Difference between revisions of "BeagleBoard Zippy2"

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(Where to purchase the Zippy2 (KSZ8851SNL-BBE-EVAL))
 
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[[Category: Linux]]
+
 
[[Category: Expansion Boards]]
 
[[Category:Development Boards]]
 
[[Category: Zippy2 (KSZ8851SNL-BBE-EVAL)]]
 
  
 
[[File:zippy2-base.jpg|400px]]
 
[[File:zippy2-base.jpg|400px]]
  
The Zippy2 Ethernet Combo Board (KSZ8851SNL-BBE-EVAL) is a low cost expansion board for the BeagleBoard that provides the following peripherals:
+
The Zippy2 Ethernet Combo Board (KSZ8851SNL-BBE-EVAL) is a low cost expansion board for the [[BeagleBoard]] that provides the following peripherals:
 
* 10/100BaseT Ethernet
 
* 10/100BaseT Ethernet
 
* Second SD/MMC Interface
 
* Second SD/MMC Interface
Line 13: Line 10:
 
* I2C Interface (+5V level)
 
* I2C Interface (+5V level)
 
* AT24C01 Serial EEPROM for Board Identification
 
* AT24C01 Serial EEPROM for Board Identification
 +
 +
 +
The Zippy2 (KSZ8851SNL-BBE-EVAL) board was jointly developed by [http://www.micrel.com Micrel] and [[TinCanTools]] ([http://www.tincantools.com Company Website]) and is available [http://www.tincantools.com/product.php?productid=16148&cat=255&page=1 here].
 +
.
 +
  
  
Line 25: Line 27:
 
== RS232 Serial Interface ==
 
== RS232 Serial Interface ==
  
The Zippy2 provides a second RS-232 serial port for the BeagleBoard. There are two serial connectors provided. Either connector is available for use: 1) standard DB9 Male connector, or 2) 2x5 shrouded header (0.1 inch pin spacing).
+
The Zippy2 provides a second RS-232 serial port for the BeagleBoard:
 +
There are two serial connectors provided.  
 +
* Standard DB9 Male connector
 +
* 2x5 shrouded header (0.1 inch pin spacing).
  
 
== Real-time Clock ==
 
== Real-time Clock ==
Line 70: Line 75:
  
 
== Serial EEPROM ==
 
== Serial EEPROM ==
The Zippy2 provides a AT24C01 serial EEPROM that contains a Vendor ID and a Device ID that the BeagleBoard uses to identify the type of board connected to the expansion header.  This information enables the BeagleBoard to auto-configure the pin mux for signals needed by the Zippy2.  More information can be found [http://elinux.org/BeagleBoardPinMux#Expansion_boards here].
+
The Zippy2 provides an AT24C01 serial EEPROM that contains a Vendor ID and a Device ID that the BeagleBoard uses to identify the type of board connected to the expansion header.  This information enables the BeagleBoard to auto-configure the pin mux for signals needed by the Zippy2.  More information can be found on the [[BeagleBoardPinMux|Beagle Board Pin Mux Page]].
  
 
= Soldering BeagleBoard's Expansion Header =
 
= Soldering BeagleBoard's Expansion Header =
Line 94: Line 99:
 
[[File:zippy2-expansion_connector7.jpg|400px]]
 
[[File:zippy2-expansion_connector7.jpg|400px]]
  
Attach the four board spacers with the screws provides.
+
Attach the four board spacers with the screws provided.
  
  
Line 119: Line 124:
 
= Creating a bootable SD card in Ubuntu =
 
= Creating a bootable SD card in Ubuntu =
  
This guide shows how to partition and format a SD card correctly for the BeagleBoard. This Guide covers the same procedure: [http://elinux.org/BeagleBoardBeginners#SD_card_setup BeagleBoardBeginners SDCard setup]
+
This guide will demonstate how to create a '''dual-partition''' SD card for the BeagleBoard/Zippy2 combination to boot Linux from the first partition and have the root file system located on the second partition.
  
== Partition the SD card ==
+
This guide covers the same procedure as [[BeagleBoardBeginners|SDCard setup]] and [http://code.google.com/p/beagleboard/wiki/LinuxBootDiskFormat LinuxBootDiskFormat].
The card has to have a special geometry (heads/cylinders) to work correctly. The setup is fast and easy:
 
# If mounted, the card will be unmounted (mounted drives can't be partitioned)
 
# The old partitions are deleted
 
# Two new partitions are created
 
# The two new partitions are formatted
 
  
== Connect the card to the Linux PC==
+
This guide will use a '''2GB SD card''' for all examples.
  
