Added support for MKR1000 board

src/machine/board_arduino_mkr1000.go

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+// +build arduino_mkr1000
+
+// This contains the pin mappings for the Arduino MKR1000 board.
+//
+// For more information, see: https://store.arduino.cc/usa/arduino-mkr1000-with-headers-mounted
+//
+package machine
+
+// used to reset into bootloader
+const RESET_MAGIC_VALUE = 0x07738135
+
+// GPIO Pins
+const (
+	RX0 Pin = PB23 // UART2 RX
+	TX1 Pin = PB22 // UART2 TX
+
+	D0 Pin = PA22 // PWM available
+	D1 Pin = PA23 // PWM available
+	D2 Pin = PA10 // PWM available
+	D3 Pin = PA11 // PWM available
+	D4 Pin = PB10 // PWM available
+	D5 Pin = PB11 // PWM available
+
+	D6  Pin = PA20 // PWM available
+	D7  Pin = PA21 // PWM available
+	D8  Pin = PA16 // PWM available
+	D9  Pin = PA17
+	D10 Pin = PA19 // PWM available
+	D11 Pin = PA08 // SDA
+	D12 Pin = PA09 // PWM available, SCL
+	D13 Pin = PB23 // RX
+	D14 Pin = PB22 // TX
+)
+
+// Analog pins
+const (
+	A0 Pin = PA02 // ADC0/AIN[0]
+	A1 Pin = PB02 // AIN[10]
+	A2 Pin = PB03 // AIN[11]
+	A3 Pin = PA04 // AIN[04]
+	A4 Pin = PA05 // AIN[05]
+	A5 Pin = PA06 // AIN[06]
+	A6 Pin = PA07 // AIN[07]
+)
+
+const (
+	LED = D6
+)
+
+// UART0 aka USBCDC pins
+const (
+	USBCDC_DM_PIN Pin = PA24
+	USBCDC_DP_PIN Pin = PA25
+)
+
+// UART1 pins
+const (
+	UART_TX_PIN Pin = PB22
+	UART_RX_PIN Pin = PB23
+)
+
+// I2C pins
+const (
+	SDA_PIN Pin = D11 // SDA
+	SCL_PIN Pin = D12 // SCL
+)
+
+// SPI pins
+const (
+	SPI0_SCK_PIN Pin = D9  // SCK: S1
+	SPI0_SDO_PIN Pin = D8  // SDO: S1
+	SPI0_SDI_PIN Pin = D10 // SDI: S1
+)
+
+// I2S pins
+const (
+	I2S_SCK_PIN Pin = PA10
+	I2S_SD_PIN  Pin = PA07
+	I2S_WS_PIN      = NoPin // TODO: figure out what this is on Arduino Nano 33.
+)
+
+// USB CDC identifiers
+const (
+	usb_STRING_PRODUCT      = "Arduino MKR1000"
+	usb_STRING_MANUFACTURER = "Arduino"
+)
+
+var (
+	usb_VID uint16 = 0x2341
+	usb_PID uint16 = 0x804e
+)

targets/arduino-mkr1000.json

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+{
+    "inherits": ["atsamd21g18a"],
+    "build-tags": ["arduino_mkr1000"],
+    "flash-command": "bossac -i -e -w -v -R -U --port={port} --offset=0x2000 {bin}",
+    "flash-1200-bps-reset": "true"
+}