diff --git a/board/nm/nmhw21/board.c b/board/nm/nmhw21/board.c
index f90b03f8ea..db4009ae68 100644
--- a/board/nm/nmhw21/board.c
+++ b/board/nm/nmhw21/board.c
@@ -703,42 +703,48 @@ static void init_gsm(void)
 
 	/*
 	 * Perform power up sequence for TOBY-L2 modem.
-	 *
-	 * Modem is initially disabled and does not start automatically.
-	 * Enable power and start modem by "pressing" POWER_ON_OFF input for 1.0s.
-	 *
+	 * 
+	 * TOBY-L2 series can be switched on in one of the following ways:
+	 * - Rising edge on the VCC pin to a valid voltage for module supply, 
+	 *   i.e. applying module supply
+	 * - Low level on the PWR_ON pin, which is normally set high by an 
+	 *   internal pull-up, for a valid time period when the applied VCC 
+	 *   voltage is within the valid operating range (see section 4.2.8). 
+	 * - Low level on the RESET_N pin, which is normally set high by an 
+	 *   internal pull-up, for a valid time period when the applied VCC
+	 *   voltage is within the valid operating range (see section 4.2.9). 
+	 * 
+	 * PWR_ON low time: 5 ms - Low time to switch-on the module
+	 * RESET_N low time: 18..800 ms - Low time to switch-on the module
+	 *                   2.1..15 s - Low time to reset the module
+	 *                   16 s - Low time to switch-off the module
+	 * 
 	 * References:
 	 *  - uBlox TOBY-L2 Datasheet UBX-13004573 - R24
 	 *    2.3.1 Module power-on
+	 *    4.2.8 PWR_ON pin
+	 *    4.2.9 RESET_N pin
+	 * 
+	 * Functionality:
+	 *  - Leave GSM power enable as is (default at power up = off)
+	 *  - Set reset line inactive (note: inverter logic in HW present)
+	 *  - Leave button unpressed (note: inverter logic in HW present)
+	 *  - Modem shall be enabled by Linux system by enabling GSM power 
+	 *    supply
 	 */
 
-	bus = da9063_claim_i2c_bus();
-
 	puts("GSM:   ");
 
-	/* TODO: Keep Power-On and use GSM Modem Reset Signal to restart */
+	REQUEST_AND_CLEAR_GPIO(GPIO_RST_GSM);		/* Set reset inactive (active high) */
+	REQUEST_AND_CLEAR_GPIO(GPIO_PWR_GSM);		/* Set power switch inactive/released (active high) */
 
-	REQUEST_AND_SET_GPIO(GPIO_RST_GSM);		/* Assert reset (active high) */
-	REQUEST_AND_CLEAR_GPIO(GPIO_PWR_GSM);		/* Keep power switch inactive (released) */
-
-	da9063_set_gpio(PMIC_GSM_SUPPLY_EN_IO, 0);	/* Switch GSM Supply off */
-	mdelay(30+100);					/* Give time to discharge supply */
-							/* Keep of for 100ms, #3.3.2 */
-
-	da9063_set_gpio(PMIC_GSM_SUPPLY_EN_IO, 1);	/* Enable GSM supply */
-	mdelay(10);
-
-	gpio_set_value(GPIO_RST_GSM, 0);		/* Take modem out of reset */
-
-	puts("ready\n");
-
-	da9063_release_i2c_bus(bus);
+	puts("init\n");
 }
 
 static void init_gnss(void)
 {
 	/*
-	 * Release GNSS reset line, so that modem starts up early
+	 * Release GNSS reset line, so that module starts up early
 	 */
 	REQUEST_AND_SET_GPIO(GPIO_RST_GNSS);
 }
@@ -1349,7 +1355,7 @@ int ft_board_setup(void *blob, bd_t *bd)
 {
 	ft_bootloader_version(blob);
 	ft_hw_info(blob);
-        ft_user_interface(blob);
+	ft_user_interface(blob);
 	ft_user_module(blob);
 	ft_eth(blob);