Check where linux mounted the card. One way is to check this via mount. If automatic mounting is not enabled, you can use dmesg to check which name is used for the card.
+
'''Determine which device the SD Card Reader is on your system'''
  
Call mount to see where the card has been mounted. A name like '/media/disk' is likely for a factory new card. Note the device name, e.g. '/dev/sdb'.
+
Insert the SD Card into the SD Card Reader reader on your Linux PC. Then determine which device it is on your system:
  
mount
+
dmesg | tail
 +
...
 +
[2079456.496092] sd 34:0:0:0: [sdb] Mode Sense: 03 00 00 00
 +
[2079456.496096] sd 34:0:0:0: [sdb] Assuming drive cache: write through
 +
[2079456.513743] sd 34:0:0:0: [sdb] Assuming drive cache: write through
 +
[2079456.513751]  sdb: sdb1
 +
[2079456.529193] sd 34:0:0:0: [sdb] Assuming drive cache: write through
 +
[2079456.529201] sd 34:0:0:0: [sdb] Attached SCSI removable disk
  
If the check with mount didn't work out, use dmesg:
+
In this case it shows up as /dev/sdb (note sdb insite the square brackets above).
  
dmesg | tail
+
'''Check to see if the automounter has mounted the SD Card:'''
  
Watch out for a line like this:
+
df -h
 +
Filesystem            Size  Used Avail Use% Mounted on
 +
...                  1.8G    0  1.8G  0% /lib/init/rw
 +
/dev/sdb1            1.9G    0  1.9G  0% /media/6262-9331
 +
...
  
[sdb] Attached SCSI removable disk
+
'''If mounted, unmount the SD card'''
  
Where sdb could also be sdc or sdd. If it was sdb, the device name of the memory card is /dev/sdb.
+
umount /media/6262-9331
Unmount the card
 
  
The card will be mounted in /media, something like /dev/disk. Now unmount the disk:
+
'''Start fdisk:'''
  
sudo umount /media/disk
+
sudo fdisk /dev/sdb
 +
'''Print the partition record:'''
 +
<pre>
 +
  Command (m for help): p
  
or: unmount manually in the file browser
+
  Disk /dev/sdb: 1967 MB, 1967128576 bytes
Start FDISK
+
  57 heads, 56 sectors/track, 1203 cylinders
 +
  Units = cylinders of 3192 * 512 = 1634304 bytes
 +
  Disk identifier: 0x00000000
  
Now start fdisk to check the partition table of the SD card.
+
  Device Boot      Start        End      Blocks  Id  System
Start fdisk without partition number. So use '/dev/sda' or '/dev/sdb' and not /dev/sdb1'.
+
  /dev/sdb1            1        1204    1920955+  6  FAT16
 +
</pre>
 +
Note card size in bytes listed above (in this example: '''1967128576'''). '''Write this number down, it will be needed later below'''.
  
sudo fdisk /dev/sdb
+
'''Delete any partitions that are already on the SD card'''
  
Adjust the Geometry of the Card
+
  Command (m for help): ''d''
 +
  Selected partition 1
  
Print the current partition table:
+
'''Set the Geometry of the SD Card'''
  
Command (m for help): PEnter
+
Go into "Expert mode":
  
Disk /dev/sdb: 7948 MB, 7948206080 bytes
+
  Command (m for help): ''x''
81 heads, 10 sectors/track, 19165 cylinders
 
Units = cylinders of 810 * 512 = 414720 bytes
 
Disk identifier: 0x00000000
 
 
  Device Boot      Start        End      Blocks  Id  System
 
/dev/sdb1              11      19166    7757824    b  W95 FAT32
 
  
Remember the top right number: 7948206080 bytes. It of course depends on the size of the SD card. You will need it later to calculate the new number of cylinders.
+
Now we want to set the geometry to 255 heads, 63 sectors and calculate the number of cylinders required for the particular SD card you are using:
 +
<pre>
 +
  Expert command (m for help): h
 +
  Number of heads (1-256, default 57): 255
  
Delete this partition:
+
  Expert command (m for help): s
 +
  Number of sectors (1-63, default 56): 63
 +
  Warning: setting sector offset for DOS compatiblity
  
Command (m for help): DEnter
+
  Expert command (m for help): c
 +
  Number of cylinders (1-1048576, default 1203): 239
 +
</pre>
 +
The '''239''' entered in the cylinders above must be calculated based upon the size of your particular SD card.
  
