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[[Image:linuxstamp_top_02.jpg]]
 
[[Image:linuxstamp_top_02.jpg]]
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== Status ==
 +
We now have working linuxstamp prototypes. There are a few minor hardware changes needed, and then we will make a production run.
  
 
== Description ==
 
== Description ==
 
The Linuxstamp is designed to be a general purpose processor module. It is designed to work as a stand alone module (SD card, Ethernet and USB/Serial converter are all on the module). This allows all initial development to be done without a motherboard, but for integration into a specific project a motherboard with specific features could be designed. Check out the start of the first mother board for the Linuxstamp, [http://opencircuits.com/Linuxstamp_Mboard_1 Mboard 1].
 
The Linuxstamp is designed to be a general purpose processor module. It is designed to work as a stand alone module (SD card, Ethernet and USB/Serial converter are all on the module). This allows all initial development to be done without a motherboard, but for integration into a specific project a motherboard with specific features could be designed. Check out the start of the first mother board for the Linuxstamp, [http://opencircuits.com/Linuxstamp_Mboard_1 Mboard 1].
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== Status ==
 
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You can now purchase Linuxstamp boards from [http://thelinuxstamp.com/shop/catalog/browse?shop_param= thelinuxstamp.com]
 
  
 
== Features ==
 
== Features ==
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* Atmel AT91RM9200 processor (Arm9 processor with MMU, 180Mhz operation)
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* Atmel AT91RM9200 processor (Arm9 processor with MMU)
 
* 32MB SDRAM (Only limited by 1x 54-TSOP SDRAM chip)
 
* 32MB SDRAM (Only limited by 1x 54-TSOP SDRAM chip)
 
* 8MB SPI Dataflash
 
* 8MB SPI Dataflash
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All files for this project are licensed under the GNU GPL V2
 
All files for this project are licensed under the GNU GPL V2
  
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== Hardware design files ==
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== Project files ==
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Warning!!! Use this design at your own risk.
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Warning!!! This is an untested design. As testing results are available I will post them on this site.
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* [http://linuxstamp.budgetdedicated.com/index.php?dir=&file=linuxstamp_design.zip Project zip file]
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* [[Media:linuxstamp-rev111-top.pdf|PCB Top view (pdf)]]
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* [http://linuxstamp.budgetdedicated.com/index.php?dir=&file=linuxstamp121-sch.pdf Schematic]
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* [[Media:linuxstamp-rev111-bottom.pdf|PCB Bottom view (pdf)]]
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* [http://linuxstamp.budgetdedicated.com/index.php?dir=&file=linuxstamp121-top.pdf Top layer]
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* [[Media:linuxstamp-rev111-sch.pdf|Schematic (pdf)]]
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* [http://linuxstamp.budgetdedicated.com/index.php?dir=&file=linuxstamp121-bottom.pdf Bottom layer]
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* [http://greenflaginc.com/linuxstamp-20070513.zip Project zip file]
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If you want to use the Linuxstamp for your project you can get an Eagle library file [http://linuxstamp.budgetdedicated.com/index.php?dir=&file=linuxstamp.lbr here]
 
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or just an image [http://linuxstamp.budgetdedicated.com/index.php?dir=&file=headers.PNG here]
 
  
 
== Power ==
 
== Power ==
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== Minicom & the debug port ==
 
