KR:BeagleBone

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BeagleBone

이 페이지는 BeagleBoard.orgTI AM335x ARM을 기반으로 하는 BeagleBone의 정보를 모았다.


이벤트

설명

비글본(BeagleBone)BeagleBoard 제품 라인으로 저렴하며 높은 확장성을 가진다. ARM Cortex-A8 프로세서 코어를 기반으로 TI AM3358/9 SoC를 사용한다. ARMv7-A 구조를 기반으로 한다. 초기 비글보드의 목적과 유사해서 독립적으로 사용하거나 비글보드나 다른 시스템에 이더넷 연결 확장하여 사용할 수 있다. 비글본은 표준 비글보드도 작으면서도 상당한 성능과 용량을 제공한다.

비글본은 4GB 마이크로 SD카드에 Angstrom ARM Linux 배포판과 함께 제공된다.

입력 전력이 가변적이더라도 안정적인 전압을 생성할 수 있도록 TI TPS65217B PMIC를 사용한다. +5V DC는 배럴 커넥터(barrel connector)나 미니-USB를 통해 공급된다. 이 둘은 모두 RJ45 이더넷 커넥터 근처에 위치하고 있다.

mini-USB type-A OTG 장치 클라이언트 모드 소켓은 다양한 기능이 있다. 선택 가능한 전원을 제공하며 온보드 프론트 엔드 2포트 USB 클라이언트 사이드 허브에 접근할 수 있게 한다.(나중에 소개할 독립된 호스트 모드 USB 소켓과는 관련이 없다.) 허브 중 하나는 TI AM3358/9 SoC의 USB0 포트에 직접적으로 연결되지만 다른 포트는 듀얼-포트 FTDI FT2232H USB-to-시리얼 컨버터에 연결되며 이는 보드에서 외부 호스트와 시리얼 통신이나 JTAG 디버깅에 이용된다. 비글본의 리눅스 시리얼 콘솔은 이 USB 시리얼 연결을 통해 가능하다.

프론트 엔드 허브에 SoC의 USB0 연결은 2가지 모드 중에 하나로 동작한다. 언제든 이 2모드 사이에서 토글이 가능하다. 호스트에 마운팅 가능한 USB 저장장치처럼 SD카드나 혹은 Ethernet-over-USB 네트워킹 인터페이스를 제공한다. Ethernet-over-USB 기능은 비글본의 기본 10/100 이더넷 인터페이스에 추가되어 있으며 이는 직접 SoC에 구현되어 있다. 제공한 리눅스 시스템에서 완전한 IPv4와 IPv6 네트워킹을 제공한다.

이미 설명한 USB OTG 장치나 클라이언트 모드 기능 이외에, 비글본은 보드의 다른 가장자리에 호스트 모드 USB type-A 소켓도 제공한다. AM3358/9 SoC에 있는 USB1 연결이며 마우스나 키보드, 저장장치, wifi, 블루투스 동글, USB 허브 등과 같은 USB 호스트 주변장치에 연결을 제공한다.

스펙

  • 최대 720-MHz superscalar ARM Cortex-A8
  • 256-MB DDR2 RAM
  • 10/100 이더넷 RJ45 소켓, IPv4 and IPv6 네트워킹
  • 마이크로SD 슬롯과 4GB 마이크로SD 카드 제공
  • Angstrom ARM 리눅스 배포판
  • 단일 USB 2.0 타입 A 호스트 포트
  • 듀얼 USB 허브 USB 2.0 타입 mini-A OTG 장치 포트
  • On-board USB-to-serial/JTAG 하나의 공유 USB 장치 포트
  • Storage-over-USB or Ethernet-over-USB on other USB device port
  • Extensive I/O: 2 I2C, 5 UART, SPI, CAN, 66 GPIO, 8 PWM, 8 ADC
  • +5V DC power (배럴 커넥터 or USB 장치 포트)
  • 2개 46-pin 3.3-V peripheral headers with multiplexed LCD signals
  • 보드 크기 : 86.4mm x 53.3mm(3.4" × 2.1") -- Altoid tin에 적합

확장 커넥터

비글본은 2개의 46핀 2열 확장 커넥트인 "Expansion A"와 "Expansion B"로 알려진 "P9"와 "P8" 를 제공한다. 이 커넥터의 위치와 핀아웃은 아래에 나와 있다.(크게 볼려면 테이블을 클릭하라). 다른 표시가 없으면 확장 헤더에 모든 신호는 3.3V이다.

