diff --git a/src/stm32f1/Kconfig b/src/stm32f1/Kconfig
deleted file mode 100644
index c8b04e4c..00000000
--- a/src/stm32f1/Kconfig
+++ /dev/null
@@ -1,45 +0,0 @@
-# Kconfig settings for STM32F1 processors
-
-if MACH_STM32F1
-
-config STM32F1_SELECT
-    bool
-    default y
-    select HAVE_GPIO
-    select HAVE_GPIO_ADC
-    select HAVE_GPIO_SPI
-    select HAVE_GPIO_BITBANGING
-
-config BOARD_DIRECTORY
-    string
-    default "stm32f1"
-
-config CLOCK_FREQ
-    int
-    default 72000000
-
-choice
-    prompt "Bootloader offset"
-    config STM_FLASH_START_2000
-        bool "8KiB bootloader (stm32duino)"
-    config STM_FLASH_START_7000
-        bool "28KiB bootloader"
-    config STM_FLASH_START_0000
-        bool "No bootloader"
-endchoice
-
-config FLASH_START
-    hex
-    default 0x2000 if STM_FLASH_START_2000
-    default 0x7000 if STM_FLASH_START_7000
-    default 0x0000
-
-config USBSERIAL
-    bool "Use USB for communication (instead of serial)"
-    default y
-config SERIAL
-    depends on !USBSERIAL
-    bool
-    default y
-
-endif
diff --git a/src/stm32f1/Makefile b/src/stm32f1/Makefile
deleted file mode 100644
index 2b00b5f0..00000000
--- a/src/stm32f1/Makefile
+++ /dev/null
@@ -1,54 +0,0 @@
-# Additional STM32F1 build rules
-
-# Setup the toolchain
-CROSS_PREFIX=arm-none-eabi-
-
-dirs-y += src/stm32f1 src/generic
-dirs-y += lib/stm32f1 lib/stm32f1/gcc lib/stm32f1/hal/source
-
-CFLAGS += -mthumb -mcpu=cortex-m3
-CFLAGS += -Ilib/cmsis-core
-CFLAGS += -Ilib/stm32f1/include -Ilib/stm32f1/hal/include
-CFLAGS += -DSTM32F103xB
-
-# Add source files
-src-y += stm32f1/main.c stm32f1/gpio.c
-src-$(CONFIG_HAVE_GPIO_ADC) += stm32f1/adc.c
-src-$(CONFIG_HAVE_GPIO_SPI) += stm32f1/spi.c
-src-y += $(addprefix ../, $(wildcard lib/stm32f1/hal/source/stm32f1xx_ll_*.c))
-src-y += generic/crc16_ccitt.c generic/armcm_irq.c generic/armcm_timer.c
-src-y += ../lib/stm32f1/system_stm32f1xx.c
-src-$(CONFIG_USBSERIAL) += stm32f1/usbserial.c generic/usb_cdc.c
-src-$(CONFIG_SERIAL) += stm32f1/serial.c generic/serial_irq.c
-
-# Add assembler build rules
-$(OUT)%.o: %.s $(OUT)autoconf.h $(OUT)board-link
-	@echo "  Assembling $@"
-	$(Q)$(AS) $< -o $@
-
-asmsrc-y = ../lib/stm32f1/gcc/startup_stm32f103xb.s
-OBJS_klipper.elf += $(patsubst %.s, $(OUT)src/%.o,$(asmsrc-y))
-
-# Build the linker script
-$(OUT)stm32f1.ld: src/stm32f1/stm32f1.ld $(OUT)board-link
-	@echo "  Preprocessing $@"
-	$(Q)$(CPP) -P -MD -MT $@ -DFLASH_START=$(CONFIG_FLASH_START) $< -o $@
-
-CFLAGS_klipper.elf += -T $(OUT)stm32f1.ld
-CFLAGS_klipper.elf += --specs=nano.specs --specs=nosys.specs
-$(OUT)klipper.elf : $(OUT)stm32f1.ld
-
-# Binary output file rules
-target-y += $(OUT)klipper.bin
-
-$(OUT)klipper.bin: $(OUT)klipper.elf
-	@echo "  Creating hex file $@"
-	$(Q)$(OBJCOPY) -O binary $< $@
-
-flash: $(OUT)klipper.bin
-	@echo "  Flashing $< to $(FLASH_DEVICE)"
-	$(Q)$(PYTHON) ./scripts/flash_usb.py -t stm32f1 -d "$(FLASH_DEVICE)" $(if $(NOSUDO),--no-sudo) $(OUT)klipper.bin
-
-serialflash: $(OUT)klipper.bin
-	@echo "  Flashing $< to $(FLASH_DEVICE) via stm32flash"
-	$(Q)stm32flash -w $< -v -g 0 $(FLASH_DEVICE)
diff --git a/src/stm32f1/adc.c b/src/stm32f1/adc.c
deleted file mode 100644
index 47271d3e..00000000
--- a/src/stm32f1/adc.c
+++ /dev/null
@@ -1,110 +0,0 @@
-// ADC functions on STM32F1
-//
-// Copyright (C) 2018 Grigori Goronzy <greg@kinoho.net>
-//
-// This file may be distributed under the terms of the GNU GPLv3 license.
