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diff --git a/wirish/stm32f2/boards_setup.cpp b/wirish/stm32f2/boards_setup.cpp
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+++ b/wirish/stm32f2/boards_setup.cpp
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2012 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file wirish/stm32f2/boards_setup.cpp
+ * @author Marti Bolivar <mbolivar@leaflabs.com>
+ * @brief STM32F2 chip setup.
+ */
+
+#include <libmaple/rcc.h>
+#include <libmaple/gpio.h>
+
+#define PLL_Q 5
+#define PLL_P 2
+#define PLL_N 240
+#define PLL_M 25
+static stm32f2_rcc_pll_data pll_data = {PLL_Q, PLL_P, PLL_N, PLL_M};
+
+namespace wirish {
+    namespace priv {
+        rcc_pll_cfg board_pll_cfg = {RCC_PLLSRC_HSE, &pll_data};
+
+        void board_reset_pll(void) {
+            // Set PLLCFGR to its reset value.
+            RCC_BASE->PLLCFGR = 0x24003010; // FIXME lose the magic number.
+        }
+
+        void board_setup_clock_prescalers(void) {
+            rcc_set_prescaler(RCC_PRESCALER_AHB, RCC_AHB_SYSCLK_DIV_1);
+            rcc_set_prescaler(RCC_PRESCALER_APB1, RCC_APB1_HCLK_DIV_4);
+            rcc_set_prescaler(RCC_PRESCALER_APB2, RCC_APB2_HCLK_DIV_2);
+        }
+
+        void board_setup_gpio(void) {
+            gpio_init_all();
+        }
+
+        void board_setup_adc(void) {
+            // TODO
+        }
+
+        void board_setup_timers(void) {
+            // TODO
+        }
+
+        void board_setup_usb(void) {
+            // TODO
+        }
+
+    }
+}
+