== Minicom & the debug port ==
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The mini-USB device port on the Linuxstamp does not connect directly to the AT91RM9200 it connects to the FT232R chip. The FT232R is a USB/serial converter. The FT232R chip has drivers for both Windows and Linux, but the Linux drivers are included in later kernels. Drivers for Mac OS X are available [http://www.ftdichip.com/FTDrivers.htm here].
+
The USB device port on the Linuxstamp does not connect directly to the AT91RM9200 it connects to the FT232R chip. The FT232R is a USB/serial converter. The FT232R chip has drivers for both Windows and Linux, but the Linux drivers are included in later kernels. When you plug the Linuxstamp into your host (Linux) machine a device should appear '''/dev/ttyUSB0''' (I think the postfix number will increment as you add more devices). '''/dev/ttyUSB0''' will behave as any other serial port now. '''Minicom''' is the standard program to access the serial port in Linux. The first time you run minicom you will have to be root in order to do the setup, after that you can change the permissions on /dev/ttyUSB0 so any user can run minicom. To enter configuration mode in minicom type '''CTRL-A o''', now scroll down to '''Serial port setup'''. Use the letters to navigate. You will want the device to be '''/dev/ttyUSB0''' and '''Bps/Par/Bits''' to read '''115200 8N1'''. Connection to the board is important for loading Atmel's tiny program and u-boot, but once the board is working it might not be as important.
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+
<br><br>
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When you plug the Linuxstamp into your host (Linux) machine a device should appear '''/dev/ttyUSB0''' (I think the postfix number will increment as you add more devices). '''/dev/ttyUSB0''' will behave as any other serial port now. '''Minicom''' is the standard program to access the serial port in Linux. The first time you run minicom you will have to be root in order to do the setup, after that you can change the permissions on /dev/ttyUSB0 so any user can run minicom. To enter configuration mode in minicom type '''CTRL-A o''', now scroll down to '''Serial port setup'''. Use the letters to navigate. You will want the device to be '''/dev/ttyUSB0''' and '''Bps/Par/Bits''' to read '''115200 8N1'''. Both hardware and software flow control should be OFF. Connection to the board is important for loading Atmel's tiny program and u-boot, but once the board is working it might not be as important.
+
The built in xmodem in minicom does not seem to work with the hardware bootloader in the AT91RM9200. The folks at [http://www.koansoftware.com/it/art.php?art=68 Koan] have created a workaround. The one thing you have to do is edit the .c file for the proper serial port ttyUSB0 in my case.
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The default installation of minicom does not automatically include the XModem file transfer module 'sx' which you will need to send files.  It is part of the Linux package named lrzsz ([http://packages.debian.org/lenny/lrzsz lrzsz]).  Just type 'sx' at a command line to see if it is installed.  If not, install the lrzsz package and minicom will find and use 'sx' automatically.
 
−
 
 
−
XModem transfers between Minicom and U-Boot seem to work fine.  This means that you can update U-Boot itself as well as the kernel and root file systems using Minicom after getting U-Boot itself installed via the built-in hardware bootloader in the AT91RM9200. The bootloader is much more finicky than U-Boot itself, so getting U-Boot installed can be tricky.  Here is my technique:
 
−
 
 
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* Connect the USB cable to LinuxStamp and start minicom from a terminal window.
 
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* Boot the LinuxStamp. You should see CCC... on the minicom console, with a new C every second or two.
 
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* Hit Enter twice.  This will stall the bootloader, and the CCC... sequence will stop.  It will also synchronize the USB/serial converter.
 
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* Hit Ctrl-A Z S sequence to bring up the file transfer dialog in minicom. Select XModem and navigate to and select your u-boot.bin file (space bar).
 
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* Hit Enter to start the xmodem transfer in minicom.
 
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* Press and release the reset pushbutton on the LinuxStamp.  The transfer should happen very quickly (a few seconds).
 
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* Immediately hit Enter twice when you see the transfer complete.  You *must* do this very quickly (within 1 second or so), and you *must* hit Enter twice.  The first time exits the minicom file tranfer dialog, and the second time stalls the newly-loaded U-Boot program so that it doesn't try to auto-run the not-yet-loaded Linux kernel image.
 
−
 
 
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You now have U-Boot in RAM, but not yet in flash.  However, U-Boot is a lot nicer than the hardware bootloader, so you can now use U-Boot to load itself into flash by using the U-Boot menu and retransferring the u-boot.bin file again.  This second time, the transfer will end up in flash, and will persist through poweroff/on.
 