-
-#include <stdbool.h> // bool
-#include "board/io.h" // readb
-#include "command.h" // shutdown
-#include "compiler.h" // ARRAY_SIZE
-#include "gpio.h" // gpio_adc_setup
-#include "internal.h" // GPIO
-#include "stm32f1xx_ll_adc.h" // LL_ADC_REG_ReadConversionData12
-#include "stm32f1xx_ll_gpio.h" // LL_GPIO_SetPinMode
-#include "sched.h" // sched_shutdown
-
-DECL_CONSTANT("ADC_MAX", 4095);
-
-#define ADC_DELAY (240 * 8)
-
-static bool adc_busy;
-static uint32_t adc_current_channel;
-
-static const uint8_t adc_pins[] = {
-    GPIO('A', 0), GPIO('A', 1), GPIO('A', 2), GPIO('A', 3),
-    GPIO('A', 4), GPIO('A', 5), GPIO('A', 6), GPIO('A', 7),
-    GPIO('B', 0), GPIO('B', 1), GPIO('C', 0), GPIO('C', 1),
-    GPIO('C', 2), GPIO('C', 3), GPIO('C', 4), GPIO('C', 5)
-};
-
-static const uint32_t adc_channels[] = {
-    LL_ADC_CHANNEL_0,
-    LL_ADC_CHANNEL_1,
-    LL_ADC_CHANNEL_2,
-    LL_ADC_CHANNEL_3,
-    LL_ADC_CHANNEL_4,
-    LL_ADC_CHANNEL_5,
-    LL_ADC_CHANNEL_6,
-    LL_ADC_CHANNEL_7,
-    LL_ADC_CHANNEL_8,
-    LL_ADC_CHANNEL_9,
-    LL_ADC_CHANNEL_10,
-    LL_ADC_CHANNEL_11,
-    LL_ADC_CHANNEL_12,
-    LL_ADC_CHANNEL_13,
-    LL_ADC_CHANNEL_14,
-    LL_ADC_CHANNEL_15,
-};
-
-struct gpio_adc
-gpio_adc_setup(uint8_t pin)
-{
-    // Find pin in adc_pins table
-    int chan;
-    for (chan=0; ; chan++) {
-        if (chan >= ARRAY_SIZE(adc_pins))
-            shutdown("Not a valid ADC pin");
-        if (adc_pins[chan] == pin)
-            break;
-    }
-
-    GPIO_TypeDef *regs = digital_regs[GPIO2PORT(pin)];
-    uint32_t bit = digital_pins[pin % 16];
-    LL_GPIO_SetPinMode(regs, bit, LL_GPIO_MODE_ANALOG);
-
-    return (struct gpio_adc){ .bit = adc_channels[chan] };
-}
-
-// Try to sample a value. Returns zero if sample ready, otherwise
-// returns the number of clock ticks the caller should wait before
-// retrying this function.
-uint32_t
-gpio_adc_sample(struct gpio_adc g)
-{
-    /* ADC not busy, start conversion */
-    if (!readb(&adc_busy)) {
-        LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_1, g.bit);
-        LL_ADC_SetChannelSamplingTime(ADC1, g.bit
-                                      , LL_ADC_SAMPLINGTIME_41CYCLES_5);
-        LL_ADC_REG_StartConversionSWStart(ADC1);
-        adc_busy = true;
-        adc_current_channel = g.bit;
-        return ADC_DELAY;
-    /* ADC finished conversion for this channel */
-    } else if (LL_ADC_IsActiveFlag_EOS(ADC1) &&
-               readl(&adc_current_channel) == g.bit) {
-        LL_ADC_ClearFlag_EOS(ADC1);
-        adc_busy = false;
-        return 0;
-    }
-    /* Wants to sample another channel, or not finished yet */
-    return ADC_DELAY;
-}
-
-// Read a value; use only after gpio_adc_sample() returns zero
-uint16_t
-gpio_adc_read(struct gpio_adc g)
-{
-    return LL_ADC_REG_ReadConversionData12(ADC1);
-}
-
-// Cancel a sample that may have been started with gpio_adc_sample()
-void
-gpio_adc_cancel_sample(struct gpio_adc g)
-{
-    if (readb(&adc_busy) && readl(&adc_current_channel) == g.bit) {
-        adc_busy = false;
-        LL_ADC_ClearFlag_EOS(ADC1);
-    }
-}
diff --git a/src/stm32f1/gpio.c b/src/stm32f1/gpio.c
deleted file mode 100644
index ced64cd1..00000000
--- a/src/stm32f1/gpio.c
+++ /dev/null
@@ -1,135 +0,0 @@
-// GPIO functions on STM32F1
-//
-// Copyright (C) 2018 Grigori Goronzy <greg@kinoho.net>
-//
-// This file may be distributed under the terms of the GNU GPLv3 license.
-
-#include "board/irq.h" // irq_save
-#include "command.h" // shutdown
-#include "compiler.h" // ARRAY_SIZE
-#include "gpio.h" // gpio_out_setup
-#include "internal.h" // GPIO
-#include "stm32f1xx_ll_gpio.h" // LL_GPIO_SetPinMode
-#include "sched.h" // sched_shutdown
-
-
-/****************************************************************
- * Pin mappings
- ****************************************************************/
-
-DECL_ENUMERATION_RANGE("pin", "PA0", GPIO('A', 0), 16);
-DECL_ENUMERATION_RANGE("pin", "PB0", GPIO('B', 0), 16);
-DECL_ENUMERATION_RANGE("pin", "PC0", GPIO('C', 0), 16);
-DECL_ENUMERATION_RANGE("pin", "PD0", GPIO('D', 0), 16);
-DECL_ENUMERATION_RANGE("pin", "PE0", GPIO('E', 0), 16);
-
-GPIO_TypeDef *const digital_regs[] = {
-    GPIOA, GPIOB, GPIOC, GPIOD, GPIOE
-};
-
-uint32_t const digital_pins[] = {
-    LL_GPIO_PIN_0,
-    LL_GPIO_PIN_1,
-    LL_GPIO_PIN_2,
-    LL_GPIO_PIN_3,
-    LL_GPIO_PIN_4,
-    LL_GPIO_PIN_5,
-    LL_GPIO_PIN_6,
-    LL_GPIO_PIN_7,
-    LL_GPIO_PIN_8,
-    LL_GPIO_PIN_9,
-    LL_GPIO_PIN_10,
-    LL_GPIO_PIN_11,
-    LL_GPIO_PIN_12,
