diff --git a/frameworks/verilator/SPIScreen.cpp b/frameworks/verilator/SPIScreen.cpp
index a6e6e5e5..e6ff37f6 100644
--- a/frameworks/verilator/SPIScreen.cpp
+++ b/frameworks/verilator/SPIScreen.cpp
@@ -204,7 +204,7 @@ void SPIScreen::cmd_write_ram()
     // 6-6-6
     m_rgb[(m_step - 1)] = m_byte;
     if (m_step == 3) {
-      // fprintf(stdout,"666 x %d, y %d\n",m_x_cur,m_y_cur);
+      //fprintf(stdout,"666 x %d, y %d\n",m_x_cur,m_y_cur);
       m_framebuffer.pixel<LibSL::Memory::Array::Wrap>(
                                   m_y_cur,m_x_cur) = m_rgb;
     }
@@ -235,8 +235,8 @@ void SPIScreen::cmd_write_ram()
         // bgr
         std::swap(m_rgb[0],m_rgb[2]);
       }
-      //fprintf(stdout,"565 x %d, y %d rgb:%x,%x,%x\n",
-      //        m_x_cur,m_y_cur,(int)m_rgb[0],(int)m_rgb[1],(int)m_rgb[2]);
+      fprintf(stdout,"565 x %d, y %d rgb:%x,%x,%x\n",
+              m_x_cur,m_y_cur,(int)m_rgb[0],(int)m_rgb[1],(int)m_rgb[2]);
       m_rgb[0] <<= 3;      m_rgb[1] <<= 2;      m_rgb[2] <<= 3;
       m_framebuffer.pixel<LibSL::Memory::Array::Wrap>(
                                   m_y_cur,m_x_cur) = m_rgb;
diff --git a/frameworks/verilator/display.cpp b/frameworks/verilator/display.cpp
index 6dddebf4..83d28606 100644
--- a/frameworks/verilator/display.cpp
+++ b/frameworks/verilator/display.cpp
@@ -106,10 +106,10 @@ void render()
   // lock the mutex before accessing g_Chip
   std::lock_guard<std::mutex> lock(g_Mutex);
   // has the framebuffer changed?
-  if (g_Chip->framebufferChanged()) {
-    // yes: refresh frame
-    refresh();
-  }
+  //if (g_Chip->framebufferChanged()) {
+  // yes: refresh frame
+  refresh();
+  //}
 }
 
 // ----------------------------------------------------------------------------
diff --git a/learn-silice/classroom/soc_wave_player/firmware/Makefile b/learn-silice/classroom/soc_wave_player/firmware/Makefile
index e94ee78c..ab97f98f 100644
--- a/learn-silice/classroom/soc_wave_player/firmware/Makefile
+++ b/learn-silice/classroom/soc_wave_player/firmware/Makefile
@@ -7,12 +7,12 @@ LD   = $(ARCH)-ld
 OBJS = sdcard.o div.o std.o config.o oled.o display.o printf.o mul.o crt0.o fat_io_lib.o
 
 $(PRGS): %: %.o $(OBJS)
-		$(LD) -m elf32lriscv -b elf32-littleriscv --gc-sections -Tconfig_c.ld --no-relax -o code.elf $^
+		$(LD) -m elf32lriscv -b elf32-littleriscv -Tconfig_c.ld --no-relax -o code.elf $^
 		$(ARCH)-objcopy -O verilog code.elf code.hex
 		$(ARCH)-objdump --disassemble code.elf > code.s
 
 %.o : %.c
-		$(CC) -ffunction-sections -fdata-sections -fno-builtin -fno-unroll-loops -O2 -fno-stack-protector -fno-pic -march=rv32i -mabi=ilp32 -c $< -o $@
+		$(CC) -fno-builtin -fno-unroll-loops -O2 -fno-stack-protector -fno-pic -march=rv32i -mabi=ilp32 -c $< -o $@
 
 %.o : %.s
 		$(AS) -march=rv32i -mabi=ilp32 $< -o $@