BeagleBoardBeginners

This is the "community" beginners guide for TI's ARM based OMAP3 Beagle Board. For "official" beginners guide see My Beagle Board Out of the box experience. If something doesn't work or isn't covered in these guides, please feel free to ask at IRC or mailing list. But before you ask there, make sure you read the FAQs.

So I got this little board, what do I do now?

=Checking everything is working=

First of all you might want to check it for possible defects. To do so, connect a 5-pin Mini-USB cable to the board and to a computer at the other end. If everything's all right you should see one LED light up and, after a short while, two more LEDs coming up too. Also, if you connect some speakers or headphones to the audio output you should hear a burst noise when starting the board.

=Serial connection=

Connect a serial (COM port) cable (known as the AT/Everex Cable) to the 10-pin header on the board: it's next to the power input. Actually, pin number 10 is not used on either end of the cable, so if you have an AT/Everex Cable with a plug in the hole for Pin 10, you can use needle-nose pliers to break off pin 10 on the Beagle Board. Or you could drill out the plug. I used a hot needle for this purpose and it worked. The advantage to breaking off the pin on the BeagleBoard is that now your cable is keyed, and can't be plugged in backwards.

Now you need a Null-Modem DB9 male-male serial cable (that you can also buy from Digikey).

=First interaction with the board=

Connect the serial cable to the COM port in the beagleboard, and connect the other end to the COM port in the computer. Run minicom setup as root:

You'll get a screen as follows: +-[configuration]--+ | Filenames and paths     | | File transfer protocols | | Serial port setup       | | Modem and dialing       | | Screen and keyboard     | | Save setup as dfl       | | Save setup as.. |                                                   | Exit                     | | Exit from Minicom       | +--+
 * 1) minicom -s

Select Serial port setup:

+---+      | A -    Serial Device      : /dev/ttyS1                                | | B - Lockfile Location    : /var/lock                                 | | C -  Callin Program      :                                           | | D - Callout Program      :                                           | | E -   Bps/Par/Bits       : 9600 8N1                                  | | F - Hardware Flow Control : Yes                                      | | G - Software Flow Control : No                                       | |                                                                      |       |    Change which setting? |      +---+               | Screen and keyboard      | | Save setup as dfl       | | Save setup as.. |                                                   | Exit                     | | Exit from Minicom       | +--+

Now press E to change those settings:

+---[Comm Parameters]+ +---|                                       |--+       | A -    Serial | Current: 115200 8N1                    |              | | B - Lockfile L|                                       |              | | C -  Callin P|   Speed          Parity          Data  |              | | D - Callout P|                                        |              | | E -   Bps/Par| A: 300           L: None         S: 5  |              | | F - Hardware F| B: 1200         M: Even         T: 6  |              | | G - Software F| C: 2400         N: Odd          U: 7  |              | |              | D: 4800          O: Mark         V: 8  |              | |   Change whic| E: 9600          P: Space              |              | +---| F: 19200                     Stopbits |--+ | Screen| G: 38400                        W: 1  | | Save s| H: 57600                        X: 2  | | Save s| I: 115200       Q: 8-N-1              | | Exit | J: 230400        R: 7-E-1              | | Exit f|                                       | +---|                                       |                                      | Choice, or  to exit? |                                     ++

You should get 115200 8N1, press keys I, L, V and W. When you're done, press Enter.

Now in the previous screen, press F to set Hardware Flow Control to Off. You should have this now:

+---+      | A -    Serial Device      : /dev/ttyS1                                | | B - Lockfile Location    : /var/lock                                 | | C -  Callin Program      :                                           | | D - Callout Program      :                                           | | E -   Bps/Par/Bits       : 115200 8N1                                | | F - Hardware Flow Control : No                                       | | G - Software Flow Control : No                                       | |                                                                      |       |    Change which setting? |      +---+               | Screen and keyboard      | | Save setup as dfl       | | Save setup as.. |                                                   | Exit                     | | Exit from Minicom       | +--+                                       Press Enter to leave this screen and select Exit from Minicom next.