-    LL_GPIO_PIN_13,
-    LL_GPIO_PIN_14,
-    LL_GPIO_PIN_15,
-};
-
-/****************************************************************
- * General Purpose Input Output (GPIO) pins
- ****************************************************************/
-
-struct gpio_out
-gpio_out_setup(uint8_t pin, uint8_t val)
-{
-    if (GPIO2PORT(pin) >= ARRAY_SIZE(digital_regs))
-        goto fail;
-    GPIO_TypeDef *regs = digital_regs[GPIO2PORT(pin)];
-    uint32_t bit = digital_pins[pin % 16];
-    struct gpio_out g = { .regs=regs, .bit=bit };
-    gpio_out_reset(g, val);
-    return g;
-fail:
-    shutdown("Not an output pin");
-}
-
-void
-gpio_out_reset(struct gpio_out g, uint8_t val)
-{
-    irqstatus_t flag = irq_save();
-    if (val)
-        LL_GPIO_SetOutputPin(g.regs, g.bit);
-    else
-        LL_GPIO_ResetOutputPin(g.regs, g.bit);
-    LL_GPIO_SetPinMode(g.regs, g.bit, LL_GPIO_MODE_OUTPUT);
-    irq_restore(flag);
-}
-
-void
-gpio_out_toggle_noirq(struct gpio_out g)
-{
-    LL_GPIO_TogglePin(g.regs, g.bit);
-}
-
-void
-gpio_out_toggle(struct gpio_out g)
-{
-    irqstatus_t flag = irq_save();
-    gpio_out_toggle_noirq(g);
-    irq_restore(flag);
-}
-
-void
-gpio_out_write(struct gpio_out g, uint8_t val)
-{
-    if (val)
-        LL_GPIO_SetOutputPin(g.regs, g.bit);
-    else
-        LL_GPIO_ResetOutputPin(g.regs, g.bit);
-}
-
-
-struct gpio_in
-gpio_in_setup(uint8_t pin, int8_t pull_up)
-{
-    if (GPIO2PORT(pin) >= ARRAY_SIZE(digital_regs))
-        goto fail;
-    GPIO_TypeDef *regs = digital_regs[GPIO2PORT(pin)];
-    uint32_t bit = digital_pins[pin % 16];
-    struct gpio_in g = { .regs = regs, .bit = bit };
-    gpio_in_reset(g, pull_up);
-    return g;
-fail:
-    shutdown("Not an input pin");
-}
-
-void
-gpio_in_reset(struct gpio_in g, int8_t pull_up)
-{
-    irqstatus_t flag = irq_save();
-    if (pull_up) {
-        LL_GPIO_SetPinMode(g.regs, g.bit, LL_GPIO_MODE_INPUT);
-        uint32_t p = pull_up > 0 ? LL_GPIO_PULL_UP : LL_GPIO_PULL_DOWN;
-        LL_GPIO_SetPinPull(g.regs, g.bit, p);
-    } else {
-        LL_GPIO_SetPinMode(g.regs, g.bit, LL_GPIO_MODE_FLOATING);
-    }
-    irq_restore(flag);
-}
-
-uint8_t
-gpio_in_read(struct gpio_in g)
-{
-    return LL_GPIO_IsInputPinSet(g.regs, g.bit);
-}
diff --git a/src/stm32f1/gpio.h b/src/stm32f1/gpio.h
deleted file mode 100644
index 8aba2f85..00000000
--- a/src/stm32f1/gpio.h
+++ /dev/null
@@ -1,43 +0,0 @@
-#ifndef __STM32F1_GPIO_H
-#define __STM32F1_GPIO_H
-
-#include <stdint.h>
-#include "stm32f1xx.h"
-
-void gpio_peripheral(char bank, uint32_t bit, char ptype, uint32_t pull_up);
-
-struct gpio_out {
-    GPIO_TypeDef *regs;
-    uint32_t bit;
-};
-struct gpio_out gpio_out_setup(uint8_t pin, uint8_t val);
-void gpio_out_reset(struct gpio_out g, uint8_t val);
-void gpio_out_toggle_noirq(struct gpio_out g);
-void gpio_out_toggle(struct gpio_out g);
-void gpio_out_write(struct gpio_out g, uint8_t val);
-
-struct gpio_in {
-    GPIO_TypeDef *regs;
-    uint32_t bit;
-};
-struct gpio_in gpio_in_setup(uint8_t pin, int8_t pull_up);
-void gpio_in_reset(struct gpio_in g, int8_t pull_up);
-uint8_t gpio_in_read(struct gpio_in g);
-
-struct gpio_adc {
-    uint32_t bit;
-};
-struct gpio_adc gpio_adc_setup(uint8_t pin);
-uint32_t gpio_adc_sample(struct gpio_adc g);
-uint16_t gpio_adc_read(struct gpio_adc g);
-void gpio_adc_cancel_sample(struct gpio_adc g);
-
-struct spi_config {
-    uint32_t spi_cr1;
-};
-struct spi_config spi_setup(uint32_t bus, uint8_t mode, uint32_t rate);
-void spi_prepare(struct spi_config config);
-void spi_transfer(struct spi_config config, uint8_t receive_data,
-                  uint8_t len, uint8_t *data);
-
-#endif // gpio.h
diff --git a/src/stm32f1/internal.h b/src/stm32f1/internal.h
deleted file mode 100644
index 4c4394fd..00000000
--- a/src/stm32f1/internal.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef __STM32F1_INTERNAL_H
-#define __STM32F1_INTERNAL_H
-// Local definitions for STM32F1 code
-
-#include "stm32f1xx.h"
-
-#define GPIO(PORT, NUM) (((PORT)-'A') * 16 + (NUM))
-#define GPIO2PORT(PIN) ((PIN) / 16)
-
-extern GPIO_TypeDef *const digital_regs[];
-extern uint32_t const digital_pins[];
-
-#endif // internal.h
diff --git a/src/stm32f1/main.c b/src/stm32f1/main.c
deleted file mode 100644
index d9bdbb24..00000000
--- a/src/stm32f1/main.c
+++ /dev/null
@@ -1,148 +0,0 @@
-// Main starting point for STM32F103 boards.
-//
-// Copyright (C) 2018 Grigori Goronzy <greg@kinoho.net>
-//
-// This file may be distributed under the terms of the GNU GPLv3 license.
