diff --git a/bootloader/main.c b/bootloader/main.c
index 12566ce..095f4bc 100644
--- a/bootloader/main.c
+++ b/bootloader/main.c
@@ -1302,7 +1302,8 @@ void ipl_main()
 
 	while (true)
 		tui_do_menu(&menu_top);
-
+	
+	// Halt BPMP if we managed to get out of execution.
 	while (true)
-		;
+		bpmp_halt();
 }
diff --git a/bootloader/soc/bpmp.c b/bootloader/soc/bpmp.c
index 1794696..cc20d89 100644
--- a/bootloader/soc/bpmp.c
+++ b/bootloader/soc/bpmp.c
@@ -216,3 +216,37 @@ void bpmp_clk_rate_set(bpmp_freq_t fid)
 	}
 }
 
+// The following functions halt BPMP to reduce power while sleeping.
+// They are not as accurate as RTC at big values but they guarantee time+ delay.
+void bpmp_usleep(u32 us)
+{
+	u32 delay;
+
+	// Each iteration takes 1us.
+	while (us)
+	{
+		delay = (us > HALT_COP_MAX_CNT) ? HALT_COP_MAX_CNT : us;
+		us -= delay;
+
+		FLOW_CTLR(FLOW_CTLR_HALT_COP_EVENTS) = HALT_COP_WAIT_EVENT | HALT_COP_USEC | delay;
+	}
+}
+
+void bpmp_msleep(u32 ms)
+{
+	u32 delay;
+
+	// Iteration time is variable. ~200 - 1000us.
+	while (ms)
+	{
+		delay = (ms > HALT_COP_MAX_CNT) ? HALT_COP_MAX_CNT : ms;
+		ms -= delay;
+
+		FLOW_CTLR(FLOW_CTLR_HALT_COP_EVENTS) = HALT_COP_WAIT_EVENT | HALT_COP_MSEC | delay;
+	}
+}
+
+void bpmp_halt()
+{
+	FLOW_CTLR(FLOW_CTLR_HALT_COP_EVENTS) = HALT_COP_WAIT_EVENT | HALT_COP_JTAG;
+}
diff --git a/bootloader/soc/bpmp.h b/bootloader/soc/bpmp.h
index 5c8f14b..b45ab7a 100644
--- a/bootloader/soc/bpmp.h
+++ b/bootloader/soc/bpmp.h
@@ -47,5 +47,8 @@ void bpmp_mmu_set_entry(int idx, bpmp_mmu_entry_t *entry, bool apply);
 void bpmp_mmu_enable();
 void bpmp_mmu_disable();
 void bpmp_clk_rate_set(bpmp_freq_t fid);
+void bpmp_usleep(u32 us);
+void bpmp_msleep(u32 ms);
+void bpmp_halt();
 
 #endif
diff --git a/bootloader/soc/cluster.h b/bootloader/soc/cluster.h
index 5cecd19..428c046 100644
--- a/bootloader/soc/cluster.h
+++ b/bootloader/soc/cluster.h
@@ -19,19 +19,6 @@
 
 #include "../utils/types.h"
 
-/*! Flow controller registers. */
-#define FLOW_CTLR_HALT_CPU0_EVENTS 0x0
-#define FLOW_CTLR_HALT_CPU1_EVENTS 0x14
-#define FLOW_CTLR_HALT_CPU2_EVENTS 0x1C
-#define FLOW_CTLR_HALT_CPU3_EVENTS 0x24
-#define FLOW_CTLR_HALT_COP_EVENTS 0x4
-#define FLOW_CTLR_CPU0_CSR 0x8
-#define FLOW_CTLR_CPU1_CSR 0x18
-#define FLOW_CTLR_CPU2_CSR 0x20
-#define FLOW_CTLR_CPU3_CSR 0x28
-#define FLOW_CTLR_RAM_REPAIR 0x40
-#define FLOW_CTLR_BPMP_CLUSTER_CONTROL 0x98
-
 void cluster_boot_cpu0(u32 entry);
 