Selected partition 1
+
'''Now Calculate the number of Cylinders for your SD card:'''
  
Go into Expert mode:
+
'''''number of cylinders = FLOOR (the number of Bytes on the SD Card (from above) / 255 heads / 63 sectors / 512 sector size in bytes )'''''
  
Command (m for help): XEnter
+
So for this example:  1967128576 / 255 / 63 / 512 = 239.156427  (use Google to calculate).  So we use 239 (i.e. truncate, don't round).
 +
 +
Return to "Normal" mode:
  
Selected partition 1
+
Expert command (m for help): ''r''
  
Set the number of heads to 255
 
  
Expert command (m for help): HEnter
+
'''Print the partition record to check your work:'''
 +
<pre>
 +
Command (m for help): p
  
Number of heads (1-256, default 81): 255Enter
+
Disk /dev/sdb: 1967 MB, 1967128576 bytes
 +
255 heads, 63 sectors/track, 239 cylinders
 +
Units = cylinders of 16065 * 512 = 8225280 bytes
  
Set the number of sectors to 63
+
  Device Boot      Start        End      Blocks  Id  System
  
Expert command (m for help): SEnter
+
</pre>
  
Number of sectors (1-63, default 10): 63Enter
+
'''Create the FAT32 partition for booting and transferring files from your PC'''
 +
<pre>
 +
Command (m for help): n
 +
Command action
 +
    e  extended
 +
    p  primary partition (1-4)
 +
p
 +
Partition number (1-4): 1
 +
First cylinder (1-15, default 1): 1
 +
Last cylinder or +size or +sizeM or +sizeK (1-239, default 239): 50
  
This warning is normal and fine:
+
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))
 +
</pre>
 +
We use 50 cylinders of the total of 239 for the FAT32 partition above.  The remainder of the cylinders will be used for the Linux root file system below.
  
Warning: setting sector offset for DOS compatiblity
+
'''Mark this FAT32 partition as bootable:'''
  
Now the number of cylinders has to be adjusted to match the size of your SDHC card:
+
Command (m for help): a
 +
Partition number (1-4): 1
  
cylinders = floor(bytes of the SDHC card (see the note above) / heads / sectors / sector size (512))
+
'''Create the Linux partition for the root file system'''
 +
<pre>
 +
Command (m for help): n
 +
Command action
 +
    e  extended
 +
    p  primary partition (1-4)
 +
''p''
 +
Partition number (1-4): 2
 +
First cylinder (51-239, default 51): 51
 +
Last cylinder or +size or +sizeM or +sizeK (51-239, default 239): 239
 +
</pre>
 +
 +
'''Print the partition record to check your work'''
 +
<pre>
 +
Command (m for help): p
  
So for our 8GB microSDHC card, this is then (use Google to calculate):
+
Disk /dev/sdb: 1967 MB, 1967128576 bytes
 +
255 heads, 63 sectors/track, 239 cylinders
 +
Units = cylinders of 16065 * 512 = 8225280 bytes
  
7948206080 / 255 / 63 / 512 = 966.314348
 
  
So we cut off the decimal digits (not rounding) and use 966 for this example.
+
  Device Boot      Start        End      Blocks  Id  System
 +
/dev/sdb1              1        50    1920955+  c  w95 FAT32 (LBA)
 +
/dev/sdb2              51        239              83 Linux
 +
</pre>
 +
'''Save the new partition records on the SD card'''
  
Expert command (m for help): CEnter
+
This is an important step. All work up to now has been temporary.
 
+
<pre>
The number 966 is of course only valid for our 8GB SDHC card. Use your calculated number here!
+
  Command (m for help): w
 
+
  The partition table has been altered!
Number of cylinders (1-1048576, default 19165): 966Enter
+
 
+
  Calling ioctl() to re-read partition table.
Return to normal mode:
 
 
 
Expert command (m for help): REnter
 
 
 
Check the result:
 
 
 
Command (m for help): PEnter
 
 
 
Disk /dev/sdb: 7948 MB, 7948206080 bytes
 
255 heads, 63 sectors/track, 966 cylinders
 
Units = cylinders of 16065 * 512 = 8225280 bytes
 
Disk identifier: 0x00000000
 
 
   
 
   
