diff --git a/mik32_debug_hal/power_manager.py b/mik32_debug_hal/power_manager.py
index 8c013b4..1a31c3f 100644
--- a/mik32_debug_hal/power_manager.py
+++ b/mik32_debug_hal/power_manager.py
@@ -3,31 +3,77 @@ import mik32_debug_hal.registers.memory_map as mem_map
 import mik32_debug_hal.registers.bitfields.power_manager as pm_fields
 import mik32_debug_hal.registers.bitfields.wakeup as wake_fields
 
+def pm_init(openocd: OpenOcdTclRpc) -> int:
 
-def pm_init(openocd: OpenOcdTclRpc):
+    iter_count = 0
+    max_iter_count = 2
 
-    WU_CLOCKS_default = 128 << wake_fields.CLOCKS_BU_ADJ_RC32K_S
+    while True:
+        print('Clock init... ', end='')
 
-    AHB_default = (
-        pm_fields.CLOCK_AHB_CPU_M |
-        pm_fields.CLOCK_AHB_EEPROM_M |
-        pm_fields.CLOCK_AHB_RAM_M |
-        pm_fields.CLOCK_AHB_SPIFI_M |
-        pm_fields.CLOCK_AHB_TCB_M |
-        pm_fields.CLOCK_AHB_DMA_M
-    )
-    # 0x1F
-    APB_M_default = (
-        pm_fields.CLOCK_APB_M_PM_M |
-        pm_fields.CLOCK_APB_M_PAD_CONFIG_M |
-        pm_fields.CLOCK_APB_M_WU_M
-    )
-    # 0x89
-    APB_P_default = pm_fields.CLOCK_APB_P_GPIO_2_M
-    # 0x00
+        WU_CLOCKS_default = 128 << wake_fields.CLOCKS_BU_ADJ_RC32K_S
 
-    openocd.halt()
-    openocd.write_word(mem_map.WU_CLOCKS_BU_OFFSET, WU_CLOCKS_default)
-    openocd.write_word(mem_map.PM_Clk_APB_P_Set_OFFSET, APB_P_default)
-    openocd.write_word(mem_map.PM_Clk_APB_M_Set_OFFSET, APB_M_default)
-    openocd.write_word(mem_map.PM_Clk_AHB_Set_OFFSET, AHB_default)
+        AHB_default = (
+            pm_fields.CLOCK_AHB_CPU_M |
+            pm_fields.CLOCK_AHB_EEPROM_M |
+            pm_fields.CLOCK_AHB_RAM_M |
+            pm_fields.CLOCK_AHB_SPIFI_M |
+            pm_fields.CLOCK_AHB_TCB_M |
+            pm_fields.CLOCK_AHB_DMA_M
+        )
+        # 0x1F
+        APB_M_default = (
+            pm_fields.CLOCK_APB_M_PM_M |
+            pm_fields.CLOCK_APB_M_PAD_CONFIG_M |
+            pm_fields.CLOCK_APB_M_WU_M
+        )
+        # 0x89
+        # APB_P_default = pm_fields.CLOCK_APB_P_GPIO_2_M
+        APB_P_default = 0
+        # 0x00
+
+        # openocd.halt()
+        # openocd.write_word(mem_map.WU_CLOCKS_BU_OFFSET, WU_CLOCKS_default)
+        # openocd.write_word(mem_map.PM_Clk_APB_P_Set_OFFSET, APB_P_default)
+        # openocd.write_word(mem_map.PM_Clk_APB_M_Set_OFFSET, APB_M_default)
+        # openocd.write_word(mem_map.PM_Clk_AHB_Set_OFFSET, AHB_default)
+
+        openocd.halt()
+        openocd.write_word(mem_map.PM_Clk_APB_P_Clear_OFFSET, ~APB_P_default)
+        openocd.write_word(mem_map.PM_Clk_APB_P_Set_OFFSET, APB_P_default)
+        # openocd.halt()
+        openocd.write_word(mem_map.PM_Clk_AHB_Clear_OFFSET, ~AHB_default)
+        openocd.write_word(mem_map.PM_Clk_AHB_Set_OFFSET, AHB_default)
+        # openocd.halt()
+        openocd.write_word(mem_map.PM_Clk_APB_M_Clear_OFFSET, ~APB_M_default)
+        openocd.write_word(mem_map.PM_Clk_APB_M_Set_OFFSET, APB_M_default)
+        # openocd.halt()
+        openocd.write_word(mem_map.WU_CLOCKS_BU_OFFSET, WU_CLOCKS_default)
+        # openocd.halt()
+
+
+        AHB_real = openocd.read_word(mem_map.PM_Clk_AHB_Set_OFFSET)
+        APB_M_real = openocd.read_word(mem_map.PM_Clk_APB_M_Set_OFFSET)
+        APB_P_real = openocd.read_word(mem_map.PM_Clk_APB_P_Set_OFFSET)
+        WU_CLOCKS_real = openocd.read_word(mem_map.WU_CLOCKS_BU_OFFSET)
+
+        if (
+            (WU_CLOCKS_real == WU_CLOCKS_default) and
+            (AHB_real == AHB_default) and
+            (APB_M_real == APB_M_default) and
+            (APB_P_real == APB_P_default)
+        ):
+            print('OK!')
+            return 0
+        else:
+            print('\nPM initialization results:')
+            print(f'wu    план 0x{WU_CLOCKS_default:08x} факт 0x{WU_CLOCKS_real:08x}')
+            print(f'ahb   план 0x{AHB_default:08x} факт 0x{AHB_real:08x}')
+            print(f'apb_m план 0x{APB_M_default:08x} факт 0x{APB_M_real:08x}')
+            print(f'apb_p план 0x{APB_P_default:08x} факт 0x{APB_P_real:08x}')
+            iter_count += 1
+            if iter_count < max_iter_count:
+                print(f'ERROR: PM initialization failed, retry #{iter_count}...', flush=True)
+            else:
+                print('ERROR: PM initialization failed, aborting', flush=True)
+                return 1
diff --git a/mik32_upload.py b/mik32_upload.py
index 5b347b8..b02a2fb 100644
--- a/mik32_upload.py
+++ b/mik32_upload.py
@@ -253,7 +253,9 @@ def upload_file(
 
             logging.debug("OpenOCD configured!")
 
-            power_manager.pm_init(openocd)
+            result = power_manager.pm_init(openocd)
+            if result != 0:
+                return 1
 
             logging.debug("PM configured!")