diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -14,6 +14,16 @@ Releases 4.5.x and 4.6.x are based on mainline support submitted in
 
 ## [Unreleased]
 
+## [v4.6.6] - 2018-01-31
+### Changed
+- Updated SeaBIOS to 1.11.0.3
+
+### Fixed
+- memtest86+ screen refresh for serial
+
+### Added
+- enabled ATA UDMA in SeaBIOS
+
 ## [v4.6.5] - 2017-12-29
 ### Added
 - Apu features default values to `bootorder_def` file
@@ -140,7 +150,8 @@ redundant code which was similar for APU2/3/5 boards.
 - turn off D4 and D5 leds on boot
 - enable power on after power failure
 
-[Unreleased]: https://github.com/pcengines/coreboot/compare/v4.6.5...coreboot-4.6.x
+[Unreleased]: https://github.com/pcengines/coreboot/compare/v4.6.6...coreboot-4.6.x
+[v4.6.6]: https://github.com/pcengines/coreboot/compare/v4.6.5...v4.6.6
 [v4.6.5]: https://github.com/pcengines/coreboot/compare/v4.6.4...v4.6.5
 [v4.6.4]: https://github.com/pcengines/coreboot/compare/v4.6.3...v4.6.4
 [v4.6.3]: https://github.com/pcengines/coreboot/compare/v4.6.2...v4.6.3

diff --git a/configs/pcengines_apu2.config b/configs/pcengines_apu2.config
@@ -17,7 +17,7 @@ CONFIG_COMPILER_GCC=y
 # CONFIG_UTIL_GENPARSER is not set
 CONFIG_COMPRESS_RAMSTAGE=y
 CONFIG_INCLUDE_CONFIG_FILE=y
-CONFIG_COLLECT_TIMESTAMPS=y
+# CONFIG_COLLECT_TIMESTAMPS is not set
 CONFIG_USE_BLOBS=y
 # CONFIG_COVERAGE is not set
 # CONFIG_UPDATE_IMAGE is not set

diff --git a/configs/pcengines_apu3.config b/configs/pcengines_apu3.config
@@ -17,7 +17,7 @@ CONFIG_COMPILER_GCC=y
 # CONFIG_UTIL_GENPARSER is not set
 CONFIG_COMPRESS_RAMSTAGE=y
 CONFIG_INCLUDE_CONFIG_FILE=y
-CONFIG_COLLECT_TIMESTAMPS=y
+# CONFIG_COLLECT_TIMESTAMPS is not set
 CONFIG_USE_BLOBS=y
 # CONFIG_COVERAGE is not set
 # CONFIG_UPDATE_IMAGE is not set

diff --git a/configs/pcengines_apu4.config b/configs/pcengines_apu4.config
@@ -17,7 +17,7 @@ CONFIG_COMPILER_GCC=y
 # CONFIG_UTIL_GENPARSER is not set
 CONFIG_COMPRESS_RAMSTAGE=y
 CONFIG_INCLUDE_CONFIG_FILE=y
-CONFIG_COLLECT_TIMESTAMPS=y
+# CONFIG_COLLECT_TIMESTAMPS is not set
 CONFIG_USE_BLOBS=y
 # CONFIG_COVERAGE is not set
 # CONFIG_UPDATE_IMAGE is not set

diff --git a/configs/pcengines_apu5.config b/configs/pcengines_apu5.config
@@ -17,7 +17,7 @@ CONFIG_COMPILER_GCC=y
 # CONFIG_UTIL_GENPARSER is not set
 CONFIG_COMPRESS_RAMSTAGE=y
 CONFIG_INCLUDE_CONFIG_FILE=y
-CONFIG_COLLECT_TIMESTAMPS=y
+# CONFIG_COLLECT_TIMESTAMPS is not set
 CONFIG_USE_BLOBS=y
 # CONFIG_COVERAGE is not set
 # CONFIG_UPDATE_IMAGE is not set

diff --git a/payloads/external/Memtest86Plus/Makefile b/payloads/external/Memtest86Plus/Makefile
@@ -15,7 +15,7 @@
 
 TAG-$(CONFIG_MEMTEST_MASTER)=origin/master
 NAME-$(CONFIG_MEMTEST_MASTER)=Master
-TAG-$(CONFIG_MEMTEST_STABLE)=08dd5879f6518f79969be0cc96fc180e4293b90c
+TAG-$(CONFIG_MEMTEST_STABLE)=485c4fd363fe8570b3da9f0cc5dacf20e1c40cbc
 NAME-$(CONFIG_MEMTEST_STABLE)=Stable
 
 project_name=Memtest86+

diff --git a/payloads/external/SeaBIOS/Kconfig b/payloads/external/SeaBIOS/Kconfig
@@ -5,7 +5,7 @@ choice
 	default SEABIOS_STABLE
 
 config SEABIOS_STABLE
-	bool "1.11.0.2"
+	bool "1.11.0.3"
 	help
 	  Stable SeaBIOS version
 config SEABIOS_MASTER

diff --git a/payloads/external/SeaBIOS/Makefile b/payloads/external/SeaBIOS/Makefile
@@ -1,5 +1,5 @@
 TAG-$(CONFIG_SEABIOS_MASTER)=origin/master
-TAG-$(CONFIG_SEABIOS_STABLE)=rel-1.11.0.2
+TAG-$(CONFIG_SEABIOS_STABLE)=rel-1.11.0.3
 TAG-$(CONFIG_SEABIOS_REVISION)=$(CONFIG_SEABIOS_REVISION_ID)
 
 project_git_repo=https://github.com/pcengines/seabios.git
@@ -75,6 +75,11 @@ endif
 	echo "# CONFIG_USB_OHCI is not set" >> seabios/.config
 	echo "# CONFIG_USB_XHCI is not set" >> seabios/.config
 	echo "# CONFIG_LPT is not set" >> seabios/.config
+#
+# Enable UDMA to speed up booting
+#
+	echo "CONFIG_ATA_DMA=y" >> seabios/.config
+	echo "CONFIG_ATA_PIO32=y" >> seabios/.config
 
 	# This shows how to force a previously set .config option *off*
 	#echo "# CONFIG_SMBIOS is not set" >> seabios/.config