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== 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, | + | 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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== Features == | == Features == | ||
− | * Atmel AT91RM9200 processor (Arm9 processor with MMU | + | * 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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* POE capable (48v -> 5v Power supply can be implemented on a motherboard) | * POE capable (48v -> 5v Power supply can be implemented on a motherboard) | ||
− | == | + | == Licence == |
All files for this project are licensed under the GNU GPL V2 | All files for this project are licensed under the GNU GPL V2 | ||
− | == | + | == Project files == |
− | Warning!!! | + | Warning!!! This is an untested design. As testing results are available I will post them on this site. |
− | * [ | + | * [[Media:linuxstamp-rev111-top.pdf|PCB Top view (pdf)]] |
− | + | * [[Media:linuxstamp-rev111-bottom.pdf|PCB Bottom view (pdf)]] | |
− | + | * [[Media:linuxstamp-rev111-sch.pdf|Schematic (pdf)]] | |
− | * [ | + | * [http://greenflaginc.com/linuxstamp-20070513.zip Project zip file] |
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== Power == | == Power == | ||
− | The power supply for the board is based on the Linear LTC3407-3. This is a very compact high frequency switching power supply. It has both a 3.3v and a 1.8v output. It does have a very tight input range 3.3v-5.5v. The Micrel PHY also needs 2.5v, but this is provided by an internal regulator. Currently a regulated 5v must be used to power the board. Talking with Jeff from Jendy Labs it seems like POE (Power Over Ethernet) is a good idea. [http://en.wikipedia.org/wiki/Power_over_Ethernet | + | The power supply for the board is based on the Linear LTC3407-3. This is a very compact high frequency switching power supply. It has both a 3.3v and a 1.8v output. It does have a very tight input range 3.3v-5.5v. The Micrel PHY also needs 2.5v, but this is provided by an internal regulator. Currently a regulated 5v must be used to power the board. Talking with Jeff from Jendy Labs it seems like POE (Power Over Ethernet) is a good idea. [http://en.wikipedia.org/wiki/Power_over_Ethernet Wekipedia] has a good general description of POE. The basic idea is that POE provides 48v and up to 13 watts, more than enough power for the Linuxstamp. The problem for the module is that a 48v -> 5v power supply is not small or cheap. In order to take advantage of POE without increasing the board size I found a part from Transtek Magnetics that is made for POE and has the rectifier built into the jack. The 48v lines are then connected to the pin header. This will allow a motherboard to integrate a POE power supply. |
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+ | == Status == | ||
+ | Free DFM looks good for the design. We should order the boards any day now. Here are the links if anyone is interested. | ||
+ | * [https://www.freedfm.com/freedfm/0010258501690061/results/plots.htm Plots] from Free DFM | ||
+ | * [https://www.freedfm.com/freedfm/0010258501690061/quote.asp Quotes] from Free DFM. | ||
== Minicom & the debug port == | == Minicom & the debug port == | ||
− | The | + | 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 incriment 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. 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''' |
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− | When you plug the Linuxstamp into your host ( | ||
− | + | == 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 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 | |
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− | == Cross | ||
− | 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 | ||
*"'''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. | ||
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== Booting == | == Booting == | ||
− | The AT91RM9200 has several features the | + | The AT91RM9200 has several features the faciliate easy booting. There is a good description of the booting order [http://www.open-research.org.uk/ARMuC/At91rm9200_Booting.html here]. Atmel provides a tiny [http://www.atmel.com/dyn/resources/prod_documents/uboot-DataFlash_1_01.zip program] that lives in the Dataflash and loads u-boot (see next section). |
== U-boot == | == U-boot == | ||
− | First we need | + | 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 below). 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. | ||
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== Busybox == | == Busybox == | ||
− | [http://www.busybox.net/ Busybox] provides the necessary | + | [http://www.busybox.net/ Busybox] provides the necessary utilties (e.g ls, cp, etc...). After you have downloaded and unpacked busybox we are ready to get started (I was using version 1.4.2). |
* $ '''make defconfig''' | * $ '''make defconfig''' | ||
Now for a quick test we can make busybox for our host machine | Now for a quick test we can make busybox for our host machine | ||
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But we want to build busybox for our embedded system so run | But we want to build busybox for our embedded system so run | ||
* $ '''make ARCH=arm CROSS_COMPILE=arm-linux-''' | * $ '''make ARCH=arm CROSS_COMPILE=arm-linux-''' | ||
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− | == Building the | + | == Building the 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 | + | 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 kernel.org (I was using 2.6.22.7), 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. | + | * $ '''patch -p1 < 2.6.22-at91.patch''' |
Now lets take a look at the default configurations | Now lets take a look at the default configurations | ||
* $ '''make ARCH=arm help''' | * $ '''make ARCH=arm help''' | ||
− | + | I don't know which will be the closest to the linuxstamp but lets try 'at91rm9200dk_defconfig' | |
− | * $ '''make ARCH=arm | + | * $ '''make ARCH=arm at91rm9200dk_defconfig''' |
If we what to further customize the build we can use 'xconfig' | If we what to further customize the build we can use 'xconfig' | ||
* $ '''make ARCH=arm xconfig''' | * $ '''make ARCH=arm xconfig''' | ||
− | Now we're are ready to build the kernel | + | Now we're are ready to build the kernel |
− | + | * $ '''make ARCH=arm CROSS_COMPILE=arm-linux- zImage''' | |
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− | * $ '''make ARCH=arm CROSS_COMPILE=arm-linux- | ||
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== Dropbear SSH == | == Dropbear SSH == | ||
− | One of the first non busybox tools | + | One of the first non busybox tools we will want is SSH. Dropbear is a small SSH client/server. I was able to build version 0.50. |
− | + | * $ '''./configure --host="arm-linux" --disable-zlib ''' | |
− | + | * $ '''make''' | |
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− | * $ '''./configure --host="arm-linux" --disable-zlib | ||
− | * $ '''make | ||
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− | == | + | == Eagle Stuff == |
− | + | I will put tools and libaries here. | |
− | + | * I would post a cam job, but opencircuits won't let me upload a .cam file | |
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== 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 | ||
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*[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 | ||
− | + | *[http://www.jendylabs.com/ Jendy Labs] | |
− | *[http:// | + | *[http://opencircuits.com/Linuxstamp_Mboard_1 Mborad 1] for the linuxstamp |
− | *[http:// | ||
− | == | + | == Pricing == |
− | The | + | 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) | |
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+ | This is not a true USB port is it? Its just a usb serial peripheral port, therefore USB stick will not work. | ||
+ | :Should be answered by the last answer, too. An USB stick is also USB peripheral^^ --SebDE | ||
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+ | This is not a USB host....it (Linuxstamp)is seen as the peripheral surely? | ||
+ | :From the Features: | ||
+ | :''1x USB host port (allows wifi adapters, flash drives and other USB devices to be used)'' | ||
+ | :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. | ||
+ | :--SebDE | ||
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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) | ||
== 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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[[Category:Projects]] | [[Category:Projects]] |