lwip is back (using printf with malloc, but apart from that static)

bsp_z7/ps7_cortexa9_0/libsrc/standalone/CMakeLists.txt

@@ -6,7 +6,7 @@ target_sources(${TARGET_NAME} PUBLIC
     src/asm_vectors.S
     src/open.c
     src/xil_exception.c
-    #src/sbrk.c
+    src/sbrk.c
     src/xl2cc_counter.c
     src/xil_cache.c
     src/xil_spinlock.c
@@ -48,5 +48,5 @@ target_sources(${TARGET_NAME} PUBLIC
     src/outbyte.c
     src/unlink.c
     src/abort.c
-    #src/_sbrk.c
+    src/_sbrk.c
 )

bsp_z7/ps7_cortexa9_0/libsrc/standalone/src/outbyte.c

@@ -15,5 +15,5 @@ void outbyte(char c);
 #endif 
 
 void outbyte(char c) {
-	 XUartPs_SendByte(STDOUT_BASEADDRESS, c);
+	 //XUartPs_SendByte(STDOUT_BASEADDRESS, c);
 }