  Device Boot      Start        End      Blocks   Id  System
+
   WARNING: If you have created or modified any DOS 6.x
 +
  partitions, please see the fdisk manual page for additional
 +
  information.
 +
  Syncing disks.
 +
</pre>
 +
'''Format the partitions'''
 +
<pre>
 +
  sudo mkfs.msdos -F 32 /dev/sdb1 -n boot
 +
  mkfs.msdos 3.0.3 (18 May 2009)
  
Create the boot partition
+
  sudo mkfs.ext3 -L rootfs /dev/sdb2
 +
  mke2fs 1.41.9 (22-Aug-2009)
 +
  Filesystem label=rootfs
 +
  OS type: Linuxsudo mkfs.ext3 -L rootfs /dev/sdb2
 +
  mke2fs 1.41.9 (22-Aug-2009)
 +
  Filesystem label=rootfs
 +
  OS type: Linux
 +
  Block size=4096 (log=2)
 +
  Fragment size=4096 (log=2)
 +
  95040 inodes, 379535 blocks
 +
  18976 blocks (5.00%) reserved for the super user
 +
  First data block=0
 +
  Maximum filesystem blocks=390070272
 +
  12 block groups
 +
  32768 blocks per group, 32768 fragments per group
 +
  7920 inodes per group
 +
  Superblock backups stored on blocks:
 +
  32768, 98304, 163840, 229376, 294912
  
Create a new partition (the boot partition):
+
  Writing inode tables: done
 +
  Creating journal (8192 blocks): done
 +
  Writing superblocks and filesystem accounting information: done
 +
</pre>
  
Command (m for help): NEnter
+
==Copy files onto the BOOT partition ==
  
Command action
+
You will need to download the demo/test files for the BeagleBoard/Zippy2 combination:
  e  extended
+
#[[media:MLO-zippy2.ift|MLO]] (save as MLO)
  p  primary partition (1-4)
+
#[[media:u-boot-zippy2.bin|u-boot.bin]] (save as u-boot.bin)
 +
#[[media:uImage-zippy2.bin|uImage]] (save as uImage)
 +
#[[media:test.rootfs2.tar.gz|test.rootfs.tar.gz]] (save as test.rootfs.tar.gz)
  
Create the first primary partition:
 
  
Command (m for help): PEnter
+
And now copy the first three files onto the boot partition ('''IMPORTANT: Copy MLO FIRST!''' because of a bug in the X-loader which causes problems if MLO is not the first file written onto the boot partition).
  
Command action
+
  cp MLO /media/boot/MLO
  e   extended
+
   cp u-boot.bin /media/boot/u-boot.bin
  p   primary partition (1-4)
+
   cp uImage /media/boot/uImage
  
Partition number (1-4): 1Enter
+
==Copy the files onto the Linux partition==
First cylinder (1-966, default 1): Enter
 
  
Using default value 1
+
The next step is to extract the files in '''test-rootfs.tar.gz''' into the rootfs partition (NOT the boot partition) on the SD card. This can only be done by using Linux.
  
Select cylinder 50 as last cylinder
+
  sudo tar -zxvf test-rootfs.tar.gz -C /media/rootfs
  
Last cylinder, +cylinders or +size{K,M,G} (1-966, default 966): +50CEnter
+
Unmount the SD card from the Linux PC and insert it into the BeagleBoard's SD connector.
Create the Linux partition
 
  
Create a new partition (the linux partition):
+
Then boot your BeagleBoard while holding down the "User" button.
  
Command (m for help): NEnter
+
= Automated script to create a bootable SD card =
  
Command action
+
The following script will create a formatted SD card using your Linux PC. 
  e  extended
 
  p  primary partition (1-4)
 
  
Create the first primary partition:
+
*[[media:mksdcard2.sh| mksdcard.sh]]
  
Command (m for help): PEnter
+
Make a working directory for the files: mksdcard.sh, MLO, u-boot.bin, uImage, and test-rootfs.tar.gz and copy them into it.
  
Command action
+
You will also need to make two mount points:
  e  extended
 
  p  primary partition (1-4)
 
  
Partition number (1-4): 2Enter
+
  mkdir /mnt/sdcard1
First cylinder (52-966, default 52): Enter
+
  mkdir /mnt/sdcard2
  
Using default value 52
+
Then from inside the working directory you created above, issue the command like this:
  
Select cylinder 966 as last cylinder (using the default)
+
  ./mksdcard.sh /dev/sdb
  
Last cylinder, +cylinders or +size{K,M,G} (52-966, default 966): Enter
+
Where /dev/sdb is the drive for the SD card.
Final Result
 
  
Check the result, it should now look like this (depending on the SDHC card size):
+
This should generate a fresh bootable SD card for you!
  