-
-#include "autoconf.h"
-#include "board/internal.h" // udelay
-#include "board/misc.h" // timer_read_time
-#include "command.h" // DECL_CONSTANT
-#include "stm32f1xx.h"
-#include "stm32f1xx_ll_system.h"
-#include "stm32f1xx_ll_utils.h"
-#include "stm32f1xx_ll_bus.h"
-#include "stm32f1xx_ll_rcc.h"
-#include "stm32f1xx_ll_iwdg.h"
-#include "stm32f1xx_ll_gpio.h"
-#include "stm32f1xx_ll_adc.h"
-#include "stm32f1xx_ll_spi.h"
-#include "sched.h" // sched_main
-
-DECL_CONSTANT_STR("MCU", "stm32f103");
-
-
-/****************************************************************
- * dynamic memory pool
- ****************************************************************/
-
-static char dynmem_pool[15 * 1024];
-
-// Return the start of memory available for dynamic allocations
-void *
-dynmem_start(void)
-{
-    return dynmem_pool;
-}
-
-// Return the end of memory available for dynamic allocations
-void *
-dynmem_end(void)
-{
-    return &dynmem_pool[sizeof(dynmem_pool)];
-}
-
-
-/****************************************************************
- * watchdog handler
- ****************************************************************/
-
-void
-watchdog_reset(void)
-{
-    LL_IWDG_ReloadCounter(IWDG);
-}
-DECL_TASK(watchdog_reset);
-
-void
-watchdog_init(void)
-{
-    LL_IWDG_EnableWriteAccess(IWDG);
-    /* IWDG timer is 40 KHz, configure to trigger every seconds */
-    LL_IWDG_SetPrescaler(IWDG, LL_IWDG_PRESCALER_16);
-    LL_IWDG_SetReloadCounter(IWDG, 2500);
-    LL_IWDG_Enable(IWDG);
-
-}
-DECL_INIT(watchdog_init);
-
-
-/****************************************************************
- * misc functions
- ****************************************************************/
-
-void
-command_reset(uint32_t *args)
-{
-    NVIC_SystemReset();
-}
-DECL_COMMAND_FLAGS(command_reset, HF_IN_SHUTDOWN, "reset");
-
-void clock_config(void)
-{
-    LL_RCC_HSE_Enable();
-    while (!LL_RCC_HSE_IsReady());
-    LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLL_MUL_9);
-    LL_RCC_PLL_Disable();
-    LL_RCC_PLL_Enable();
-    while (!LL_RCC_PLL_IsReady());
-    LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
-    LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
-    LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_2);
-    LL_RCC_SetADCClockSource(LL_RCC_ADC_CLKSRC_PCLK2_DIV_4);
-    LL_FLASH_SetLatency(LL_FLASH_LATENCY_2);
-    LL_FLASH_EnablePrefetch();
-    LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
-    SystemCoreClockUpdate();
-    LL_Init1msTick(SystemCoreClock);
-}
-
-void adc_config(void)
-{
-    LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_ADC1);
-    /* ADC might be in deep sleep, needs to be woken up twice in that case */
-    LL_ADC_Enable(ADC1);
-    LL_mDelay(1);
-    LL_ADC_Enable(ADC1);
-    LL_mDelay(1);
-    LL_ADC_StartCalibration(ADC1);
-    while (LL_ADC_IsCalibrationOnGoing(ADC1));
-    LL_ADC_SetSequencersScanMode(ADC1, LL_ADC_SEQ_SCAN_DISABLE);
-    LL_ADC_REG_SetTriggerSource(ADC1, LL_ADC_REG_TRIG_SOFTWARE);
-    LL_ADC_REG_SetSequencerLength(ADC1, LL_ADC_REG_SEQ_SCAN_DISABLE);
-}
-
-void spi_config(void)
-{
-    LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_SPI2);
-}
-
-void io_config(void)
-{
-    LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_AFIO);
-    LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOA);
-    LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOB);
-    LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOC);
-    LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOD);
-    LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOE);
-    /* JTAG is normally not needed, but blocks ports like PB3, PB4 */
-    LL_GPIO_AF_Remap_SWJ_NOJTAG();
-    /* Likewise, we don't need PB3 for TRACESWO output */
-    LL_DBGMCU_SetTracePinAssignment(LL_DBGMCU_TRACE_NONE);
-}
-
-// Main entry point
-int
-main(void)
-{
-    SystemInit();
-    SCB->VTOR += CONFIG_FLASH_START;
-
-    LL_Init1msTick(SystemCoreClock);
-    clock_config();
-    adc_config();
-    io_config();
-    spi_config();
-    sched_main();
-    return 0;
-}
diff --git a/src/stm32f1/serial.c b/src/stm32f1/serial.c
deleted file mode 100644
index e1699334..00000000
--- a/src/stm32f1/serial.c
+++ /dev/null
@@ -1,65 +0,0 @@
-// STM32F1 serial port
-//
-// Copyright (C) 2018 Grigori Goronzy <greg@kinoho.net>
-//
-// This file may be distributed under the terms of the GNU GPLv3 license.