 #endif
diff --git a/bootloader/soc/t210.h b/bootloader/soc/t210.h
index 1a9ef3f..d5a526b 100644
--- a/bootloader/soc/t210.h
+++ b/bootloader/soc/t210.h
@@ -189,4 +189,24 @@
 #define  EMC_HEKA_UPD (1 << 30)
 #define  EMC_SEPT_RUN (1 << 31)
 
+/*! Flow controller registers. */
+#define FLOW_CTLR_HALT_COP_EVENTS  0x4
+#define  HALT_COP_SEC        (1 << 23)
+#define  HALT_COP_MSEC       (1 << 24)
+#define  HALT_COP_USEC       (1 << 25)
+#define  HALT_COP_JTAG       (1 << 28)
+#define  HALT_COP_WAIT_EVENT (1 << 30)
+#define  HALT_COP_WAIT_IRQ   (1 << 31)
+#define  HALT_COP_MAX_CNT        0xFF
+#define FLOW_CTLR_HALT_CPU0_EVENTS 0x0
+#define FLOW_CTLR_HALT_CPU1_EVENTS 0x14
+#define FLOW_CTLR_HALT_CPU2_EVENTS 0x1C
+#define FLOW_CTLR_HALT_CPU3_EVENTS 0x24
+#define FLOW_CTLR_CPU0_CSR 0x8
+#define FLOW_CTLR_CPU1_CSR 0x18
+#define FLOW_CTLR_CPU2_CSR 0x20
+#define FLOW_CTLR_CPU3_CSR 0x28
+#define FLOW_CTLR_RAM_REPAIR 0x40
+#define FLOW_CTLR_BPMP_CLUSTER_CONTROL 0x98
+
 #endif
diff --git a/bootloader/utils/util.c b/bootloader/utils/util.c
index 4bdc1ff..8833feb 100644
--- a/bootloader/utils/util.c
+++ b/bootloader/utils/util.c
@@ -24,6 +24,8 @@
 #include "../soc/pmc.h"
 #include "../soc/t210.h"
 
+#define USE_RTC_TIMER
+
 extern void sd_unmount();
 
 u32 get_tmr_s()
@@ -35,7 +37,7 @@ u32 get_tmr_ms()
 {
 	// The registers must be read with the following order:
 	// RTC_MILLI_SECONDS (0x10) -> RTC_SHADOW_SECONDS (0xC)
-	return (RTC(APBDEV_RTC_MILLI_SECONDS) | (RTC(APBDEV_RTC_SHADOW_SECONDS) << 10));
+	return (RTC(APBDEV_RTC_MILLI_SECONDS) + (RTC(APBDEV_RTC_SHADOW_SECONDS) * 1000));
 }
 
 u32 get_tmr_us()
@@ -43,19 +45,28 @@ u32 get_tmr_us()
 	return TMR(TIMERUS_CNTR_1US); //TIMERUS_CNTR_1US
 }
 
-void msleep(u32 milliseconds)
+void msleep(u32 ms)
 {
-	u32 start = RTC(APBDEV_RTC_MILLI_SECONDS) | (RTC(APBDEV_RTC_SHADOW_SECONDS) << 10);
-	while (((RTC(APBDEV_RTC_MILLI_SECONDS) | (RTC(APBDEV_RTC_SHADOW_SECONDS) << 10)) - start) <= milliseconds)
+#ifdef USE_RTC_TIMER
+	u32 start = RTC(APBDEV_RTC_MILLI_SECONDS) + (RTC(APBDEV_RTC_SHADOW_SECONDS) * 1000);
+	// Casting to u32 is important!
+	while (((u32)(RTC(APBDEV_RTC_MILLI_SECONDS) + (RTC(APBDEV_RTC_SHADOW_SECONDS) * 1000)) - start) <= ms)
 		;
+#else
+	bpmp_msleep(ms);
+#endif
 }
 