Command (m for help): PEnter
+
= Design Documents =
 
+
The following are the design documents for the Zippy2 (KSZ8851SNL-BBE-EVAL) board:
Disk /dev/sdb: 7948 MB, 7948206080 bytes
+
* [[media:zippy2_schematic.pdf|Zippy2_schematic]]
255 heads, 63 sectors/track, 966 cylinders
+
* [[media:zippy2_gerbers.zip|Zippy2_gerbers.zip]]
Units = cylinders of 16065 * 512 = 8225280 bytes
+
* [[media:zippy2_BOM.pdf|Zippy2_BOM.pdf]]
Disk identifier: 0x00000000
 
 
  Device Boot      Start        End      Blocks  Id  System
 
/dev/sdb1              1          51      409626  83  Linux
 
/dev/sdb2              52        966    7349737+  83  Linux
 
 
 
Write the partition table
 
  
The changes you made are not yet written to the hard disk. Write them now. FDISK will exit after the write operation.
+
= Software Links =
  
Command (m for help): WEnter
+
The latest Linux driver for the KSZ8851SNL is included in the mainline Linux kernel and can be downloaded here:
  
The partition table has been altered!
+
http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.32.7.tar.bz2
 
Calling ioctl() to re-read partition table.
 
Syncing disks.
 
  
Finished! The next step is to format the new partitions.
+
Also, Linus' GIT repo can be pulled from here:
Format the Card
 
  
Watch out to use the right harddisk handle (/dev/sdb or /dev/sdc)! You can't format mounted drives (e.g. your currently running Linux) but you might format the wrong card or a spare harddisk. Format the boot partition (labeled in this case 'BOOT', but any other string is legal). It is recommended to use the proposed drive label names as this will make the further use of our tutorials more convenient.
+
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=summary
  
sudo mkfs.msdos -F 32 /dev/sdb1 -n BOOT
+
Or you can view just the driver:
  
Format the Linux partition (labeled 'LINUX')
+
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=drivers/net/ks8851.c;h=6d3ac65bc35cfcd1ae3eb27e6249a8be38efe705;hb=HEAD
  
sudo mkfs.ext3 -L LINUX /dev/sdb2
+
= Programming the Zippy2 =
 +
All of the devices on the Zippy2 work as standard linux devices which means any reference material for these devices is applicable:
  
Copy files onto SDHC card
+
How to access the I2C bus (from software): http://i2c.wiki.kernel.org/index.php/Linux_2.6_I2C_development_FAQ
  
The last step is to copy the Linux system onto a bootable SD/SDHC card. This allows, in contrast to the onboard NAND flash, to include a wide range of software packets and data, having several gigabytes.
+
How to access the second UART: http://tldp.org/HOWTO/Serial-HOWTO.html
 +
and http://www.vanemery.com/Linux/Serial/serial-console.html
  
Unplug and re-plug your card reader in order to auto-mount the two new partitions
+
How to use and configure the Ethernet port: http://tldp.org/HOWTO/Ethernet-HOWTO.html
  
If your card is correctly formatted, then you can now copy the Linux system on it. This is covered in a special guide:
+
How to access the SD card:
 +
If you are using the Angstrom images, then all you have to do is insert the SD card and it will be automatically mounted.  To check just issue the command "mount" at the prompt to view the currently mounted devices.
  
    * Copy Linux filesystem on bootable SD car
 
 
= Automated script =
 
 
= Design Documents =
 
  
 +
To set the real time clock (RTC) on the Zippy2 board:
  
[[File:zippy2-base.jpg|200px]]
+
First: Set the date:
 +
  date -s 2010.02.15-17:52
 +
(date -s YYYY.MM.DD-HH:SS  (the time HH:SS is in 24 hour format)
  
 +
Then write the current date into the RTC's hardware registers:
  
 +
  hwclock -w
  
= Software =
+
As long as you have a good backup battery (the small coin battery),  the RTC should keep the time correct even if you remove power and boot-up the BeagleBoard at a later time.
  