-
-#include <stdint.h>
-#include "autoconf.h" // CONFIG_SERIAL_BAUD
-#include "board/serial_irq.h" // serial_rx_byte
-#include "sched.h" // DECL_INIT
-#include "stm32f1xx.h" // UART
-#include "stm32f1xx_ll_bus.h"
-#include "stm32f1xx_ll_rcc.h"
-#include "stm32f1xx_ll_usart.h"
-#include "stm32f1xx_ll_gpio.h"
-
-void
-serial_init(void)
-{
-    const uint32_t pclk = __LL_RCC_CALC_PCLK2_FREQ(SystemCoreClock
-                                                   , LL_RCC_GetAPB2Prescaler());
-
-    LL_APB2_GRP1_ForceReset(LL_APB2_GRP1_PERIPH_USART1);
-    LL_APB2_GRP1_ReleaseReset(LL_APB2_GRP1_PERIPH_USART1);
-    LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_USART1);
-    LL_USART_SetBaudRate(USART1, pclk, CONFIG_SERIAL_BAUD);
-    LL_USART_SetDataWidth(USART1, LL_USART_DATAWIDTH_8B);
-    LL_USART_SetParity(USART1, LL_USART_PARITY_NONE);
-    LL_USART_SetStopBitsLength(USART1, LL_USART_STOPBITS_1);
-    LL_USART_SetHWFlowCtrl(USART1, LL_USART_HWCONTROL_NONE);
-    LL_USART_SetTransferDirection(USART1, LL_USART_DIRECTION_TX_RX);
-    LL_USART_EnableIT_RXNE(USART1);
-    NVIC_SetPriority(USART1_IRQn, 0);
-    NVIC_EnableIRQ(USART1_IRQn);
-    LL_USART_Enable(USART1);
-
-    LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOA);
-    LL_GPIO_AF_DisableRemap_USART1();
-    LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_9, LL_GPIO_PULL_UP);
-    LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_9, LL_GPIO_MODE_ALTERNATE);
-    LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_10, LL_GPIO_PULL_UP);
-    LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_10, LL_GPIO_MODE_INPUT);
-}
-DECL_INIT(serial_init);
-
-void __visible
-USART1_IRQHandler(void)
-{
-    if (LL_USART_IsActiveFlag_RXNE(USART1) || LL_USART_IsActiveFlag_ORE(USART1))
-        serial_rx_byte(LL_USART_ReceiveData8(USART1));
-    if (LL_USART_IsActiveFlag_TXE(USART1)) {
-        uint8_t data;
-        int ret = serial_get_tx_byte(&data);
-        if (ret)
-            LL_USART_DisableIT_TXE(USART1);
-        else
-            LL_USART_TransmitData8(USART1, data);
-    }
-}
-
-void
-serial_enable_tx_irq(void)
-{
-    LL_USART_EnableIT_TXE(USART1);
-}
diff --git a/src/stm32f1/spi.c b/src/stm32f1/spi.c
deleted file mode 100644
index 5b9ffda2..00000000
--- a/src/stm32f1/spi.c
+++ /dev/null
@@ -1,111 +0,0 @@
-// SPI functions on STM32F1
-//
-// Copyright (C) 2018 Grigori Goronzy <greg@kinoho.net>
-//
-// This file may be distributed under the terms of the GNU GPLv3 license.
-
-#include "command.h" // shutdown
-#include "gpio.h" // spi_setup
-#include "sched.h" // sched_shutdown
-#include "stm32f1xx_ll_gpio.h" // LL_GPIO_SetPinMode
-#include "stm32f1xx_ll_rcc.h" // __LL_RCC_CALC_PCLK1_FREQ
-#include "stm32f1xx_ll_spi.h" // LL_SPI_Enable
-
-static void spi_set_mode(SPI_TypeDef *spi, uint8_t mode)
-{
-    switch (mode) {
-    case 0:
-        LL_SPI_SetClockPolarity(spi, LL_SPI_POLARITY_LOW);
-        LL_SPI_SetClockPhase(spi, LL_SPI_PHASE_1EDGE);
-        break;
-    case 1:
-        LL_SPI_SetClockPolarity(spi, LL_SPI_POLARITY_LOW);
-        LL_SPI_SetClockPhase(spi, LL_SPI_PHASE_2EDGE);
-        break;
-    case 2:
-        LL_SPI_SetClockPolarity(spi, LL_SPI_POLARITY_HIGH);
-        LL_SPI_SetClockPhase(spi, LL_SPI_PHASE_1EDGE);
-        break;
-    case 3:
-        LL_SPI_SetClockPolarity(spi, LL_SPI_POLARITY_HIGH);
-        LL_SPI_SetClockPhase(spi, LL_SPI_PHASE_2EDGE);
-        break;
-    }
-}
-
-static void spi_set_baudrate(SPI_TypeDef *spi, uint32_t rate)
-{
-    const uint32_t pclk = __LL_RCC_CALC_PCLK1_FREQ(SystemCoreClock
-                                                   , LL_RCC_GetAPB1Prescaler());
-    const uint32_t prescaler = pclk / rate;
-
-    uint32_t setting = LL_SPI_BAUDRATEPRESCALER_DIV256;
-    if (prescaler <= 2)
-        setting = LL_SPI_BAUDRATEPRESCALER_DIV2;
-    else if (prescaler <= 4)
-        setting = LL_SPI_BAUDRATEPRESCALER_DIV4;
-    else if (prescaler <= 8)
-        setting = LL_SPI_BAUDRATEPRESCALER_DIV8;
-    else if (prescaler <= 16)
-        setting = LL_SPI_BAUDRATEPRESCALER_DIV16;
-    else if (prescaler <= 32)
-        setting = LL_SPI_BAUDRATEPRESCALER_DIV32;
-    else if (prescaler <= 64)
-        setting = LL_SPI_BAUDRATEPRESCALER_DIV64;
-    else if (prescaler <= 128)
-        setting = LL_SPI_BAUDRATEPRESCALER_DIV128;
-
-    LL_SPI_SetBaudRatePrescaler(spi, setting);
-}
-
-static void spi_init_pins(void)
-{
-    LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_13, LL_GPIO_MODE_ALTERNATE);