−
 
 
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Another alternative is to use HyperTerm on Windows, which works fine with the Hardware boot loader. If you are updating the Darrel Bootloader, note that the loader only has a short delay after you initiate the "receive" (on the loader) after which it send out the "ready to receive" signal. As a result, you'll need to be rather quick to initiate the Xmodem "send" (on HyperTerm). If you are seeing time outs on HyperTerm when you try and send the loader.bin file, you are probably hitting this problem ... you need to have initiated the send before you see the "C" on the screen from the bootloader.
 
  
 
== nfs & tftp ==
 
== nfs & tftp ==
 
Nfs (network file system) and tftp (trivial file transfer protocol) are two servers you will want running on your host machine. Nfs is useful for hosting the root file system of the Linuxstamp. Tftp is useful for u-boot to retrieve the kernel from. There are many other websites on nfs and tftp, but I will try and go over a simple setup. I would suggest being behind a firewall before trying either of these setups as neither is secure. I wrote this using a Fedora 7 system. First make sure you have nfs installed.
 
Nfs (network file system) and tftp (trivial file transfer protocol) are two servers you will want running on your host machine. Nfs is useful for hosting the root file system of the Linuxstamp. Tftp is useful for u-boot to retrieve the kernel from. There are many other websites on nfs and tftp, but I will try and go over a simple setup. I would suggest being behind a firewall before trying either of these setups as neither is secure. I wrote this using a Fedora 7 system. First make sure you have nfs installed.
−
 
+
*$ '''yum install nfs-utils nfs-utils-lib portmap system-config-nfs'''
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$ '''yum install nfs-utils nfs-utils-lib portmap system-config-nfs'''
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Now to make sure the service is enabled run:
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*$ '''serviceconf''' and make sure '''nfs''' and '''nfs lock''' are checked
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On Ubuntu (or other debian-style systems) you could use:
 
−
 
 
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$ '''sudo apt-get install portmap nfs-kernel-server nfs-common'''
 
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−
Now to make sure the service is enabled run (this won't work on Ubuntu):
 
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$ '''serviceconf''' and make sure '''nfs''' and '''nfs lock''' are checked
 
 
Now edit '''/etc/exports''' you should add a line like this '''/path_to_nfs_root/ *(rw,no_root_squash,insecure)'''. Now restart nfs.
 
Now edit '''/etc/exports''' you should add a line like this '''/path_to_nfs_root/ *(rw,no_root_squash,insecure)'''. Now restart nfs.
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$ '''sudo /etc/init.d/nfs restart'''
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*$ '''/etc/init.d/nfs restart'''
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You can test that it is set up correctly by typing the following on the local system (i.e. right on the NFS server)
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You can test this with
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$ '''showmount -e localhost'''
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*$ '''mount -t nfs server_name:/path_to_nfs_root /path_to_test_mount'''
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You can test this from a remote system with
 
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$ '''mount -t nfs server_name:/path_to_nfs_root /path_to_test_mount'''
 
 
Now on to tftp. Make sure it is installed.
 
Now on to tftp. Make sure it is installed.
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$ '''yum install tftp-server'''
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*$ '''yum install tftp-server'''
 
This will create a file '''/etc/xinetd.d/tftp'''. In this file you will want to change '''disable''' from '''yes''' to '''no'''.
 
This will create a file '''/etc/xinetd.d/tftp'''. In this file you will want to change '''disable''' from '''yes''' to '''no'''.
 
Now make a test file.
 
Now make a test file.
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$ '''cd /tftpboot'''
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*$ '''cd /tftpboot'''
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$ '''echo hello > file'''
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*$ '''echo hello > file'''
 
Now we can test it  
 
Now we can test it  
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$ '''tftp -v server_name -c get tmp'''
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*$ '''tftp -v server_name -c get tmp'''
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Now with u-boot we can load image files
 
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> '''tftpboot 20800000 uImage'''
 
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And boot them
 
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> '''bootm 20800000'''
 
