<p><b>@fjmolinas</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11359#discussion_r274879033">cpu/stm32_common/cpu_init.c</a>:</p>
<pre style='color:#555'>> @@ -49,6 +50,44 @@ void cpu_init(void)
     periph_clk_en(APB1, BIT_APB_PWREN);
     /* initialize the system clock as configured in the periph_conf.h */
     stmclk_init_sysclk();
+
+#if defined(CPU_FAM_STM32L1)
+    uint32_t ahb_gpio_clocks;
+    GPIO_TypeDef *port;
+
+    /* enable GPIO clock and save GPIO clock configuration */
+    ahb_gpio_clocks = RCC->AHBENR & 0xFF;
</pre>
<p>There is not definition in the cmsis header file, I also checked the newer versions and there isn't one.</p>

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