-    LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_14, LL_GPIO_MODE_INPUT);
-    LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_15, LL_GPIO_MODE_ALTERNATE);
-    LL_GPIO_SetPinOutputType(GPIOB, LL_GPIO_PIN_13, LL_GPIO_OUTPUT_PUSHPULL);
-    LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_14, LL_GPIO_PULL_UP);
-    LL_GPIO_SetPinOutputType(GPIOB, LL_GPIO_PIN_15, LL_GPIO_OUTPUT_PUSHPULL);
-}
-
-struct spi_config
-spi_setup(uint32_t bus, uint8_t mode, uint32_t rate)
-{
-    if (bus > 0 || !rate)
-        shutdown("Invalid spi_setup parameters");
-
-    spi_init_pins();
-    SPI_TypeDef spi_hw = { };
-    LL_SPI_SetNSSMode(&spi_hw, LL_SPI_NSS_SOFT);
-    LL_SPI_SetMode(&spi_hw, LL_SPI_MODE_MASTER);
-    spi_set_mode(&spi_hw, mode);
-    spi_set_baudrate(&spi_hw, rate);
-    LL_SPI_Enable(&spi_hw);
-
-    return (struct spi_config){ .spi_cr1 = spi_hw.CR1 };
-}
-
-void
-spi_prepare(struct spi_config config)
-{
-    SPI2->CR1 = config.spi_cr1;
-}
-
-void
-spi_transfer(struct spi_config config, uint8_t receive_data,
-             uint8_t len, uint8_t *data)
-{
-    while (len--) {
-        LL_SPI_TransmitData8(SPI2, *data);
-        while (!LL_SPI_IsActiveFlag_TXE(SPI2));
-        while (!LL_SPI_IsActiveFlag_RXNE(SPI2));
-        uint8_t rdata = LL_SPI_ReceiveData8(SPI2);
-        if (receive_data) {
-            *data = rdata;
-        }
-        data++;
-    }
-
-    while (LL_SPI_IsActiveFlag_BSY(SPI2));
-    LL_SPI_Disable(SPI2);
-}
diff --git a/src/stm32f1/stm32f1.ld b/src/stm32f1/stm32f1.ld
deleted file mode 100644
index f8735437..00000000
--- a/src/stm32f1/stm32f1.ld
+++ /dev/null
@@ -1,109 +0,0 @@
-/* Cortex-M linker script */
-
-ENTRY(Reset_Handler)
-
-MEMORY
-{
-  FLASH (rx) : ORIGIN = 0x08000000 + FLASH_START, LENGTH = 64K - FLASH_START
-  RAM  (xrw) : ORIGIN = 0x20000000, LENGTH = 20K
-}
-
-/* highest address of the user mode stack */
-_estack = 0x20005000;
-
-SECTIONS
-{
-    /* Interrupt vector table */
-    .isr_vector :
-    {
-        . = ALIGN(4);
-        KEEP(*(.isr_vector))
-        . = ALIGN(4);
-    } >FLASH
-
-    /* Program code and constant data */
-    .text :
-    {
-        . = ALIGN(4);
-        *(.text)
-        *(.text*)
-        *(.rodata)
-        *(.rodata*)
-        KEEP (*(.init))
-        KEEP (*(.fini))
-        . = ALIGN(4);
-        _etext = .;
-    } >FLASH
-
-    /* Exception handling */
-    .ARM.extab   : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH
-    .ARM : {
-        __exidx_start = .;
-        *(.ARM.exidx*)
-        __exidx_end = .;
-    } >FLASH
-
-    /* Static constructor initialization (C++) */
-    .preinit_array :
-    {
-        PROVIDE_HIDDEN (__preinit_array_start = .);
-        KEEP (*(.preinit_array*))
-        PROVIDE_HIDDEN (__preinit_array_end = .);
-    } >FLASH
-    .init_array :
-    {
-        PROVIDE_HIDDEN (__init_array_start = .);
-        KEEP (*(SORT(.init_array.*)))
-        KEEP (*(.init_array*))
-        PROVIDE_HIDDEN (__init_array_end = .);
-    } >FLASH
-    .fini_array :
-    {
-        PROVIDE_HIDDEN (__fini_array_start = .);
-        KEEP (*(SORT(.fini_array.*)))
-        KEEP (*(.fini_array*))
-        PROVIDE_HIDDEN (__fini_array_end = .);
-    } >FLASH
-
-
-    /* Initialized data, needs to be handled by startup code */
-    _sidata = .;
-    .data : AT (_sidata)
-    {
-        . = ALIGN(4);
-        _sdata = . ;
-        _data = . ;
-        *(.data)
-        *(.data*)
-        *(.RAMtext)
-        . = ALIGN(4);
-        _edata = . ;
-    } >RAM
-
-    /* Uninitialized data */
-    .bss (NOLOAD) :
-    {
-        . = ALIGN(4);
-        _sbss = .;
-        __bss_start__ = .;
-        _bss = .;
-        *(.bss)
-        *(.bss*)
-        *(COMMON)
-        . = ALIGN(4);
-        _ebss = .;
-        __bss_end__ = _ebss;
-    } >RAM
-
-    /* Pointers to end of data for dynamic memory management */
-    PROVIDE (end = _ebss);
-    PROVIDE (_end = _ebss);
-
-    /* Remove debugging from standard libraries */
-    /DISCARD/ :
-    {
-        libc.a (*)
-        libm.a (*)
-        libgcc.a (*)
-    }
-}
diff --git a/src/stm32f1/usbserial.c b/src/stm32f1/usbserial.c
deleted file mode 100644
index 3bdf86a8..00000000
--- a/src/stm32f1/usbserial.c
+++ /dev/null
@@ -1,305 +0,0 @@
-// Hardware interface to "fullspeed USB controller" on stm32f1
-//
-// Copyright (C) 2018  Kevin O'Connor <kevin@koconnor.net>
-//
-// This file may be distributed under the terms of the GNU GPLv3 license.