  
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== Cross Compiler ==
+
== Cross Compilier ==
−
In order to compile for the AT91RM9200 we need to build a cross compilier. Dan Kegel has created a very useful [http://kegel.com/crosstool/ tool] for building a cross compiler. I am using Fedora 6 (x86_64) as my host system. After downloading and extracting crosstool (I was using version 0.43) I made two small changes. In the "demo-arm.sh" file I changed the eval line to  
+
In order to compile for the AT91RM9200 we need to build a cross compilier. Dan Kegel has created a very useful [http://kegel.com/crosstool/ tool] for building a cross compiliers. I am using Fedora 6 (x86_64) as my host system. After downloading and extracting crosstool (I was using version 0.43) I made two small changes. In the "demo-arm.sh" file I changed the eval line to  
 
*"'''eval `cat arm.dat gcc-3.4.5-glibc-2.3.6.dat` sh all.sh --notest'''"<br>
 
*"'''eval `cat arm.dat gcc-3.4.5-glibc-2.3.6.dat` sh all.sh --notest'''"<br>
 
In the "arm.dat" file I changed the TARGET to "arm-linux" (By default u-boot looks for arm-linux-* tools). Now if you run "demo-arm.sh" you should get a cross compilier.
 
In the "arm.dat" file I changed the TARGET to "arm-linux" (By default u-boot looks for arm-linux-* tools). Now if you run "demo-arm.sh" you should get a cross compilier.
−
 
−
On Debian-style-systems you need to run something like ''apt-get install build-essential bison flex'' to get the above to work.
 
  
 
== Booting ==
 
== Booting ==
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== U-boot ==
 
== U-boot ==
−
First we need [http://www.denx.de/wiki/UBoot u-boot] (doc) [http://www.denx.de/cgi-bin/gitweb.cgi source] (git) (formerly on [http://sourceforge.net/project/showfiles.php?group_id=65938 sourceforge]) (I was using version 1.1.6 - this is an old version). If you have not yet built a cross compilier now would be a good time to do so (See the cross compilier section above). Now you can do a test for the Atmel AT91RM9200 DK board.
+
First we need the u-boot source found [http://sourceforge.net/project/showfiles.php?group_id=65938 here] (I was using version 1.1.6). If you have not yet built a cross compilier now would be a good time to do so (See the cross compilier section above). Now you can do a test for the Atmel AT91RM9200 DK board.
 
* $ '''make at91rm9200dk_config'''
 
* $ '''make at91rm9200dk_config'''
 
* $ '''make'''
 
* $ '''make'''
 
This should give you a "u-boot.bin" file. We will have to write a board specific configuration file for the Linuxstamp. We should be able to base it off the the Atmel DK board. If you look at "/u-boot-1.1.6/include/configs/at91rm9200dk.h" you can see the configuration for the DK board.
 
This should give you a "u-boot.bin" file. We will have to write a board specific configuration file for the Linuxstamp. We should be able to base it off the the Atmel DK board. If you look at "/u-boot-1.1.6/include/configs/at91rm9200dk.h" you can see the configuration for the DK board.
−
<br>
 
−
Other u-boot commands:
 
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* > '''printenv''', prints the enviroment variables
 
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* > '''saveenv''', saves the enviroment variables
 
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* > '''setenv bootcmd 'tftpboot 20800000 uImage; bootm 20800000'''' Sets the boot command to load a image over tftp and boot it
 
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* > '''setenv bootargs mem=32M nfsroot=192.168.0.3:/nfs_root ip=192.168.0.51 console=ttyS0,115200n8 rootdelay=1'''
 
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This sets the command line to be passed to the kernel. As you can see it sets the nfsroot, ip address and console
 
  
 
== Busybox ==
 
== Busybox ==
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== Building the Linux Kernel ==
 
== Building the Linux Kernel ==
−
If you have ever built the kernel for your desktop, then cross-compiling the kernel isn't that much harder. First get the latest kernel from [http://kernel.org/ kernel.org] (I was using 2.6.23-rc9), then get the AT91RM9200 patch from [http://maxim.org.za/at91_26.html here]. After you unpack both of these you can apply the patch. From a Fedora 11 Live install you need the following packages: gcc, gcc-c++ and qt3-devel (for xconfig).
+
If you have ever built the kernel for your desktop, then cross-compiling the kernel isn't that much harder. First get the latest kernel from [http://kernel.org/ kernel.org] (I was using 2.6.23-rc9), then get the AT91RM9200 patch from [http://maxim.org.za/at91_26.html here]. After you unpack both of these you can apply the patch.
 