*Demo/Test Files
+
= Where to purchase the Zippy2 (KSZ8851SNL-BBE-EVAL)=
**[[media:MLO-zippy2.ift|MLO]] (save as MLO)
 
**[[media:u-boot-zippy2.bin|u-boot.bin]] (save as u-boot.bin)
 
**[[media:uImage-zippy2.bin|uImage]] (save as uImage)
 
**[[media:defconfig2.txt|Kernel Config]]
 
  
*place these files on your formated SD card per the instuctions at the [http://code.google.com/p/beagleboard/wiki/LinuxBootDiskFormat LinuxBootDiskFormat] page
+
The Zippy2 can be purchased from [http://www.tincantools.com/product.php?productid=16148&cat=255&page=1 TinCanTools.com (USA)] and [http://www.watterott.com/en/Zippy2-Ethernet-Combo-Board watterott.com (Germany)]
*boot your BeagleBoard while holding down the "User" button.
+
[[Category: BeagleBoard]]
 +
[[Category: BeagleBoard Expansion Boards]]
 +
[[Category: TinCanTools]]

Latest revision as of 01:51, 5 June 2013


Zippy2-base.jpg

The Zippy2 Ethernet Combo Board (KSZ8851SNL-BBE-EVAL) is a low cost expansion board for the BeagleBoard that provides the following peripherals:

  • 10/100BaseT Ethernet
  • Second SD/MMC Interface
  • Second RS232 Serial Interface
  • Real-Time clock with Battery Back-up
  • I2C Interface (+5V level)
  • AT24C01 Serial EEPROM for Board Identification


The Zippy2 (KSZ8851SNL-BBE-EVAL) board was jointly developed by Micrel and TinCanTools (Company Website) and is available here. .


Hardware

Ethernet

The Zippy2 provides a standard 10/100BaseT (10/100 Mbit) Ethernet interface and uses Micrel's KSZ8851SNL SPI to Ethernet controller.

SD/MMC Interface

The Zippy2 provides a second SD/MMC interface that supports both 3.3V and 1.8V SD memory cards.

RS232 Serial Interface

The Zippy2 provides a second RS-232 serial port for the BeagleBoard: There are two serial connectors provided.

  • Standard DB9 Male connector
  • 2x5 shrouded header (0.1 inch pin spacing).

Real-time Clock

The Zippy2 provides a battery backed-up Real Time Clock (RTC) which uses the Maxim DS1307. The backup power is provided by a small 3V lithium coin battery and is held in place by a battery holder.

Compatible 3V Lithium Coin Batteries:

  • CR1216
  • CR1220
  • CR1225

Battery cell size = 12mm.

The battery is not included with the Zippy2 and must be purchased separately. Compatible batteries are available from Digi-Key:

Panasonic CR1216

Energizer CR1216


Installing the 3V lithium coin battery:

Zippy2-battery01.jpg

Insert the battery with the positive "+" side up.


Zippy2-battery2.jpg

Slide the battery all the way into the battery holder.

I²C Interface

The Zippy2 provides a 4-pin header expansion connector for access to the BeagleBoard's I²C signals. The signals have been level translated to 5V to allow easy connection to standard 5V peripherals.

I²C expansion header pin assignments:

  • pin 1 - +5V Power
  • pin 2 - SDA (5V signal level)
  • pin 3 - SCL (5V signal level)
  • pin 4 - Ground

Serial EEPROM

The Zippy2 provides an AT24C01 serial EEPROM that contains a Vendor ID and a Device ID that the BeagleBoard uses to identify the type of board connected to the expansion header. This information enables the BeagleBoard to auto-configure the pin mux for signals needed by the Zippy2. More information can be found on the Beagle Board Pin Mux Page.

Soldering BeagleBoard's Expansion Header

This is a quick guide showing you how to solder the 2x14 Header into the BeagleBoard’s Expansion connector (J3).

Zippy2-expansion connector1.jpg

Insert the 2x14 Header’s SHORT PINS from the back side of the BeagleBoard into the BeagleBoard’s expansion connector (J3).


Zippy2-expansion connector2.jpg

Position the 2x14 Header so the LONG PINS are on the BACK SIDE of the BeagleBoard.


Zippy2-expansion connector3.jpg

Solder the SHORT PINS of the 2x14 Header from the TOP SIDE of the BeagleBoard.

Attaching to the BeagleBoard

Zippy2-expansion connector7.jpg

Attach the four board spacers with the screws provided.


Zippy2-expansion connector4.jpg

Connect the expansion board onto the BACK SIDE of the BeagleBoard by mating with the 2x14 Header you just soldered. Make sure all of the pins align correctly.


