diff --git a/firmware/rolo.c b/firmware/rolo.c
index bfc0c13ff7..600f495bf4 100644
--- a/firmware/rolo.c
+++ b/firmware/rolo.c
@@ -340,6 +340,7 @@ int rolo_load(const char* filename)
     rolo_restart(audiobuf, ramstart, length);
 
     return 0; /* this is never reached */
+    (void)i; (void)checksum; (void)file_checksum;
 }
 #else  /* !defined(IRIVER_IFP7XX_SERIES) */
 int rolo_load(const char* filename)
diff --git a/firmware/sound.c b/firmware/sound.c
index 123675cbde..35c869c4af 100644
--- a/firmware/sound.c
+++ b/firmware/sound.c
@@ -412,6 +412,7 @@ void sound_set_volume(int value)
     int tmp = (60 - value * 4) & 0xff;
     CODECVOL = tmp | (tmp << 8);
 #endif
+    (void)value;
 }
 
 void sound_set_balance(int value)
@@ -429,8 +430,8 @@ void sound_set_balance(int value)
     set_prescaled_volume();
 #elif CONFIG_CPU == PNX0101
     /* TODO: implement for iFP */
-    (void)value;
 #endif
+    (void)value;
 }
 
 void sound_set_bass(int value)
@@ -459,8 +460,8 @@ void sound_set_bass(int value)
     set_prescaled_volume();
 #elif CONFIG_CPU == PNX0101
     /* TODO: implement for iFP */
-    (void)value;
 #endif               
+    (void)value;
 }
 
 void sound_set_treble(int value)
@@ -489,8 +490,8 @@ void sound_set_treble(int value)
     set_prescaled_volume();
 #elif CONFIG_CPU == PNX0101 
     /* TODO: implement for iFP */
+#endif
     (void)value;
-#endif    
 }
 
 void sound_set_channels(int value)
diff --git a/firmware/target/arm/imx31/gigabeat-s/i2c-imx31.c b/firmware/target/arm/imx31/gigabeat-s/i2c-imx31.c
index 7c608c172d..54ddaa7a46 100644
--- a/firmware/target/arm/imx31/gigabeat-s/i2c-imx31.c
+++ b/firmware/target/arm/imx31/gigabeat-s/i2c-imx31.c
@@ -19,6 +19,7 @@
 #include "system.h"
 #include "i2c-imx31.h"
 
+#if 0
 static int i2c_getack(void)
 {
     return 0;
@@ -38,11 +39,12 @@ static int i2c_outb(unsigned char byte)
     (void)byte;
     return 0;
 }
+#endif
 
 void i2c_write(int addr, const unsigned char *buf, int count)
 {
     (void)addr;
-    (void)*buf;
+    (void)buf;
     (void)count;
 }
 
diff --git a/firmware/target/arm/imx31/gigabeat-s/pcm-imx31.c b/firmware/target/arm/imx31/gigabeat-s/pcm-imx31.c
index 8485679aa4..4d2206bd56 100644
--- a/firmware/target/arm/imx31/gigabeat-s/pcm-imx31.c
+++ b/firmware/target/arm/imx31/gigabeat-s/pcm-imx31.c
@@ -25,7 +25,9 @@
 #include "file.h"
 #include "mmu-imx31.h"
 
+#if 0
 static int pcm_freq = HW_SAMPR_DEFAULT; /* 44.1 is default */
+#endif
 
 void pcm_play_lock(void)
 {
@@ -35,9 +37,11 @@ void pcm_play_unlock(void)
 {
 }
 
+#if 0
 static void _pcm_apply_settings(void)
 {
 }
+#endif
 
 void pcm_apply_settings(void)
 {
@@ -51,6 +55,7 @@ void pcm_postinit(void)
 {
 }
 
+#if 0
 /* Connect the DMA and start filling the FIFO */
 static void play_start_pcm(void)
 {
@@ -60,6 +65,7 @@ static void play_start_pcm(void)
 static void play_stop_pcm(void)
 {
 }
+#endif
 
 void pcm_play_dma_start(const void *addr, size_t size)
 {
@@ -73,6 +79,7 @@ void pcm_play_dma_stop(void)
 
 void pcm_play_dma_pause(bool pause)
 {
+    (void)pause;
 }
 
 /* Set the pcm frequency hardware will use when play is next started or
@@ -80,17 +87,20 @@ void pcm_play_dma_pause(bool pause)
    hardware here but simply cache it. */
 void pcm_set_frequency(unsigned int frequency)
 {
+    (void)frequency;
 }
 
 /* Return the number of bytes waiting - full L-R sample pairs only */
 size_t pcm_get_bytes_waiting(void)
 {
+    return 0;
 }
 
 /* Return a pointer to the samples and the number of them in *count */
 const void * pcm_play_dma_get_peak_buffer(int *count)
 {
     (void)count;
+    return NULL;
 }
 
 /* Any recording functionality should be implemented similarly */
diff --git a/firmware/timer.c b/firmware/timer.c
index c803048744..3d522efd41 100644
--- a/firmware/timer.c
+++ b/firmware/timer.c
@@ -212,6 +212,8 @@ static bool timer_set(long cycles, bool start)
     return true;
 #elif (CONFIG_CPU == IMX31L)
     /* TODO */
+    (void)cycles; (void)start;
+    return false;
 #else
     return __TIMER_SET(cycles, start);
 #endif /* CONFIG_CPU */
@@ -280,6 +282,7 @@ bool timer_register(int reg_prio, void (*unregister_callback)(void),
     return true;
 #elif CONFIG_CPU == IMX31L
     /* TODO */
+    return false;
 #else
     return __TIMER_REGISTER(reg_prio, unregister_callback, cycles,
                             int_prio, timer_callback);