* $ '''patch -p1 < 2.6.23-rc3-at91.patch'''
 
* $ '''patch -p1 < 2.6.23-rc3-at91.patch'''
 
Now lets take a look at the default configurations
 
Now lets take a look at the default configurations
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Now we're are ready to build the kernel. You will have to have the u-boot tool '''mkimage''' in the '''PATH''' for this to work
 
Now we're are ready to build the kernel. You will have to have the u-boot tool '''mkimage''' in the '''PATH''' for this to work
 
* $ '''make ARCH=arm CROSS_COMPILE=arm-linux- uImage'''
 
* $ '''make ARCH=arm CROSS_COMPILE=arm-linux- uImage'''
−
If you want to build the modules you can do
 
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* $ '''make ARCH=arm CROSS_COMPILE=arm-linux- modules'''
 
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And then if you want to install the modules to an an NFS root or somewhere else do
 
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* # '''make ARCH=arm CROSS_COMPILE=arm-linux- modules_install INSTALL_MOD_PATH=/path_to_nfs_root/'''
 
  
 
== Minimal filesystem ==
 
== Minimal filesystem ==
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* $ '''mknod /staging_path/dev/console c 5 1'''
 
* $ '''mknod /staging_path/dev/console c 5 1'''
 
The '''c''' says this is a character device. The '''5''' is the major node, and the '''1''' is the minor node.
 
The '''c''' says this is a character device. The '''5''' is the major node, and the '''1''' is the minor node.
−
<br><br>
 
−
For development the most convenient way to work is by mounting an NFS root file system. Another easy way to deal with the root file system is by mounting it on either a USB drive or SD card, but if you want a stand alone system you will want the root filesystem to come from the onboard Dataflash. There are several steps to do this. The Dataflash on the Linuxstamp is 8MB. A little under 2MB is used for the bootloaders and the Linux kernel. This leaves about 6MB for the filesystem. The filesystem I am working with is about 10MB, so we will need to compress the filesystem. One method of doing this is to use the initramfs function in the kernel. The kernel expects the image to be a gzipped CPIO archive. In the kernel source there are tools to create the CPIO archive. First we must create a file list from our file system (presumedly this is just the root of your current NFS mount).
 
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<br>
 
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/!!Remember that you need a 'init' file in /. You can just link to /sbin/init
 
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* $ '''cd /path_to_linux_source'''
 
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* # '''scripts/gen_initramfs_list.sh /path_to_fs_root/ > cpio_list
 
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Next create the CPIO archive
 
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* # '''usr/gen_init_cpio cpio_list > initramfs.cpio'''
 
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You might have to make gen_init_cpio (in the usr dir)
 
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* # '''make gen_init_cpio'''
 
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Gzip the CPIO archive
 
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* $ '''gzip initramfs.cpio'''
 
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Now copy initramfs.cpio.gz to usr/initramfs_data.cpio.gz, and run the normal kernel make. You will notice that uImage is much larger (size = kernel + fs).
 
−
 
−
== Debian ==
 
−
If want the full Linux enviroment your used to then you can try out Debian on the Linuxstamp. A working Debian filesystem can be found on the [http://linuxstamp.budgetdedicated.com/index.php?dir=&file=sid_20080726.tar.bz2 ftp site.]
 
−
 
−
== Ptxdist ==
 
−
If you looking for more features than the minimal filesystem, but don't need the full Debian system then ptxdist is right for you. The folks over at [http://www.pengutronix.de/ Pengutronix] have done a very good job creating [http://www.pengutronix.de/software/ptxdist/index_en.html Ptxdist], a simple tool for building an embedded Linux distribution. If you want to test it out with the Linuxstamp, you can grab a build of the [http://linuxstamp.budgetdedicated.com/index.php?dir=&file=ptxroot_linuxstamp_20090124.tar.bz2 filesystem] and [http://linuxstamp.budgetdedicated.com/index.php?dir=&file=uImage_ptx_2.6.27_20090124 kernel]. If you want to try out ptxdist yourself, you can get the Linuxstamp project [http://linuxstamp.budgetdedicated.com/index.php?dir=&file=ptx_linuxstamp_pjt_20090124.tar.bz2 here].
 
  
 
== Dropbear SSH ==
 
== Dropbear SSH ==
 
One of the first non busybox tools you will want is SSH. Dropbear is a small SSH client/server. I was able to get version 0.50 working.
 
One of the first non busybox tools you will want is SSH. Dropbear is a small SSH client/server. I was able to get version 0.50 working.
−
*[http://matt.ucc.asn.au/dropbear/dropbear.html http://matt.ucc.asn.au/dropbear/dropbear.html]
 
−
 
−
 
 
* $ '''./configure --host="arm-linux" --disable-zlib --prefix=/staging_path'''
 
* $ '''./configure --host="arm-linux" --disable-zlib --prefix=/staging_path'''
 
* $ '''make all'''
 
* $ '''make all'''
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You will also have to have the devpts filesystem mounted.
 
You will also have to have the devpts filesystem mounted.
  
−
== 802.11 Wireless Networking ==
+
== Eagle Stuff ==
−
With the 2.6.27 vanilla kernel the ralink USB driver works very well. I've been using the AZIO AWU254 without any problems.
+
I will put tools and libraries here.
−
 
+
* I would post a cam job, but opencircuits won't let me upload a .cam file
−
== GPIO / Hardware Pin I/O ==
 
−
 
 
−
If you need some guidance figuring out how to 'bit twiddle' the GPIO (General Purpose I/O) pins on the at91 processor, here is a simple example with make file.  If you have your arm-linux cross compiler configured with CrossTool just unpack this file into a folder and type 'make' to generate the executable binary.
 
−
 
 
−
* [http://linuxstamp.budgetdedicated.com/downloads/at91_gpio_example.zip at91_gpio_example.zip]
 
−
 
 
−
This example shows how to set and clear output pins read input pins.
 
−
 
 
−
== Servos ==
 
−
[[Image:Servos.jpg]]
 
−
 
 
−
It is very easy to use the Linuxstamp with a RC servo controller like this one from [http://www.pololu.com/catalog/product/208/pictures pololu]. In this setup the board is powered from the USB connector, so I was able to use the power terminal to power the pololu module. On the under side of the pololu module I connected the servo power with the chip power. The only other thing that is needed is the serial TX line from the Linuxstamp (yellow wire). I created a very simple [http://linuxstamp.budgetdedicated.com/index.php?dir=&file=servo_test.tar.bz2 program] to run the servos. The following example would set servo 0 to a speed of 54 (64 is stopped) with an acceleration of 2.
 
−
*'''# ./servo_ser 0 2 54'''
 
  
 
== Links ==
 
== Links ==
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*[http://cadsoft.de/ Cadsoft.de]: Free (as in beer) tools for schematic and PCB design
 
*[http://cadsoft.de/ Cadsoft.de]: Free (as in beer) tools for schematic and PCB design
 
*[http://openhardware.wordpress.com/ openhardware.wordpress.com]: Here is my openhardware blog
 
*[http://openhardware.wordpress.com/ openhardware.wordpress.com]: Here is my openhardware blog
−
*[http://linuxstamp.budgetdedicated.com/ ftp site]: Here you will find tools and images like the crosscompilier and a debian file system
 
 
*[http://www.atmel.com/dyn/products/app_notes.asp?family_id=605 App notes]: for Atmel arm processors
 
*[http://www.atmel.com/dyn/products/app_notes.asp?family_id=605 App notes]: for Atmel arm processors
−
*[[Linuxstamp Mboard 1| Mborad 1]] for the Linuxstamp
+
*[http://www.jendylabs.com/ Jendy Labs]
−
*[http://wiki.emqbit.com/free-ecb-at91 ECB AT91] This is another open source project similar to the Linuxstamp. They have some [http://wiki.emqbit.com/wiki very good documentation].
+
*[http://opencircuits.com/Linuxstamp_Mboard_1 Mborad 1] for the Linuxstamp
−
*[http://www.budgetdedicated.com/ Budgetdedicated] Graciously hosts our ftp [http://linuxstamp.budgetdedicated.com/ site]
+
*[http://wiki.emqbit.com/wiki ECB AT91] This is another open source project similar to the Linuxstamp. They have somve very good documentation.
 +
 
 +
== Pricing ==
 +
The parts cost for qty 1 is $75 from digikey, and $55 for qty 100<br>
 +
I'm sure this can be greatly reduced with higher quantity<br>
 +
We will make a small run soon, and I will let you know when these are available.<br>
 +
 
 +
== Discussion ==
 +
 
 +
Can I plug a USB peripheral into the Linuxstamp, such as a USB Wifi adapter? --[[User:DavidCary|DavidCary]] 22:02, 17 April 2007 (PDT)<br>
 +
:Yes, any USB device that is supported by the kernel should work with the Linuxstamp. --[[User:Linuxvolts|Linuxvolts]] 23:15, 18 April 2007 (PDT)
  
−
== USB Info ==
+
This is not a true USB port is it? Its just a usb serial peripheral port, therefore USB stick will not work.
−
The AT91RM9200 has 2x USB host ports and 1x device port. I bring out one of the USB host ports directly from the chip to a USB A connector. There is also a mini USB B connector on the board this is connected to the FT232RQ (USB/serial converter) which in turn is connected to the debug serial port on the AT91RM9200. So the linuxstamp can be both a USB host and a USB device.
+
:Should be answered by the last answer, too. An USB stick is also USB peripheral^^ --SebDE
  
−
The FTDI driver creates a device /dev/ttyUSB0, a character device (this is how the Linuxstamp shows up on the host system).  You can read/write to it as if it was a terminal, tty, or serial port.  Above section on "Minicom & the debug port" points to communicating with the linuxstamp from a host computer. The FTDI232 chip connects to the mini-USB port.
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This is not a USB host....it (Linuxstamp)is seen as the peripheral surely?
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:From the Features:
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:''1x USB host port (allows wifi adapters, flash drives and other USB devices to be used)''
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:You can plug in any USB device that is supported by the kernel. The Linuxstamp is not supposed to be plugged via USB to a PC.
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:--SebDE
  
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== Discussion ==
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The AT91RM9200 has 2x USB host ports and 1x device port. I bring out one of the USB host ports directly from the chip to a USB A connector. There is also a mini USB B connector on the board this is connected to the FT232RQ (USB/serial converter) which in turn is connected to the debug serial port on the AT91RM9200. So the linuxstamp can be both a USB host and a USB device. --[[User:Linuxvolts|Linuxvolts]] 20:10, 4 July 2007 (PDT)
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Please join the google group for the Linuxstamp discussion
 
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http://groups.google.com/group/linuxstamp
 
  
 
== Contact ==
 
== Contact ==
 
For further questions or comments please contact Paul (pthomas8589 _at_ gmail _dot_ com)
 
For further questions or comments please contact Paul (pthomas8589 _at_ gmail _dot_ com)
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== other boards that run Linux ==
 
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* [[ARMUS Embedded Linux Board]]
 
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* [http://balloonboard.org/ Balloon board]
 
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* [http://www.bifferos.com/ Bifferboard]
 
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* [[Linuxstamp II 9260]]
 
  
 
[[Category:Projects]]
 
[[Category:Projects]]

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