Zippy2-expansion connector5.jpg

Continue pushing the two boards together until the connectors mate together.


Zippy2-expansion connector6.jpg

Attach the male standoffs as shown.


Zippy2-expansion connector8.jpg

Creating a bootable SD card in Ubuntu

This guide will demonstate how to create a dual-partition SD card for the BeagleBoard/Zippy2 combination to boot Linux from the first partition and have the root file system located on the second partition.

This guide covers the same procedure as SDCard setup and LinuxBootDiskFormat.

This guide will use a 2GB SD card for all examples.

Determine which device the SD Card Reader is on your system

Insert the SD Card into the SD Card Reader reader on your Linux PC. Then determine which device it is on your system:

dmesg | tail
...
[2079456.496092] sd 34:0:0:0: [sdb] Mode Sense: 03 00 00 00
[2079456.496096] sd 34:0:0:0: [sdb] Assuming drive cache: write through
[2079456.513743] sd 34:0:0:0: [sdb] Assuming drive cache: write through
[2079456.513751]  sdb: sdb1
[2079456.529193] sd 34:0:0:0: [sdb] Assuming drive cache: write through
[2079456.529201] sd 34:0:0:0: [sdb] Attached SCSI removable disk

In this case it shows up as /dev/sdb (note sdb insite the square brackets above).

Check to see if the automounter has mounted the SD Card:

df -h
Filesystem            Size  Used Avail Use% Mounted on
...                   1.8G     0  1.8G   0% /lib/init/rw
/dev/sdb1             1.9G     0  1.9G   0% /media/6262-9331
...

If mounted, unmount the SD card

umount /media/6262-9331

Start fdisk:

sudo fdisk /dev/sdb

Print the partition record:

  Command (m for help): p

  Disk /dev/sdb: 1967 MB, 1967128576 bytes
  57 heads, 56 sectors/track, 1203 cylinders
  Units = cylinders of 3192 * 512 = 1634304 bytes
  Disk identifier: 0x00000000

  Device Boot      Start         End      Blocks   Id  System
  /dev/sdb1            1        1204     1920955+   6  FAT16

Note card size in bytes listed above (in this example: 1967128576). Write this number down, it will be needed later below.

Delete any partitions that are already on the SD card

 Command (m for help): d
 Selected partition 1

Set the Geometry of the SD Card

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 card you are using:

  Expert command (m for help): h
  Number of heads (1-256, default 57): 255

  Expert command (m for help): s
  Number of sectors (1-63, default 56): 63
  Warning: setting sector offset for DOS compatiblity

  Expert command (m for help): c
  Number of cylinders (1-1048576, default 1203): 239

The 239 entered in the cylinders above must be calculated based upon the size of your particular SD card.

Now Calculate the number of Cylinders for your SD card:

number of cylinders = FLOOR (the number of Bytes on the SD Card (from above) / 255 heads / 63 sectors / 512 sector size in bytes )

So for this example: 1967128576 / 255 / 63 / 512 = 239.156427 (use Google to calculate). So we use 239 (i.e. truncate, don't round).

Return to "Normal" mode:

Expert command (m for help): r


Print the partition record to check your work:

 
 Command (m for help): p

 Disk /dev/sdb: 1967 MB, 1967128576 bytes
 255 heads, 63 sectors/track, 239 cylinders
 Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System

Create the FAT32 partition for booting and transferring files from your PC

 Command (m for help): n
 Command action
    e   extended
    p   primary partition (1-4)
 p
 Partition number (1-4): 1
 First cylinder (1-15, default 1): 1
 Last cylinder or +size or +sizeM or +sizeK (1-239, default 239): 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))

We use 50 cylinders of the total of 239 for the FAT32 partition above. The remainder of the cylinders will be used for the Linux root file system below.

Mark this FAT32 partition as bootable:

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 (51-239, default 51): 51
 Last cylinder or +size or +sizeM or +sizeK (51-239, default 239): 239

Print the partition record to check your work

 
 Command (m for help): p

 Disk /dev/sdb: 1967 MB, 1967128576 bytes
 255 heads, 63 sectors/track, 239 cylinders
 Units = cylinders of 16065 * 512 = 8225280 bytes


   Device Boot      Start         End      Blocks   Id  System
 /dev/sdb1               1         50     1920955+   c  w95 FAT32 (LBA)
 /dev/sdb2              51         239               83 Linux

Save the new partition records on the SD card

This is an important step. All work up to now has been temporary.