-void usleep(u32 microseconds)
+void usleep(u32 us)
 {
+#ifdef USE_RTC_TIMER
 	u32 start = TMR(TIMERUS_CNTR_1US);
 	// Casting to u32 is important!
-	while ((u32)(TMR(TIMERUS_CNTR_1US) - start) <= microseconds)
+	while ((u32)(TMR(TIMERUS_CNTR_1US) - start) <= us)
 		;
+#else
+	bpmp_usleep(us);
+#endif
 }
 
 void exec_cfg(u32 *base, const cfg_op_t *ops, u32 num_ops)
@@ -76,7 +87,6 @@ void panic(u32 val)
 	
 	while (true)
 		usleep(1);
-
 }
 
 void reboot_normal()
@@ -100,7 +110,7 @@ void reboot_rcm()
 	PMC(APBDEV_PMC_CNTRL) |= PMC_CNTRL_MAIN_RST;
 
 	while (true)
-		usleep(1);
+		bpmp_halt();
 }
 
 void power_off()
@@ -114,5 +124,5 @@ void power_off()
 	i2c_send_byte(I2C_5, MAX77620_I2C_ADDR, MAX77620_REG_ONOFFCNFG1, MAX77620_ONOFFCNFG1_PWR_OFF);
 	
 	while (true)
-		usleep(1);
+		bpmp_halt();
 }
diff --git a/bootloader/utils/util.h b/bootloader/utils/util.h
index ae736dd..3a81e55 100644
--- a/bootloader/utils/util.h
+++ b/bootloader/utils/util.h
@@ -46,8 +46,8 @@ typedef struct _nyx_storage_t
 u32 get_tmr_us();
 u32 get_tmr_ms();
 u32 get_tmr_s();
-void usleep(u32 ticks);
-void msleep(u32 milliseconds);
+void usleep(u32 us);
+void msleep(u32 ms);
 void panic(u32 val);
 void reboot_normal();
 void reboot_rcm();
diff --git a/nyx/nyx_gui/nyx.c b/nyx/nyx_gui/nyx.c
index 941bac0..1144f5d 100644
--- a/nyx/nyx_gui/nyx.c
+++ b/nyx/nyx_gui/nyx.c
@@ -358,6 +358,7 @@ void load_saved_configuration()
 void nyx_init_load_res()
 {
 	bpmp_mmu_enable();
+	bpmp_clk_rate_set(BPMP_CLK_SUPER_BOOST);
 
 	// Set bootloader's default configuration.
 	set_default_configuration();
@@ -385,8 +386,6 @@ void nyx_init_load_res()
 	sd_unmount(false);
 
 	h_cfg.rcm_patched = fuse_check_patched_rcm();
-
-	bpmp_clk_rate_set(BPMP_CLK_SUPER_BOOST);
 }
 
 #define IPL_STACK_TOP  0x90010000
@@ -424,6 +423,7 @@ void ipl_main()
 
 	nyx_load_and_run();
 
+	// Halt BPMP if we managed to get out of execution.
 	while (true)
-		;
+		bpmp_halt();
 }
diff --git a/nyx/nyx_gui/soc/bpmp.c b/nyx/nyx_gui/soc/bpmp.c
index b5a8f07..45a4a0c 100644
--- a/nyx/nyx_gui/soc/bpmp.c
+++ b/nyx/nyx_gui/soc/bpmp.c
@@ -219,4 +219,39 @@ void bpmp_clk_rate_set(bpmp_freq_t fid)
 	}
 }
 
+// The following functions halt BPMP to reduce power while sleeping.
+// They are not as accurate as RTC at big values but they guarantee time+ delay.
+void bpmp_usleep(u32 us)
+{
+	u32 delay;
+
+	// Each iteration takes 1us.
+	while (us)
+	{
+		delay = (us > HALT_COP_MAX_CNT) ? HALT_COP_MAX_CNT : us;
+		us -= delay;
+
+		FLOW_CTLR(FLOW_CTLR_HALT_COP_EVENTS) = HALT_COP_WAIT_EVENT | HALT_COP_USEC | delay;
+	}
+}
+
+void bpmp_msleep(u32 ms)
+{
+	u32 delay;
+
+	// Iteration time is variable. ~200 - 1000us.
+	while (ms)
+	{
+		delay = (ms > HALT_COP_MAX_CNT) ? HALT_COP_MAX_CNT : ms;
+		ms -= delay;
+
+		FLOW_CTLR(FLOW_CTLR_HALT_COP_EVENTS) = HALT_COP_WAIT_EVENT | HALT_COP_MSEC | delay;
+	}
+}
+
+void bpmp_halt()
+{
+	FLOW_CTLR(FLOW_CTLR_HALT_COP_EVENTS) = HALT_COP_WAIT_EVENT | HALT_COP_JTAG;
+}
+
 #pragma GCC pop_options
diff --git a/nyx/nyx_gui/soc/bpmp.h b/nyx/nyx_gui/soc/bpmp.h
index 5c8f14b..b45ab7a 100644
--- a/nyx/nyx_gui/soc/bpmp.h
+++ b/nyx/nyx_gui/soc/bpmp.h
@@ -47,5 +47,8 @@ void bpmp_mmu_set_entry(int idx, bpmp_mmu_entry_t *entry, bool apply);
 void bpmp_mmu_enable();
 void bpmp_mmu_disable();
 void bpmp_clk_rate_set(bpmp_freq_t fid);
+void bpmp_usleep(u32 us);
+void bpmp_msleep(u32 ms);
+void bpmp_halt();
 