Now run minicom as root:


 * 1) minicom

You should get the following screen:

Welcome to minicom 2.2 OPTIONS: Compiled on Sep 8 2008, 17:03:34. Port /dev/ttyS0 Press CTRL-A Z for help on special keys Texas Instruments X-Loader 1.41 Starting OS Bootloader...                                                    U-Boot 1.3.3 (Jul 10 2008 - 16:33:09) OMAP3530-GP rev 2, CPU-OPP2 L3-165MHz OMAP3 Beagle Board + LPDDR/NAND DRAM: 128 MB                            NAND:  256 MiB In:   serial Out:  serial Err:  serial Audio Tone on Speakers ... complete OMAP3 beagleboard.org #

If you don't, check the serial port. You'll have to go back to the config (minicom -s) and get to this screen:

+---+      | A -    Serial Device      : /dev/ttyS1                                | | B - Lockfile Location    : /var/lock                                 | | C -  Callin Program      :                                           | | D - Callout Program      :                                           | | E -   Bps/Par/Bits       : 9600 8N1                                  | | F - Hardware Flow Control : Yes                                      | | G - Software Flow Control : No                                       | |                                                                      |       |    Change which setting? |      +---+               | Screen and keyboard      | | Save setup as dfl       | | Save setup as.. |                                                   | Exit                     | | Exit from Minicom       | +--+

Now press A and change /dev/ttyS1 for /dev/ttyS0, or 2 or 3, depending on which port you have it connected. In my case it was 0.

Now we got the beagleboard shell! Congratulations!

First command we wanna try is "help":

OMAP3 beagleboard.org # help

If you get some output, you're happy!

=SD card setup=

Now we want to use an SD card to install some GNU/Linux distro in it and get more space for our stuff. You should know that you are not dealing with an x86 processor, this is a completely different architecture called ARM, so don't even try to install a normal distro here.

Since the steps for getting this to work are already written down in the wikis, I'll copy the information, pointing out some extra things you should take care of.

First of all, we want to set up the SD card to be used as a boot disk, let's plug it into our PC card reader and see what the wiki page says:

MMC boot format

In order to create a bootable SD/MMC card under Linux compatible with OMAP3 boot ROM, you have to set a special geometry in the partition table, which is done through the fdisk "Expert mode".

First, lets clear the partition table:

================================================================================ Command (m for help): o Building a new DOS disklabel. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won't be recoverable. Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite) ================================================================================
 * 1) fdisk /dev/sdb

Print card info:

================================================================================ Command (m for help): p Disk /dev/sdb: 128 MB, 128450560 bytes .... ================================================================================

Note card size in bytes. Needed later below.

Then go into "Expert mode":

================================================================================ Command (m for help): x ================================================================================

Now we want to set the geometry to 255 heads, 63 sectors and calculate the number of cylinders required for the particular SD/MMC card:

================================================================================ Expert command (m for help): h Number of heads (1-256, default 4): 255 Expert command (m for help): s Number of sectors (1-63, default 62): 63 Warning: setting sector offset for DOS compatiblity ================================================================================

NOTE: Be especially careful in the next step. First calculate the number of cylinders as follows:


 * B = Card size in bytes (you got it before, in the second step when you printed the info out)
 * C = Number of cylinders

C=B/255/63/512

When you get the number, you round it DOWN. Thus, if you got 108.8 you'll be using 108 cylinders.

================================================================================ Expert command (m for help): c Number of cylinders (1-1048576, default 1011): 15 ================================================================================

In this case 128MB card is used (reported as 128450560 bytes by fdisk above), thus 128450560 / 255 / 63 / 512 = 15.6 rounded down to 15 cylinders. Numbers there are 255 heads, 63 sectors, 512 bytes per sector.

So far so good, now we wanna create two partitions. One for the boot image, one for our distro. Let's check what another wiki page has to say about it:

Linux boot disk format

Create the FAT32 partition for booting and transferring files from Windows. Mark it as bootable.

================================================================================ Command (m for help): [n] Command action e  extended p  primary partition (1-4) [p] Partition number (1-4): [1] First cylinder (1-245, default 1): [(press Enter)] Using default value 1 Last cylinder or +size or +sizeM or +sizeK (1-245, default 245): [+50] Command (m for help): [t] Selected partition 1 Hex code (type L to list codes): [c] Changed system type of partition 1 to c (W95 FAT32 (LBA)) Command (m for help): [a] Partition number (1-4): [1] ================================================================================

Create the Linux partition for the root file system.

================================================================================ Command (m for help): [n] Command action e  extended p  primary partition (1-4) [p] Partition number (1-4): [2] First cylinder (52-245, default 52): [(press Enter)] Using default value 52 Last cylinder or +size or +sizeM or +sizeK (52-245, default 245):[(press Enter)] Using default value 245 ================================================================================

Print and save the new partition records.

