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#BeagleBone Black playground

Document links

BeagleBone Black System Reference Manual AM335x Technical Reference Manual

Loading secondary program via usb

Connect the micro usb cable to your BBB while S2 pressed down. Now ROM code on AM335x will try to load next stage from serial or over usb/rndis/bootp+tftp combination until it succeeds in one. After connecting usb with S2 pressed down, consecutive resets via reset button (S1) will trigger same way of booting for ROM code.

Text below tries to descibe how to work with usb/bootp+ftfp way of booting.

Easiest is to use a Linux computer with Dnsmasq. If you have an apt powered system you may find working with instructions below easier.

Setting up Dnsmasq

Install dnsmasq. e.g.

sudo apt-get install dnsmasq

Append the configuration below

#disable DNS
port=0
interface=usb0
dhcp-range=192.168.0.50,192.168.0.150,12h
bootp-dynamic
enable-tftp
tftp-root=/tmp/tftp
dhcp-boot=beagle.img

Restart dnsmasq

sudo /etc/init.d/dnsmasq restart

Resetting/plugging with S2 down, BBB should produce some logs by dnsmasq under syslog.

$ sudo cat /var/log/syslog|grep dnsmasq
dnsmasq-dhcp[1620]: DHCP packet received on usb0 which has no address
dnsmasq-dhcp[1620]: BOOTP(usb0) 192.168.0.115 c8:a0:30:ae:2a:0a 
dnsmasq-tftp[1620]: sent /tmp/tftp/beagle.img to 192.168.0.115

On serial you may see C characters (xmodem).

##Examples ####bbb_baremetal_led Simplest code to turn on led USR0. Suitable for peripheral booting - it doesn't use u-boot.