 #endif
diff --git a/nyx/nyx_gui/soc/cluster.h b/nyx/nyx_gui/soc/cluster.h
index 5cecd19..428c046 100644
--- a/nyx/nyx_gui/soc/cluster.h
+++ b/nyx/nyx_gui/soc/cluster.h
@@ -19,19 +19,6 @@
 
 #include "../utils/types.h"
 
-/*! Flow controller registers. */
-#define FLOW_CTLR_HALT_CPU0_EVENTS 0x0
-#define FLOW_CTLR_HALT_CPU1_EVENTS 0x14
-#define FLOW_CTLR_HALT_CPU2_EVENTS 0x1C
-#define FLOW_CTLR_HALT_CPU3_EVENTS 0x24
-#define FLOW_CTLR_HALT_COP_EVENTS 0x4
-#define FLOW_CTLR_CPU0_CSR 0x8
-#define FLOW_CTLR_CPU1_CSR 0x18
-#define FLOW_CTLR_CPU2_CSR 0x20
-#define FLOW_CTLR_CPU3_CSR 0x28
-#define FLOW_CTLR_RAM_REPAIR 0x40
-#define FLOW_CTLR_BPMP_CLUSTER_CONTROL 0x98
-
 void cluster_boot_cpu0(u32 entry);
 
 #endif
diff --git a/nyx/nyx_gui/soc/t210.h b/nyx/nyx_gui/soc/t210.h
index 1b11d72..5aa266f 100644
--- a/nyx/nyx_gui/soc/t210.h
+++ b/nyx/nyx_gui/soc/t210.h
@@ -188,4 +188,24 @@
 #define  EMC_HEKA_UPD (1 << 30)
 #define  EMC_SEPT_RUN (1 << 31)
 
+/*! Flow controller registers. */
+#define FLOW_CTLR_HALT_COP_EVENTS  0x4
+#define  HALT_COP_SEC        (1 << 23)
+#define  HALT_COP_MSEC       (1 << 24)
+#define  HALT_COP_USEC       (1 << 25)
+#define  HALT_COP_JTAG       (1 << 28)
+#define  HALT_COP_WAIT_EVENT (1 << 30)
+#define  HALT_COP_WAIT_IRQ   (1 << 31)
+#define  HALT_COP_MAX_CNT        0xFF
+#define FLOW_CTLR_HALT_CPU0_EVENTS 0x0
+#define FLOW_CTLR_HALT_CPU1_EVENTS 0x14
+#define FLOW_CTLR_HALT_CPU2_EVENTS 0x1C
+#define FLOW_CTLR_HALT_CPU3_EVENTS 0x24
+#define FLOW_CTLR_CPU0_CSR 0x8
+#define FLOW_CTLR_CPU1_CSR 0x18
+#define FLOW_CTLR_CPU2_CSR 0x20
+#define FLOW_CTLR_CPU3_CSR 0x28
+#define FLOW_CTLR_RAM_REPAIR 0x40
+#define FLOW_CTLR_BPMP_CLUSTER_CONTROL 0x98
+
 #endif
diff --git a/nyx/nyx_gui/utils/util.c b/nyx/nyx_gui/utils/util.c
index 6ec67a3..b1c5161 100644
--- a/nyx/nyx_gui/utils/util.c
+++ b/nyx/nyx_gui/utils/util.c
@@ -23,6 +23,8 @@
 #include "../soc/pmc.h"
 #include "../soc/t210.h"
 
