radxa-zero-3e/core-image-unit/whinlatter.yml
index 8bd6091..df704bd 100644
--- a/meta-unit-kas/images/unit-poky/radxa-zero-3e/core-image-unit/whinlatter.yml
+++ b/meta-unit-kas/images/unit-poky/radxa-zero-3e/core-image-unit/whinlatter.yml
@@ -37,6 +37,7 @@ repos:
       meta-unit-core:
       meta-unit-distro:
       meta-unit-profiling:
+      meta-rockchip-extra:
       meta-unit-users:
       meta-unit-virtualization:
       meta-virtualization-extra: