Difference between revisions of "BeagleBoard Zippy2"
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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'. | 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'. | ||
− | mount | + | mount |
If the check with mount didn't work out, use dmesg: | If the check with mount didn't work out, use dmesg: |
Revision as of 10:26, 7 February 2010
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
Contents
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. Either connector is available for use: 1) standard DB9 Male connector, or 2) 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:
Installing the 3V lithium coin battery:
Insert the battery with the positive "+" side up.
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 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 here.
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).
Insert the 2x14 Header’s SHORT PINS from the back side of the BeagleBoard into the BeagleBoard’s expansion connector (J3).
Position the 2x14 Header so the LONG PINS are on the BACK SIDE of the BeagleBoard.
Solder the SHORT PINS of the 2x14 Header from the TOP SIDE of the BeagleBoard.
Attaching to the BeagleBoard
Attach the four board spacers with the screws provides.
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.
Continue pushing the two boards together until the connectors mate together.
Attach the male standoffs as shown.
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: BeagleBoardBeginners SDCard setup
Partition the SD card
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
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.
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'.
mount
If the check with mount didn't work out, use dmesg:
dmesg | tail
Watch out for a line like this:
[sdb] Attached SCSI removable disk
Where sdb could also be sdc or sdd. If it was sdb, the device name of the memory card is /dev/sdb. Unmount the card
The card will be mounted in /media, something like /dev/disk. Now unmount the disk:
sudo umount /media/disk
or: unmount manually in the file browser Start FDISK
Now start fdisk to check the partition table of the SD card. Start fdisk without partition number. So use '/dev/sda' or '/dev/sdb' and not /dev/sdb1'.
sudo fdisk /dev/sdb
Adjust the Geometry of the Card
Print the current partition table:
Command (m for help): PEnter
Disk /dev/sdb: 7948 MB, 7948206080 bytes 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.
Delete this partition:
Command (m for help): DEnter
Selected partition 1
Go into Expert mode:
Command (m for help): XEnter
Selected partition 1
Set the number of heads to 255
Expert command (m for help): HEnter
Number of heads (1-256, default 81): 255Enter
Set the number of sectors to 63
Expert command (m for help): SEnter
Number of sectors (1-63, default 10): 63Enter
This warning is normal and fine:
Warning: setting sector offset for DOS compatiblity
Now the number of cylinders has to be adjusted to match the size of your SDHC card:
cylinders = floor(bytes of the SDHC card (see the note above) / heads / sectors / sector size (512))
So for our 8GB microSDHC card, this is then (use Google to calculate):
7948206080 / 255 / 63 / 512 = 966.314348
So we cut off the decimal digits (not rounding) and use 966 for this example.
Expert command (m for help): CEnter
The number 966 is of course only valid for our 8GB SDHC card. Use your calculated number here!
Number of cylinders (1-1048576, default 19165): 966Enter
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
Create the boot partition
Create a new partition (the boot partition):
Command (m for help): NEnter
Command action
e extended p primary partition (1-4)
Create the first primary partition:
Command (m for help): PEnter
Command action
e extended p primary partition (1-4)
Partition number (1-4): 1Enter First cylinder (1-966, default 1): Enter
Using default value 1
Select cylinder 50 as last cylinder
Last cylinder, +cylinders or +size{K,M,G} (1-966, default 966): +50CEnter Create the Linux partition
Create a new partition (the linux partition):
Command (m for help): NEnter
Command action
e extended p primary partition (1-4)
Create the first primary partition:
Command (m for help): PEnter
Command action
e extended p primary partition (1-4)
Partition number (1-4): 2Enter First cylinder (52-966, default 52): Enter
Using default value 52
Select cylinder 966 as last cylinder (using the default)
Last cylinder, +cylinders or +size{K,M,G} (52-966, default 966): Enter Final Result
Check the result, it should now look like this (depending on the SDHC card size):
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
/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.
Command (m for help): WEnter
The partition table has been altered!
Calling ioctl() to re-read partition table. Syncing disks.
Finished! The next step is to format the new partitions. 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.
sudo mkfs.msdos -F 32 /dev/sdb1 -n BOOT
Format the Linux partition (labeled 'LINUX')
sudo mkfs.ext3 -L LINUX /dev/sdb2
Copy files onto SDHC card
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.
Unplug and re-plug your card reader in order to auto-mount the two new partitions
If your card is correctly formatted, then you can now copy the Linux system on it. This is covered in a special guide:
* Copy Linux filesystem on bootable SD car
Automated script
Design Documents
Software
- Demo/Test Files
- MLO (save as MLO)
- u-boot.bin (save as u-boot.bin)
- uImage (save as uImage)
- Kernel Config
- place these files on your formated SD card per the instuctions at the LinuxBootDiskFormat page
- boot your BeagleBoard while holding down the "User" button.