嵌入式Linux开发板对比评测（ArduinoYun,树莓派,BBB,伽利略） - firemail

	Arduino Yun	Beaglebone Black	Intel Galileo	Raspberry Pi
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SoC	Atheros AR9331	Texas Instruments AM3358	Intel Quark X1000	Broadcom BCM2835
CPU	MIPS32 24K and ATmega32U4	ARM Cortex-A8	Intel X1000	ARM1176
架构	MIPS and AVR	ARMv7	i586	ARMv6
运行频率	400mhz (AR9331) and 16mhz (ATmega)	1ghz	400mhz	700mhz
内存	64MB (AR9331) and 2.5KB (ATmega)	512MB	256MB	256MB (model A) or 512MB (model B)
FPU	None (Software)	Hardware	Hardware	Hardware
GPU	None	PowerVR SGX530	None	Broadcom VideoCore IV
集成存储	16MB (AR9331) and 32KB (ATmega)	2GB (rev B) or 4GB (rev C)	8MB	None
扩展存储	MicroSD (AR9331)	MicroSD	MicroSD	SD card
网络	10/100Mbit ethernet and 802.11b/g/n WiFi	10/100Mbit ethernet	10/100Mbit ethernet	None (model A) or 10/100Mbit ethernet (model B)
电源需求	5V from USB micro B connector, or header pin.	5V from USB mini B connector, 2.1mm jack, or header pin.	5V from 2.1mm jack, or header pin.	5V from USB micro B connector, or header pin.
尺寸	2.7in x 2.1in (68.6mm x 53.3mm)	3.4in x 2.1in (86.4mm x 53.3mm)	4.2in x 2.8in (106.7mm x 71.1mm)	3.4in x 2.2in (85.6mm x 56mm)
重量	1.4oz (41g)	1.4oz (40g)	1.8oz (50g)	1.6oz (45g)
大致价格	$75(450元)	$55 (rev C)(330元), $45 (rev B)(270元)	$80(480元)	$25 (model A)(150元), $35 (model B)(210元)

	Arduino Yun	BeagleBone Black	Intel Galileo	Raspberry Pi
数字 I/O 针脚	20	65	14	17
数字 I/O 电源	5V	3.3V	3.3V or 5V (switched with jumper)	3.3V
模拟输入	12 with 10-bit ADC, 0-5V (supports external reference)	7 with 12-bit ADC, 0-1.8V (no external reference)	6 with 12-bit ADC, 0-5V (no external reference)	None
PWM 输出	7	8	6 (limited speeds prevent fine servo control)	1
UART	2 (1 wired to AR9331)	4	2 (1 exposed through 3.5mm jack)	1
SPI	1	2	1	2
I2C	1	2	1	1
USB Host	1 standard A connector (AR9331)	1 standard A connector	1 micro AB connector	1 (Model A) or 2 (Model B) standard A connector
USB Client	1 micro B connector (ATmega)	1 mini B connector	1 micro B connector	None
视频输出	None	Micro HDMI	None	HDMI, Composite RCA, DSI
视频输出	None	None	None	CSI (camera)
音频输出	None	Micro HDMI	None	HDMI, 3.5mm jack
电源输出	3.3V up to 50mA, 5V	3.3V up to 250mA, 5V up to 1A	3.3V up to 800mA, 5V up to 800mA	3.3V up to 50mA, 5V up to 300-500mA
其它	- All I/O routed to ATmega processor unless noted otherwise. - Hardware compatibility with most Arduino Leonardo compatible shields.	- Real-time support with programmable real-time units. - Many pins have multiple functions such as I2S audio, CAN bus, etc. See the wikifor more information.	- Mini-PCI Express slot. - Real-time clock with optional battery. - Mixed compatibility with Arduino shields.

性能评测使用了nbench性能测试工具，这个工具比较老了，是早期用来测试奔腾类的CPU，他会运行一此类似数据压缩之类的测试，每个测试会产生一个综合内存、整数运算、浮点运算性能的评分。此次测试使用GCC4.7对nbench进行了编译，选择了最少的优化设置，去掉了不需要的对比。

上边结果可以看出，BBB拥有最强的内存和整数性能，但是浮点性能比不上树莓派，要是应用很少使用浮点运算的话，BBB是非常不错的选择，树莓派的性能比较均衡，包括性能和价格，Intel的伽利略没想到成绩会如此低，ArduinoYun都比伽利略强。