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diff --git a/wirish/stm32f1/boards_setup.cpp b/wirish/stm32f1/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/stm32f1/boards_setup.cpp
+ * @author Marti Bolivar <mbolivar@leaflabs.com>
+ * @brief STM32F1 chip setup.
+ *
+ * This file controls how init() behaves on the STM32F1. 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/timer.h>
+
+#include <wirish/boards.h>
+#include <wirish/usb_serial.h>
+
+// Allow boards to provide a PLL multiplier. This is useful for
+// e.g. STM32F100 value line MCUs, which use slower multipliers.
+// (We're leaving the default to RCC_PLLMUL_9 for now, since that
+// works for F103 performance line MCUs, which is all that LeafLabs
+// currently officially supports).
+#ifndef BOARD_RCC_PLLMUL
+#define BOARD_RCC_PLLMUL RCC_PLLMUL_9
+#endif
+
+namespace wirish {
+    namespace priv {
+
+        static stm32f1_rcc_pll_data pll_data = {BOARD_RCC_PLLMUL};
+        __weak rcc_pll_cfg w_board_pll_cfg = {RCC_PLLSRC_HSE, &pll_data};
+        __weak adc_prescaler w_adc_pre = ADC_PRE_PCLK2_DIV_6;
+        __weak adc_smp_rate w_adc_smp = ADC_SMPR_55_5;
+
+        __weak void board_reset_pll(void) {
+            // TODO
+        }
+
+        __weak 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_2);
+            rcc_set_prescaler(RCC_PRESCALER_APB2, RCC_APB2_HCLK_DIV_1);
+        }
+
+        __weak void board_setup_gpio(void) {
+            gpio_init_all();
+        }
+
+        __weak void board_setup_usb(void) {
+#if BOARD_HAVE_SERIALUSB
+            SerialUSB.begin();
+#endif
+        }
+
+        __weak void series_init(void) {
+            // Initialize AFIO here, too, so peripheral remaps and external
+            // interrupts work out of the box.
+            afio_init();
+        }
+
+    }
+}