P9과 P8 - 각 2x23 pins

P9 Header

BeagleBone P9 + P8 P8 Header


위에 2개의 넓은 허더에 추가로 작은 10-pin 2줄 커넥터는 "P6"과 "PMIC Expansion"를 제공한다. 다음 핀아웃을 이용해서 TPS65217B Power Management IC로부터 추가 신호를 끌어낸다.

P6 - 2x5 pins

P6 MPIC 확장 헤더

중요

P6 다이어그램은 아랫부분 PINOUT을 보여준다.

It is therefore laterally inverted relative to the photograph.

To obtain the top-side pinout that corresponds to the physical orientation shown in the photograph, swap the two rows of pins so that odd-numbered pins are on the left of even-numbered pins.

확장 보드와 악세사리

케이프(Capes)

A BeagleBone Cape is an expansion board which can be plugged into the BeagleBone's two 46-pin dual-row Expansion Headers and which in turns provides similar headers onto which further capes can be stacked. Up to four capes at a time can be stacked on top of a BeagleBone. An expansion board which can be fitted only at the top of a stack of capes (usually for physical reasons) is a special case of "cape", but this usage is common for display expansion boards such as LCDs (see next section).

Capes are required to provide a 32Kbyte I2C-addressed EEPROM which holds board information such as board name, serial number and revision, although this is typically omitted on simple prototyping capes. Capes are also expected to provide a 2-position DIP switch to select their address in the stack, although this too is often omitted in prototyping capes.

The Capes Registry seeks to index all existing capes and cape concepts, including private projects. A registration page is available to help add capes to the list.

This section lists only those capes which are available commercially or which are close to a production release, as well as open hardware designs.

LCD 디스플레이와 확장

비글본에서 LCD 디스플레이는 일반적으로 케이프로 구현되어 있다. 쉽게 볼 수 있도록 하기 위해 케이프의 위에 "탑 보드(top board)" 형태로 연결시킨다.이런 디스플레이는 비글본 보다 더 큰 경우가 많다. 물리적인 관계로 봤을 때 연결된 보드가 본체 보드보다 더 커지는 현상이 생긴다. 비글본을 물리적으로 지원하는 확장 보드이다.

Expanded Hardware Features:
  • 7" 800x480 TFT LCD screen
  • PWM Backlight control
  • Resistive touch panel
  • Plastic frame
  • 256MB Nand flash(K9F2G08)
  • RS232 serial ports(UART1 w/ CTS&RTS)
  • Stereo audio out
  • Micro-phone in
  • 6 x USER buttons
  • PWM Beeper
  • RTC with Battery(DS1302)
3.5" TFT LCD 화면, 해상도 320x240, 4-wire resistive 터치 스크린, 손가락 위치에 잘 맞는 7개 버튼.
7" TFT LCD 화면, 해상도 800x480, 4-wire resistive 터치 스크린, 비글본과 케이프에 rear mount

케이스

BeagleBone Operating Systems

BeagleBone's default operating system is Angstrom, which ships with the board. This section provides basic information on Angstrom and other operating systems commonly used on BeagleBone. This information may help in making a preliminary choice, but full details should be obtained from the home sites.

Angstrom

Ångström was started by a small group of people who worked on the OpenEmbedded, OpenZaurus and OpenSimpad projects to unify their effort to make a stable and user-friendly distribution for embedded devices like handhelds, set top boxes and network-attached storage devices. Ångström can scale down to devices with only 4MB of flash storage.

The Angstrom community does not provide a forum, intentionally.

Angstrom uses Busybox for many key utilities, which has both pros and cons. Advantages include requiring less storage space and a smaller memory footprint for many common utilities, which also improves system startup time and performance. The main disadvantages stem from those utilities not mirroring exactly their full-size counterparts. These differences can be annoying if one is used to standard behavior, and may also break shell scripts that rely on portable functionality.

Angstrom uses connman for network connection management, but no documentation is available for this currently. Also, man(1) and man pages are not provided by default, nor debugging utilities like strace(1) and tcpdump(1). Getting started may therefore present difficulties, depending on experience.

Debian

The ARM EABI port is the default port of the standard Debian distribution of Linux for the ARM architecture ("armel"). EABI ("Embedded ABI") is actually a family of ABIs, and one of the "subABIs" is the GNU EABI for Linux which is used for this port. A newer port targeted at newer hardware with another ABI ("armhf") is currently under development and is expected to ship with Debian 7.0 (Wheezy).

The Debian Project is strongly committed to software freedom, and has a long pedigree and a good reputation.