================================================================================ Command (m for help): [p] Disk /dev/sdc: 2021 MB, 2021654528 bytes 255 heads, 63 sectors/track, 245 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot     Start         End      Blocks   Id  System /dev/sdc1  *           1          51      409626    c  W95 FAT32 (LBA) /dev/sdc2             52         245     1558305   83  Linux Command (m for help): [w] The partition table has been altered! Calling ioctl to re-read partition table. WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot. WARNING: If you have created or modified any DOS 6.x partitions, please see the fdisk manual page for additional information. Syncing disks. ================================================================================

Now we got both partitions, next step is formatting them.

================================================================================ mkfs.msdos 2.11 (12 Mar 2005) mke2fs 1.40-WIP (14-Nov-2006) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) 195072 inodes, 389576 blocks 19478 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=402653184 12 block groups 32768 blocks per group, 32768 fragments per group 16256 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912 Writing inode tables: done Creating journal (8192 blocks): done Writing superblocks and filesystem accounting information: ================================================================================
 * 1) mkfs.msdos -F 32 /dev/sdc1 -n LABEL
 * 1) mkfs.ext3 /dev/sdc2

All done!

=Writing the Ångström image into the SDcard and finally booting GNU/Linux=

Now we have these two partitions. In the first one we're going to write the Linux boot image and other stuff, while in the other one we're going to write our Ångström root filesystem.

First of all, let's download the files we're going to need from:

Ångström demo images

Get the latest Ångström demo image (Angstrom-Beagleboard-demo-image......), MLO, u-boot.bin and uImage.

Now you must copy MLO, u-boot.bin and uImage into the first partition (the FAT32 one) of your SD card. Do it in this strict order, since MLO must be in the first sectors of the card.

Mount both partitions somewhere -- I'll assume they're mounted in /mnt/sda1 and /mnt/sda2, respectively.


 * 1) cp MLO /mnt/sda1
 * 2) cp u-boot.bin /mnt/sda1
 * 3) cp uImage /mnt/sda1

Now let's copy the root filesystem into the other partition (the ext3 one):


 * 1) cp Angstrom-Beagleboard-demo-image..... /mnt/sda2

and untar it. (IMPORTANT: You must untar directly onto the SD card. Do not untar somewhere else and then copy to the SD):


 * 1) cd /mnt/sda2
 * 2) tar -jxvf Angstrom-Beagleboard-demo-image....

Once that's done, delete the tarball:


 * 1) rm Angstrom-Beagleboard-demo-image....

and unmount both partitions.


 * 1) umount /mnt/sda1
 * 2) umount /mnt/sda2

Ok, we're almost done. Now we need to tell our BeagleBoard that we want it to boot from the SD card. Let's go back to our almost-forgotten minicom shell:

OMAP3 beagleboard.org # The commands to set it up for booting from SD are:


 * 1) setenv bootargs 'console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw rootwait'
 * 2) setenv bootcmd 'mmcinit;fatload mmc 0 80300000 uImage;bootm 80300000'

Now we want to save these variables into the NAND Flash so we don't have to type them in every time we reboot:


 * 1) saveenv

And, YES, we're done.

Connect the BeagleBoard to a screen using a DVI cable and press the RESET button while holding down the USER button. Now you've got to be PATIENT, first boot takes a looooong time.

=Development with Ångström=

If you want to get started building Ångström yourself, take a look at OpenEmbedded on Beagle.

=Important=

The BeagleBoard has a 5-pin USB OTG Mini-AB Female connector on the board. This allows the Beagle to operate as either a peripheral attached to a host computer (e.g. a PC) or as a host computer itself with peripherals attached.

To operate the Beagle as a peripheral, just use any USB A-male to Mini-B-male cable and you're good to go. Plus, you will not need a power brick for the Beagle as the Host PC will be able to power the board through the A to Mini-B cable.

To operate the Beagle as an OTG Host, you need a special cable -- plus you will need a power brick to power the Beagle, because it is now the host and must supply power to the peripherals. The key is that the cable needs to have a USB Mini-A-male (NOT a Mini-B) to connect to the Beagle. There are two sources for a USB Standard A-female to Mini-A-male Adapter: Vernier and Serial I/O. One of these will be required in order to connect a USB hub to the Beagle.

If you're using a USB hub, be sure it's a self-powered one. That means it should have a power input which you can connect to a power socket. The BeagleBoard by itself cannot power multiple USB devices and if you hook up too many it goes into a continuous disconnect/reconnect cycle.

=Thanks to=


 * _vlad
 * jkridner
 * ds2

And the rest of the people in the #beagle IRC channel, if you cannot go through some of the steps, don't hesitate to ask there, there's always somebody willing to help you!

Written by Nabax