diff --git a/src/driver/framebuffer.cpp b/src/driver/framebuffer.cpp
index b727ef51e..26694221a 100644
--- a/src/driver/framebuffer.cpp
+++ b/src/driver/framebuffer.cpp
@@ -632,7 +632,9 @@ void CFrameBuffer::paintBoxRel(const int x, const int y, const int dx, const int
     int corner_bl = (type & CORNER_BOTTOM_LEFT)  ? 1 : 0;
     int corner_br = (type & CORNER_BOTTOM_RIGHT) ? 1 : 0;
 
-#ifndef USE_NEVIS_GXA
+#ifdef USE_NEVIS_GXA
+    OpenThreads::ScopedLock<OpenThreads::Mutex> m_lock(mutex);
+#else
     int swidth = stride / sizeof(fb_pixel_t);
     fb_pixel_t *fbp = getFrameBufferPointer() + (swidth * y);
 #endif
@@ -763,6 +765,7 @@ void CFrameBuffer::paintVLine(int x, int ya, int yb, const fb_pixel_t col)
 		return;
 
 #ifdef USE_NEVIS_GXA
+    OpenThreads::ScopedLock<OpenThreads::Mutex> m_lock(mutex);
     /* draw a single vertical line from point x/ya to x/yb */
     unsigned int cmd = GXA_CMD_NOT_TEXT | GXA_SRC_BMP_SEL(2) | GXA_DST_BMP_SEL(2) | GXA_PARAM_COUNT(2) | GXA_CMD_NOT_ALPHA;
 
@@ -788,6 +791,7 @@ void CFrameBuffer::paintVLineRel(int x, int y, int dy, const fb_pixel_t col)
 		return;
 
 #ifdef USE_NEVIS_GXA
+	OpenThreads::ScopedLock<OpenThreads::Mutex> m_lock(mutex);
 	/* draw a single vertical line from point x/y with hight dx */
 	unsigned int cmd = GXA_CMD_NOT_TEXT | GXA_SRC_BMP_SEL(2) | GXA_DST_BMP_SEL(2) | GXA_PARAM_COUNT(2) | GXA_CMD_NOT_ALPHA;
 
@@ -811,6 +815,7 @@ void CFrameBuffer::paintHLine(int xa, int xb, int y, const fb_pixel_t col)
 		return;
 
 #ifdef USE_NEVIS_GXA
+	OpenThreads::ScopedLock<OpenThreads::Mutex> m_lock(mutex);
 	/* draw a single horizontal line from point xa/y to xb/y */
 	unsigned int cmd = GXA_CMD_NOT_TEXT | GXA_SRC_BMP_SEL(2) | GXA_DST_BMP_SEL(2) | GXA_PARAM_COUNT(2) | GXA_CMD_NOT_ALPHA;
 
@@ -835,6 +840,7 @@ void CFrameBuffer::paintHLineRel(int x, int dx, int y, const fb_pixel_t col)
 		return;
 
 #ifdef USE_NEVIS_GXA
+	OpenThreads::ScopedLock<OpenThreads::Mutex> m_lock(mutex);
 	/* draw a single horizontal line from point x/y with width dx */
 	unsigned int cmd = GXA_CMD_NOT_TEXT | GXA_SRC_BMP_SEL(2) | GXA_DST_BMP_SEL(2) | GXA_PARAM_COUNT(2) | GXA_CMD_NOT_ALPHA;
 
@@ -1698,6 +1704,7 @@ void CFrameBuffer::blit2FB(void *fbbuff, uint32_t width, uint32_t height, uint32
 	//printf("CFrameBuffer::blit2FB: data %x Kva %x\n", (int) fbbuff, (int) uKva);
 
 	if(uKva != NULL) {
+		OpenThreads::ScopedLock<OpenThreads::Mutex> m_lock(mutex);
 		cmd = GXA_CMD_BLT | GXA_CMD_NOT_TEXT | GXA_SRC_BMP_SEL(1) | GXA_DST_BMP_SEL(2) | GXA_PARAM_COUNT(3);
 
 		_write_gxa(gxa_base, GXA_BMP1_TYPE_REG, (3 << 16) | width);
diff --git a/src/driver/framebuffer.h b/src/driver/framebuffer.h
index e971dabc1..9028b9d53 100644
--- a/src/driver/framebuffer.h
+++ b/src/driver/framebuffer.h
@@ -32,6 +32,8 @@
 
 #include <string>
 #include <map>
+#include <OpenThreads/Mutex>
+#include <OpenThreads/ScopedLock>
 
 #define fb_pixel_t uint32_t
 
@@ -57,6 +59,7 @@ class CFrameBuffer
 	private:
 
 		CFrameBuffer();
+		OpenThreads::Mutex mutex;
 
 		struct rgbData
 		{