-
-#include <string.h> // NULL
-#include "autoconf.h" // CONFIG_STM_FLASH_START_2000
-#include "board/armcm_timer.h" // udelay
-#include "board/gpio.h" // gpio_out_setup
-#include "board/io.h" // writeb
-#include "board/irq.h" // irq_disable
-#include "board/usb_cdc.h" // usb_notify_ep0
-#include "board/usb_cdc_ep.h" // USB_CDC_EP_BULK_IN
-#include "internal.h" // GPIO
-#include "sched.h" // DECL_INIT
-#include "stm32f1xx.h" // USB
-
-
-/****************************************************************
- * USB transfer memory
- ****************************************************************/
-
-struct ep_desc {
-    uint32_t addr_tx, count_tx, addr_rx, count_rx;
-};
-
-struct ep_mem {
-    struct ep_desc ep0, ep_acm, ep_bulk_out, ep_bulk_in;
-    uint32_t ep0_tx[USB_CDC_EP0_SIZE / 2];
-    uint32_t ep0_rx[USB_CDC_EP0_SIZE / 2];
-    uint32_t ep_acm_tx[USB_CDC_EP_ACM_SIZE / 2];
-    uint32_t ep_bulk_out_rx[USB_CDC_EP_BULK_OUT_SIZE / 2];
-    uint32_t ep_bulk_in_tx[USB_CDC_EP_BULK_IN_SIZE / 2];
-};
-
-#define USB_BTABLE ((struct ep_mem *)(USB_BASE + 0x400))
-
-#define CALC_ADDR(p) (((void*)(p) - (void*)USB_BTABLE) / 2)
-#define CALC_SIZE(s) ((s) > 32 ? (DIV_ROUND_UP((s), 32) << 10) | 0x8000 \
-                      : DIV_ROUND_UP((s), 2) << 10)
-
-// Setup the transfer descriptors in dedicated usb memory
-static void
-btable_configure(void)
-{
-    USB_BTABLE->ep0.count_tx = 0;
-    USB_BTABLE->ep0.addr_tx = CALC_ADDR(USB_BTABLE->ep0_tx);
-    USB_BTABLE->ep0.count_rx = CALC_SIZE(USB_CDC_EP0_SIZE);
-    USB_BTABLE->ep0.addr_rx = CALC_ADDR(USB_BTABLE->ep0_rx);
-
-    USB_BTABLE->ep_acm.count_tx = 0;
-    USB_BTABLE->ep_acm.addr_tx = CALC_ADDR(USB_BTABLE->ep_acm_tx);
-
-    USB_BTABLE->ep_bulk_out.count_rx = CALC_SIZE(USB_CDC_EP_BULK_OUT_SIZE);
-    USB_BTABLE->ep_bulk_out.addr_rx = CALC_ADDR(USB_BTABLE->ep_bulk_out_rx);
-
-    USB_BTABLE->ep_bulk_in.count_tx = 0;
-    USB_BTABLE->ep_bulk_in.addr_tx = CALC_ADDR(USB_BTABLE->ep_bulk_in_tx);
-}
-
-// Read a packet stored in dedicated usb memory
-static void
-btable_read_packet(uint8_t *dest, uint32_t *src, int count)
-{
-    uint_fast8_t i;
-    for (i=0; i<(count/2); i++) {
-        uint32_t d = *src++;
-        *dest++ = d;
-        *dest++ = d >> 8;
-    }
-    if (count & 1)
-        *dest = *src;
-}
-
-// Write a packet to dedicated usb memory
-static void
-btable_write_packet(uint32_t *dest, const uint8_t *src, int count)
-{
-    int i;
-    for (i=0; i<(count/2); i++) {
-        uint8_t b1 = *src++, b2 = *src++;
-        *dest++ = b1 | (b2 << 8);
-    }
-    if (count & 1)
-        *dest = *src;
-}
-
-
-/****************************************************************
- * USB endpoint register
- ****************************************************************/
-
-#define USB_EPR ((volatile uint32_t *)USB_BASE)
-
-#define EP_BULK (0 << USB_EP0R_EP_TYPE_Pos)
-#define EP_CONTROL (1 << USB_EP0R_EP_TYPE_Pos)
-#define EP_INTERRUPT (3 << USB_EP0R_EP_TYPE_Pos)
-#define RX_STALL (1 << USB_EP0R_STAT_RX_Pos)
-#define RX_NAK (2 << USB_EP0R_STAT_RX_Pos)
-#define RX_VALID (3 << USB_EP0R_STAT_RX_Pos)
-#define TX_STALL (1 << USB_EP0R_STAT_TX_Pos)
-#define TX_NAK (2 << USB_EP0R_STAT_TX_Pos)
-#define TX_VALID (3 << USB_EP0R_STAT_TX_Pos)
-#define EPR_RWBITS (USB_EP0R_EA | USB_EP0R_EP_KIND | USB_EP0R_EP_TYPE)
-#define EPR_RWCBITS (USB_EP0R_CTR_RX | USB_EP0R_CTR_TX)
-
-static uint32_t
-set_stat_rx_bits(uint32_t epr, uint32_t bits)
-{
-    return ((epr & (EPR_RWBITS | USB_EP0R_STAT_RX_Msk)) ^ bits) | EPR_RWCBITS;
-}
-
-static uint32_t
-set_stat_tx_bits(uint32_t epr, uint32_t bits)
-{
-    return ((epr & (EPR_RWBITS | USB_EP0R_STAT_TX_Msk)) ^ bits) | EPR_RWCBITS;
-}
-
-static uint32_t
-set_stat_rxtx_bits(uint32_t epr, uint32_t bits)
-{
-    uint32_t mask = EPR_RWBITS | USB_EP0R_STAT_RX_Msk | USB_EP0R_STAT_TX_Msk;
-    return ((epr & mask) ^ bits) | EPR_RWCBITS;
-}
-
-
-/****************************************************************
- * USB interface
- ****************************************************************/
-
-int_fast8_t
-usb_read_bulk_out(void *data, uint_fast8_t max_len)
-{
-    uint32_t epr = USB_EPR[USB_CDC_EP_BULK_OUT];
-    if ((epr & USB_EP0R_STAT_RX_Msk) == RX_VALID)
-        // No data ready
-        return -1;
-    uint32_t count = USB_BTABLE->ep_bulk_out.count_rx & 0x3ff;
-    if (count > max_len)
-        count = max_len;
-    btable_read_packet(data, USB_BTABLE->ep_bulk_out_rx, count);