Ubuntu

Ubuntu의 목표는 소셜과 경제성이다: 무료 소프트웨어로서 모든 사람이 무료로 사용할 수 있으며 Canonical이 제공하는 서비스의 포트폴리오를 통해 펀드를 받는다.

Ubuntu의 첫번째 버전은 GNOME 데스크탑을 기반으로 했지만 KED, Kubuntu와 server버전이 추가되었다. 우분투의 모든 에디션은 공통 인프라구조와 소프트웨어를 공유하고 있다. 특별한 부분은 넷북, 모바일 컴퓨팅, 데이터 센터용으로 새로운 구조를 가지는 클라우드 버전이다.

Fedora

The Fedora Project is sponsored by Red Hat, which invests in its infrastructure and resources to encourage collaboration and incubate innovative new technologies. Some of these technologies may later be integrated into Red Hat products. They are developed in Fedora and produced under a free and open source license from inception, so other free software communities and projects are free to study, adopt, and modify them.

Red Hat has been a major player since the earliest days of Linux distributions, and has earned a good reputation for solidity which continues in Fedora. The Fedora ARM initiative is very active (see mailing list).

ArchLinux

Arch Linux for BeagleBone is a version of the Arch Linux ARM distribution. This carries forward the Arch Linux philosophy of simplicity and user-centrism, targeting and accommodating competent Linux users by giving them complete control and responsibility over the system. Instructions are provided to assist in navigating the nuances of installation on the varied ARM platforms; however, the system itself will offer little assistance to the user.

The entire distribution is on a rolling-release cycle that can be updated daily through small packages instead of huge updates on a defined release schedule. Most packages are unmodified from what the upstream developer originally released.

Gentoo

Gentoo is a source-based meta-distribution of Linux. Instead of distributing a standard system image built with predefined options, Gentoo gives each user the means to create their own customized system that doesn't contain unused bloat and with minimum dependencies. Upgrades are incremental and under user control, so a Gentoo system is normally always up-to-date and wholesale upgrades are avoided.

Being a source-based system, the downside of Gentoo for low-power ARM systems is very long install times for large applications. Cross-compilation on x86 machines and distcc can overcome this problem, but they add complexity.

Sabayon

Sabayon Linux uses the mechanisms of Gentoo to create a pre-configured Linux distribution that can be installed as rapidly as a normal binary distribution, but still retains the benefits of Gentoo's source-based package management. Sabayon on Intel/AMD also provides the Entropy binary package management system, which could in principle greatly ease installation of packages on resource-constrained embedded Linux devices, but this is not yet available for ARM.

Although it is still early days for Sabayon on ARM (and hence on BeagleBone), there is regular progress reported on lxnay's blog, and contributions from the community would probably accelerate the work.

Buildroot

Buildroot is a set of Makefiles and patches that makes it easy to generate a complete embedded Linux system. Buildroot can generate any or all of a cross-compilation toolchain, a root filesystem, a kernel image and a bootloader image. Buildroot is useful mainly for people working with small or embedded systems, using various CPU architectures (x86, ARM, MIPS, PowerPC, etc.) : it automates the building process of your embedded system and eases the cross-compilation process.

The resulting root filesystem is mounted read-only, but other filesystems can be mounted read/write for persistence. Although user accounts can be created, in practice almost everything is done as root. Buildroot uses no package manager. Instead, package selection is managed through make menuconfig.

Nerves Erlang/OTP

Erlang is a programming language used to build massively scalable soft realtime systems with high availability requirements (5-9’s). Some of its uses are in telecoms, banking, e-commerce, computer telephony and instant messaging. Erlang’s runtime system has built-in support for concurrency, distribution and fault tolerance.

OTP is a set of Erlang libraries and design principles providing middle-ware to develop these systems. It includes its own distributed database, applications to interface towards other languages, debugging and release handling tools.

The Nerves project provides an embedded Linux-based environment for running Erlang and an easy-to-use API to access common I/O interfaces, based on Buildroot (see above). If you are interested in running an Erlang node on a low power ARM-based board such as BeagleBone, this project can get you started.

Board recovery

Software Development

Software development on the BeagleBone is normally no different to any other Linux platform, and typically varies with language and with the IDE used, if any. This section deals only with development issues that are specific to BeagleBone, or mostly so.

Cloud9 IDE and Bonescript

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BeagleBone JTAG Debugging

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FAQ

For BeagleBoard frequently asked questions (FAQ) see community FAQ and "official" BeagleBoard.org FAQ.

Links

Home page and Community

Tutorials and Videos

Manuals and resources

Errata

Subpages

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