  Command (m for help): w
  The partition table has been altered!
 
  Calling ioctl() to re-read partition table.
 
  WARNING: If you have created or modified any DOS 6.x
  partitions, please see the fdisk manual page for additional
  information.
  Syncing disks.

Format the partitions

  sudo mkfs.msdos -F 32 /dev/sdb1 -n boot
  mkfs.msdos 3.0.3 (18 May 2009)

  sudo mkfs.ext3 -L rootfs /dev/sdb2
  mke2fs 1.41.9 (22-Aug-2009)
  Filesystem label=rootfs
  OS type: Linuxsudo mkfs.ext3 -L rootfs /dev/sdb2
  mke2fs 1.41.9 (22-Aug-2009)
  Filesystem label=rootfs
  OS type: Linux
  Block size=4096 (log=2)
  Fragment size=4096 (log=2)
  95040 inodes, 379535 blocks
  18976 blocks (5.00%) reserved for the super user
  First data block=0
  Maximum filesystem blocks=390070272
  12 block groups
  32768 blocks per group, 32768 fragments per group
  7920 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: done

Copy files onto the BOOT partition

You will need to download the demo/test files for the BeagleBoard/Zippy2 combination:

  1. MLO (save as MLO)
  2. u-boot.bin (save as u-boot.bin)
  3. uImage (save as uImage)
  4. test.rootfs.tar.gz (save as test.rootfs.tar.gz)


And now copy the first three files onto the boot partition (IMPORTANT: Copy MLO FIRST! because of a bug in the X-loader which causes problems if MLO is not the first file written onto the boot partition).

 cp MLO /media/boot/MLO
 cp u-boot.bin /media/boot/u-boot.bin
 cp uImage /media/boot/uImage

Copy the files onto the Linux partition

The next step is to extract the files in test-rootfs.tar.gz into the rootfs partition (NOT the boot partition) on the SD card. This can only be done by using Linux.

 sudo tar -zxvf test-rootfs.tar.gz -C /media/rootfs

Unmount the SD card from the Linux PC and insert it into the BeagleBoard's SD connector.

Then boot your BeagleBoard while holding down the "User" button.

Automated script to create a bootable SD card

The following script will create a formatted SD card using your Linux PC.

Make a working directory for the files: mksdcard.sh, MLO, u-boot.bin, uImage, and test-rootfs.tar.gz and copy them into it.

You will also need to make two mount points:

 mkdir /mnt/sdcard1
 mkdir /mnt/sdcard2

Then from inside the working directory you created above, issue the command like this:

 ./mksdcard.sh /dev/sdb

Where /dev/sdb is the drive for the SD card.

This should generate a fresh bootable SD card for you!

Design Documents

The following are the design documents for the Zippy2 (KSZ8851SNL-BBE-EVAL) board:

Software Links

The latest Linux driver for the KSZ8851SNL is included in the mainline Linux kernel and can be downloaded here:

http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.32.7.tar.bz2

Also, Linus' GIT repo can be pulled from here:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=summary

Or you can view just the driver:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=drivers/net/ks8851.c;h=6d3ac65bc35cfcd1ae3eb27e6249a8be38efe705;hb=HEAD

Programming the Zippy2

All of the devices on the Zippy2 work as standard linux devices which means any reference material for these devices is applicable:

How to access the I2C bus (from software): http://i2c.wiki.kernel.org/index.php/Linux_2.6_I2C_development_FAQ

How to access the second UART: http://tldp.org/HOWTO/Serial-HOWTO.html and http://www.vanemery.com/Linux/Serial/serial-console.html

How to use and configure the Ethernet port: http://tldp.org/HOWTO/Ethernet-HOWTO.html

How to access the SD card: If you are using the Angstrom images, then all you have to do is insert the SD card and it will be automatically mounted. To check just issue the command "mount" at the prompt to view the currently mounted devices.


To set the real time clock (RTC) on the Zippy2 board:

First: Set the date:

 date -s 2010.02.15-17:52

(date -s YYYY.MM.DD-HH:SS (the time HH:SS is in 24 hour format)

Then write the current date into the RTC's hardware registers:

 hwclock -w

As long as you have a good backup battery (the small coin battery), the RTC should keep the time correct even if you remove power and boot-up the BeagleBoard at a later time.

Where to purchase the Zippy2 (KSZ8851SNL-BBE-EVAL)

The Zippy2 can be purchased from TinCanTools.com (USA) and watterott.com (Germany)