-    USB_EPR[USB_CDC_EP_BULK_OUT] = set_stat_rx_bits(epr, RX_VALID);
-    return count;
-}
-
-int_fast8_t
-usb_send_bulk_in(void *data, uint_fast8_t len)
-{
-    uint32_t epr = USB_EPR[USB_CDC_EP_BULK_IN];
-    if ((epr & USB_EP0R_STAT_TX_Msk) != TX_NAK)
-        // No buffer space available
-        return -1;
-    btable_write_packet(USB_BTABLE->ep_bulk_in_tx, data, len);
-    USB_BTABLE->ep_bulk_in.count_tx = len;
-    USB_EPR[USB_CDC_EP_BULK_IN] = set_stat_tx_bits(epr, TX_VALID);
-    return len;
-}
-
-int_fast8_t
-usb_read_ep0(void *data, uint_fast8_t max_len)
-{
-    uint32_t epr = USB_EPR[0];
-    if ((epr & USB_EP0R_STAT_RX_Msk) != RX_NAK)
-        // No data ready
-        return -1;
-    uint32_t count = USB_BTABLE->ep0.count_rx & 0x3ff;
-    if (count > max_len)
-        count = max_len;
-    btable_read_packet(data, USB_BTABLE->ep0_rx, count);
-    USB_EPR[0] = set_stat_rxtx_bits(epr, RX_VALID | TX_NAK);
-    return count;
-}
-
-int_fast8_t
-usb_read_ep0_setup(void *data, uint_fast8_t max_len)
-{
-    return usb_read_ep0(data, max_len);
-}
-
-int_fast8_t
-usb_send_ep0(const void *data, uint_fast8_t len)
-{
-    uint32_t epr = USB_EPR[0];
-    if ((epr & USB_EP0R_STAT_RX_Msk) != RX_VALID)
-        // Transfer interrupted
-        return -2;
-    if ((epr & USB_EP0R_STAT_TX_Msk) != TX_NAK)
-        // No buffer space available
-        return -1;
-    btable_write_packet(USB_BTABLE->ep0_tx, data, len);
-    USB_BTABLE->ep0.count_tx = len;
-    USB_EPR[0] = set_stat_tx_bits(epr, TX_VALID);
-    return len;
-}
-
-void
-usb_stall_ep0(void)
-{
-    USB_EPR[0] = set_stat_rxtx_bits(USB_EPR[0], RX_STALL | TX_STALL);
-}
-
-static uint8_t set_address;
-
-void
-usb_set_address(uint_fast8_t addr)
-{
-    writeb(&set_address, addr | USB_DADDR_EF);
-    usb_send_ep0(NULL, 0);
-}
-
-void
-usb_set_configure(void)
-{
-}
-
-void
-usb_request_bootloader(void)
-{
-    if (!CONFIG_STM_FLASH_START_2000)
-        return;
-    // Enter "stm32duino" bootloader
-    irq_disable();
-    RCC->APB1ENR |= RCC_APB1ENR_PWREN | RCC_APB1ENR_BKPEN;
-    PWR->CR |= PWR_CR_DBP;
-    BKP->DR10 = 0x01;
-    PWR->CR &=~ PWR_CR_DBP;
-    NVIC_SystemReset();
-}
-
-
-/****************************************************************
- * Setup and interrupts
- ****************************************************************/
-
-// Initialize the usb controller
-void
-usb_init(void)
-{
-    // Pull the D+ pin low briefly to signal a new connection
-    gpio_out_setup(GPIO('A', 12), 0);
-    udelay(5000);
-    gpio_in_setup(GPIO('A', 12), 0);
-
-    // Setup USB packet memory
-    btable_configure();
-
-    // Enable USB clock
-    RCC->APB1ENR |= RCC_APB1ENR_USBEN;
-
-    // Reset usb controller and enable interrupts
-    USB->CNTR = USB_CNTR_FRES;
-    USB->BTABLE = 0;
-    USB->DADDR = 0;
-    USB->CNTR = USB_CNTR_RESETM;
-    USB->ISTR = 0;
-    NVIC_SetPriority(USB_LP_CAN1_RX0_IRQn, 1);
-    NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
-}
-DECL_INIT(usb_init);
-
-// Configure interface after a USB reset event
-static void
-usb_reset(void)
-{
-    USB_EPR[0] = 0 | EP_CONTROL | RX_VALID | TX_NAK;
-    USB_EPR[USB_CDC_EP_ACM] = USB_CDC_EP_ACM | EP_INTERRUPT | RX_NAK | TX_NAK;
-    USB_EPR[USB_CDC_EP_BULK_OUT] = (USB_CDC_EP_BULK_OUT | EP_BULK
-                                    | RX_VALID | TX_NAK);
-    USB_EPR[USB_CDC_EP_BULK_IN] = (USB_CDC_EP_BULK_IN | EP_BULK
-                                   | RX_NAK | TX_NAK);
-
-    USB->CNTR = USB_CNTR_CTRM | USB_CNTR_RESETM;
-    USB->DADDR = USB_DADDR_EF;
-}
-
-// Main irq handler
-void __visible
-USB_LP_CAN1_RX0_IRQHandler(void)
-{
-    uint32_t istr = USB->ISTR;
-    if (istr & USB_ISTR_CTR) {
-        // Endpoint activity
-        uint32_t ep = istr & USB_ISTR_EP_ID;
-        uint32_t epr = USB_EPR[ep];
-        USB_EPR[ep] = epr & EPR_RWBITS;
-        if (ep == 0) {
-            usb_notify_ep0();
-            if (epr & USB_EP_CTR_TX && set_address) {
-                // Apply address after last "in" message transmitted
-                USB->DADDR = set_address;
-                set_address = 0;
-            }
-        } else if (ep == USB_CDC_EP_BULK_OUT) {
-            usb_notify_bulk_out();
-        } else if (ep == USB_CDC_EP_BULK_IN) {
-            usb_notify_bulk_in();
-        }
-    }
-    if (istr & USB_ISTR_RESET) {
-        // USB Reset
-        USB->ISTR = (uint16_t)~USB_ISTR_RESET;
-        usb_reset();
-    }
-}