getting started with beaglebone black - embedded linux

Team Emertxe

Beagle Bone BlackOverview

Contents

Beagle Bone BlackContents

● Target Overview

● Booting Sequence

● Peripheral Interfaces

Target Overview

Beagle Bone BlackTarget Overview

● Know your Target Controller

● Target Architecture

● Target Board

Beagle Bone BlackTarget Overview - Target Controller

Beagle Bone BlackTarget Overview - Target Architecture

AM3359

DDR3L

EEPROM

HDMI

DBGU

USB

GPIO

Ethernet

Micro SD

eMMC

UserLEDs

Beagle Bone BlackTarget Overview - Board

Booting Sequences

Beagle Bone BlackBooting Sequence

● Controller's Booting Sequence

● Boot Loader Stages

Beagle Bone BlackBooting Sequence - Controller's Boot Sequence

● The AM338X controller has many booting options

● The SYSBOOT pins configuration decide the booting sequence

● The ROM Code creates the booting device list based on the the SYSBOOT pins

● The Booting sequence is discussed in the next slide

Beagle Bone BlackBooting Sequence - Controller's Boot Sequence

System Startup

Initialization

__main()(stack setup)

main()

MPU WDT1 Setup

DPLL and ClockConfigurations

Booting

Beagle Bone BlackBooting Sequence - Controller's Boot Sequence

Booting

Set the booting device list based onthe SW Booting Configuration or

SYSBOOT pins

MemoryBooting

PeripheralBooting

Process Device List

Last device in thelist

Process next device

Device is of memory type Device is of peripheral type

Jump to Initial SW

Get next device in the listNo

No more devices in the list

Yes

DeadLoop

FailFailTimeout

success success

Beagle Bone BlackBooting Sequence – BBB Boot Device List

● On SW2 release

– MMC1 (on board eMMC)

– MMC0 (micro SD Card)

– UART0

– USB0● On SW2 pressed

– SPI0 (SPI EEPROM)

– MMC0 (micro SD Card)

– UART0

– USB0

● Stage 1 Boot Loader

● Stage 2 Boot Loader

Beagle Bone BlackBooting Sequence – Boot Loader Stages

● Pointer to Stage 2 Boot Loader

Beagle Bone BlackBooting Sequence – Stage 1 Boot Loader

ROM(ROM Code)

SRAMStage 2

Boot Loader

Kernel

Data

MMC/eMMC

Stage 1Boot Loader

● Pointer to Kernel Image

● We use U-Boot as S2BL

Beagle Bone BlackBooting Sequence – Stage 2 Boot Loader

Stage 2Boot Loader

Kernel

Data

MMC/eMMC

Stage 1Boot Loader

Thank You