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diff --git a/wirish/stm32f2/boards_setup.cpp 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.
+ *
+ * This file controls how init() behaves on the STM32F2. Be very
+ * careful when changing anything here. Many of these values depend
+ * upon each other.
+ */
+
+#include "boards_private.h"
+
+#include <libmaple/gpio.h>
+#include <libmaple/syscfg.h>
+#include <libmaple/libmaple_types.h>
+#include <wirish/wirish_types.h>
+#include <board/board.h>
+
+// PLL config for 25 MHz external crystal --> 120 MHz SYSCLK, with
+// 48 MHz PLL48CK.
+#ifndef BOARD_PLL_Q
+#define BOARD_PLL_Q 5
+#endif
+#ifndef BOARD_PLL_P
+#define BOARD_PLL_P 2
+#endif
+#ifndef BOARD_PLL_N
+#define BOARD_PLL_N 240
+#endif
+#ifndef BOARD_PLL_M
+#define BOARD_PLL_M 25
+#endif
+
+static stm32f2_rcc_pll_data pll_data = {BOARD_PLL_Q,
+                                        BOARD_PLL_P,
+                                        BOARD_PLL_N,
+                                        BOARD_PLL_M};
+
+namespace wirish {
+    namespace priv {
+        // PLL clocked off of HSE, with above configuration data.
+        __weak rcc_pll_cfg w_board_pll_cfg = {RCC_PLLSRC_HSE, &pll_data};
+
+        // Global ADC prescaler
+        //
+        // On F2, with f_APB2 = 60 MHz, we need f_ADC = f_PCLK2 / 2 to
+        // get the (maximum) f_ADC = 30 MHz.
+        __weak adc_prescaler w_adc_pre = ADC_PRE_PCLK2_DIV_2;
+
+        // Conservative ADC sample rate. Goal is error less than 1/4
+        // LSB with 50 KOhm input impedance.
+        //
+        // On F2, with f_ADC = 30 MHz, error is acceptable assuming an
+        // internal sample and hold capacitance C_ADC at most 8.8 pF
+        // (ST doesn't specify the maximum C_ADC, so we had to take a
+        // guess). See Equation 1 and Table 61 in the F2 datasheet for
+        // more details.
+        __weak adc_smp_rate w_adc_smp = ADC_SMPR_144;
+
+        __weak void board_reset_pll(void) {
+            // Set PLLCFGR to its reset value.
+            RCC_BASE->PLLCFGR = 0x24003010; // FIXME lose the magic number.
+        }
+
+        __weak void board_setup_clock_prescalers(void) {
+            // On F2, with f_SYSCLK = 120 MHz (as determined by
+            // board_pll_cfg),
+            //
+            // f_AHB  = f_SYSCLK / 1 = 120 MHz
+            // f_APB1 = f_AHB / 4    =  30 MHz
+            // f_APB2 = f_AHB / 2    =  60 MHz
+            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);
+        }
+
+        __weak void board_setup_gpio(void) {
+            gpio_init_all();
+        }
+
+        __weak void board_setup_usb(void) {
+            // Nothing to do.
+        }
+
+        __weak void series_init(void) {
+            // We need SYSCFG for external interrupts
+            syscfg_init();
+            // Turn on the I/O compensation cell, since we drive the
+            // GPIOs quickly by default.
+            syscfg_enable_io_compensation();
+        }
+
+    }
+}