+#define USE_RTC_TIMER
+
 extern void sd_unmount(bool deinit);
 
 u32 get_tmr_s()
@@ -34,7 +36,7 @@ u32 get_tmr_ms()
 {
 	// The registers must be read with the following order:
 	// RTC_MILLI_SECONDS (0x10) -> RTC_SHADOW_SECONDS (0xC)
-	return (RTC(APBDEV_RTC_MILLI_SECONDS) | (RTC(APBDEV_RTC_SHADOW_SECONDS) << 10));
+	return (RTC(APBDEV_RTC_MILLI_SECONDS) + (RTC(APBDEV_RTC_SHADOW_SECONDS) * 1000));
 }
 
 u32 get_tmr_us()
@@ -42,19 +44,28 @@ u32 get_tmr_us()
 	return TMR(TIMERUS_CNTR_1US); //TIMERUS_CNTR_1US
 }
 
-void msleep(u32 milliseconds)
+void msleep(u32 ms)
 {
-	u32 start = RTC(APBDEV_RTC_MILLI_SECONDS) | (RTC(APBDEV_RTC_SHADOW_SECONDS) << 10);
-	while (((RTC(APBDEV_RTC_MILLI_SECONDS) | (RTC(APBDEV_RTC_SHADOW_SECONDS) << 10)) - start) <= milliseconds)
+#ifdef USE_RTC_TIMER
+	u32 start = RTC(APBDEV_RTC_MILLI_SECONDS) + (RTC(APBDEV_RTC_SHADOW_SECONDS) * 1000);
+	// Casting to u32 is important!
+	while (((u32)(RTC(APBDEV_RTC_MILLI_SECONDS) + (RTC(APBDEV_RTC_SHADOW_SECONDS) * 1000)) - start) <= ms)
 		;
+#else
+	bpmp_msleep(ms);
+#endif
 }
 
-void usleep(u32 microseconds)
+void usleep(u32 us)
 {
+#ifdef USE_RTC_TIMER
 	u32 start = TMR(TIMERUS_CNTR_1US);
 	// Casting to u32 is important!
-	while ((u32)(TMR(TIMERUS_CNTR_1US) - start) <= microseconds)
+	while ((u32)(TMR(TIMERUS_CNTR_1US) - start) <= us)
 		;
+#else
+	bpmp_usleep(us);
+#endif
 }
 
 void exec_cfg(u32 *base, const cfg_op_t *ops, u32 num_ops)
@@ -75,7 +86,6 @@ void panic(u32 val)
 	
 	while (true)
 		usleep(1);
-
 }
 
 void reboot_normal()
@@ -99,7 +109,7 @@ void reboot_rcm()
 	PMC(APBDEV_PMC_CNTRL) |= PMC_CNTRL_MAIN_RST;
 
 	while (true)
-		usleep(1);
+		bpmp_halt();
 }
 
 void power_off()
@@ -110,5 +120,5 @@ void power_off()
 	i2c_send_byte(I2C_5, MAX77620_I2C_ADDR, MAX77620_REG_ONOFFCNFG1, MAX77620_ONOFFCNFG1_PWR_OFF);
 	
 	while (true)
-		usleep(1);
+		bpmp_halt();
 }
diff --git a/nyx/nyx_gui/utils/util.h b/nyx/nyx_gui/utils/util.h
index ae736dd..3a81e55 100644
--- a/nyx/nyx_gui/utils/util.h
+++ b/nyx/nyx_gui/utils/util.h
@@ -46,8 +46,8 @@ typedef struct _nyx_storage_t
 u32 get_tmr_us();
 u32 get_tmr_ms();
 u32 get_tmr_s();
-void usleep(u32 ticks);
-void msleep(u32 milliseconds);
+void usleep(u32 us);
+void msleep(u32 ms);
 void panic(u32 val);
 void reboot_normal();
 void reboot_rcm();