diff --git a/common/recipes-bsp/pflash/pflash.bb b/common/recipes-bsp/pflash/pflash.bb
index 6c2b0b6..5c0cfa4 100644
--- a/common/recipes-bsp/pflash/pflash.bb
+++ b/common/recipes-bsp/pflash/pflash.bb
@@ -6,9 +6,8 @@
 SRC_URI += "git://github.com/open-power/skiboot.git"
 LIC_FILES_CHKSUM = "file://${S}/LICENCE;md5=3b83ef96387f14655fc854ddc3c6bd57"
 
-SRCREV = "skiboot-5.2.0"
-PV = "5.2.0"
-SRC_URI += "file://0001-pflash-Allow-building-under-yocto.patch"
+SRCREV = "skiboot-5.2.1"
+PV = "5.2.1"
 
 S = "${WORKDIR}/git"
 
diff --git a/common/recipes-bsp/pflash/pflash/0001-pflash-Allow-building-under-yocto.patch b/common/recipes-bsp/pflash/pflash/0001-pflash-Allow-building-under-yocto.patch
deleted file mode 100644
index 60d6a7b..0000000
--- a/common/recipes-bsp/pflash/pflash/0001-pflash-Allow-building-under-yocto.patch
+++ /dev/null
@@ -1,98 +0,0 @@
-From bb362203a7cc7012ba723d8828491756f9bb4ecb Mon Sep 17 00:00:00 2001
-From: Patrick Williams <patrick@stwcx.xyz>
-Date: Thu, 14 Apr 2016 10:46:22 -0500
-Subject: [PATCH] pflash: Allow building under yocto.
-
-The makefiles under external/* utilize the $(CROSS_COMPILE) variable
-to determine the cross-compiler prefix.  In a few places,
-$(CROSS_COMPILE)gcc is called instead of $(CC).  The issue with this is
-that yocto build passes some compile flags as part of $(CC) instead of
-$(CFLAGS), the most important of these is '--sysroot=...'.  Without the
-proper --sysroot flag, pflash compile fails to find critical libc
-headers like stdio.h.
-
-This change delegates setting of $(CC) and $(LD) to
-external/common/rules.mk, which is widely used in the external tree, and
-ensures that:
-    1) $(CC) is used instead of $(CROSS_COMPILE)gcc.
-    2) CC is only set when not passed from the environment.
-
-Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
----
- external/common/rules.mk   | 6 ++++--
- external/gard/rules.mk     | 2 --
- external/opal-prd/Makefile | 2 --
- external/pflash/rules.mk   | 2 --
- external/shared/Makefile   | 1 -
- 5 files changed, 4 insertions(+), 9 deletions(-)
-
-diff --git a/external/common/rules.mk b/external/common/rules.mk
-index ec20593..95a2757 100644
---- a/external/common/rules.mk
-+++ b/external/common/rules.mk
-@@ -1,3 +1,5 @@
-+CC ?= $(CROSS_COMPILE)gcc
-+LD ?= $(CROSS_COMPILE)ld
- ARCH := $(shell $(GET_ARCH) "$(CROSS_COMPILE)")
- 
- ifeq ($(ARCH),ARCH_ARM)
-@@ -42,8 +44,8 @@ arch_clean:
- $(ARCH_SRC): | common
- 
- $(ARCH_OBJS): common-%.o: common/%.c
--	$(Q_CC)$(CROSS_COMPILE)gcc $(CFLAGS) $(CPPFLAGS) -c $< -o $@
-+	$(Q_CC)$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
- 
- common-arch_flash.o: $(ARCH_OBJS)
--	$(Q_LD)$(CROSS_COMPILE)ld -r $(ARCH_OBJS) -o $@
-+	$(Q_LD)$(LD) -r $(ARCH_OBJS) -o $@
- 
-diff --git a/external/gard/rules.mk b/external/gard/rules.mk
-index f0086a2..0dd14ed 100644
---- a/external/gard/rules.mk
-+++ b/external/gard/rules.mk
-@@ -7,8 +7,6 @@ OBJS     += $(LIBFLASH_OBJS)
- OBJS     += common-arch_flash.o
- EXE       = gard
- 
--CC = $(CROSS_COMPILE)gcc
--
- prefix = /usr/local/
- sbindir = $(prefix)/sbin
- datadir = $(prefix)/share
-diff --git a/external/opal-prd/Makefile b/external/opal-prd/Makefile
-index 3f34371..ff5ba6b 100644
---- a/external/opal-prd/Makefile
-+++ b/external/opal-prd/Makefile
-@@ -1,5 +1,3 @@
--CC = $(CROSS_COMPILE)gcc
--
- CFLAGS += -m64 -Werror -Wall -g2 -ggdb
- LDFLAGS += -m64
- ASFLAGS = -m64
-diff --git a/external/pflash/rules.mk b/external/pflash/rules.mk
-index 219e3d3..aa426b5 100644
---- a/external/pflash/rules.mk
-+++ b/external/pflash/rules.mk
-@@ -9,8 +9,6 @@ OBJS	+= $(LIBFLASH_OBJS)
- OBJS	+= common-arch_flash.o
- EXE     = pflash
- 
--CC	= $(CROSS_COMPILE)gcc
--
- PFLASH_VERSION ?= $(shell ../../make_version.sh $(EXE))
- 
- version.c: .version
-diff --git a/external/shared/Makefile b/external/shared/Makefile
-index ffc049f..4c31657 100644
---- a/external/shared/Makefile
-+++ b/external/shared/Makefile
-@@ -1,5 +1,4 @@
- .DEFAULT_GOAL := all
--CC ?= $(CROSS_COMPILE)gcc
- GET_ARCH = ../../external/common/get_arch.sh
- include ../../external/common/rules.mk
- 
--- 
-2.6.3
-