Difference between revisions of "FPGA loader"

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On this page, you will find all the informations needed to use the FPGA loader driver.
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[[Category: FPGA]]
  
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== Module compilation & installation==
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On this page, you will find all the informations needed to use the Linux FPGA loader driver.
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The first thing you have to do is to select the driver in the Linux configuration tool.
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This driver allows you to load the FPGA of your APF board from Linux userspace/shell (ie FPGA reprogrammation after Linux boot).
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# cd buildroot/build_arm_nofpu/linux.2.6.xx/
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Start the configuration tool:
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# make menuconfig
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In Device Drivers, Armadeus specific drivers select "Armadeus FPGA configuration driver".
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== Driver installation==
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Then, you have to start again the top make.
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Driver is installed in default Armadeus rootfs.
  
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Once done, you will find the new driver in the /lib/modules/drivers/ of the rootfs
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For the hackers, code is located in ''target/linux/modules/fpga/dev_tools/fpga_devtools/''.
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In the host directory armadeus/target/linux/modules/fpga_devtools you will find a script named fpgaloader.sh.  
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Copy this script on the target and lauch it
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== Driver usage ==
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# sh fpgaloader.sh
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This will install the driver.
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*Remark
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*To upload a new firmware, use the small helper script that can do all the job for you (load driver and then firmware). Just call it with the bitfile (.rbf for APF6SP and .bin for the other boards) as parameter. For example:
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The default FPGA version is the spartan3 200k.
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<pre class="apf">
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The version can be changed when installing the module (insmod /lib/modules/drivers/fpgaloader.ko fpga_descriptor=0 for a 200K and 1 for a 400k).  
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# load_fpga bramtest_top_apf.bin
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These informations are given by the proc interface.
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</pre>
  
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== Driver usage ==
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* For APF6_SP a periph.rbf must be [[Target_Software_Installation#APF6_SP | loaded in U-Boot]] before, the core.rbf can then be loaded under linux with load_fpga:
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The FPGA loader driver is usable through the standard Linux filesystem interface:
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<pre class="apf">
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To read the available configurations, do:
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  # load_fpga firmware.core.rbf
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  # cat /proc/driver/fpga/loader
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</pre>
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To upload a new firmware (here ''bramtest_top.bin''), write:
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* [[Simple_blinking_LED |  You can find some ready to use bitfiles in ''firmware/leds/blinking_led/bin/'' (blinking LED).]]
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# dd if=bramtest_top.bin of=/dev/fpga/fpgaloader
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{{Note| On '''APF6_SP''' the command load_fpga work only throught PCIe, see [[PCIe fpga load]] to know how it works}}
  
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== FPGARegs usage ==
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==Troubleshots==
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Write to a FPGA address
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=== APF51 ===
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* fpgareg addr value
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* Use binary format '''.bin''', bitstream format '''.bit''' doesn't work.
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# fpgaregs 1000 abcd
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this will write 0xabcd (16bits only interface) at the FPGA internal address 0x1000
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Read a FPGA address
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All the troubleshots are handled by the ''/usr/bin/load_fpga'' utility, mentionned above.
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* fpgareg addr
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# fpgaregs 1000
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this will read the address 0x1000
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For details take a look at this page: [[Linux Debug |Tips to debug under Linux]]
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[[Category:FPGA]]

Latest revision as of 07:41, 27 August 2015


On this page, you will find all the informations needed to use the Linux FPGA loader driver. This driver allows you to load the FPGA of your APF board from Linux userspace/shell (ie FPGA reprogrammation after Linux boot).

Driver installation

Driver is installed in default Armadeus rootfs.

For the hackers, code is located in target/linux/modules/fpga/dev_tools/fpga_devtools/.

Driver usage

  • To upload a new firmware, use the small helper script that can do all the job for you (load driver and then firmware). Just call it with the bitfile (.rbf for APF6SP and .bin for the other boards) as parameter. For example:
 # load_fpga bramtest_top_apf.bin
  • For APF6_SP a periph.rbf must be loaded in U-Boot before, the core.rbf can then be loaded under linux with load_fpga:
 # load_fpga firmware.core.rbf
Note Note: On APF6_SP the command load_fpga work only throught PCIe, see PCIe fpga load to know how it works


Troubleshots

APF51

  • Use binary format .bin, bitstream format .bit doesn't work.

All the troubleshots are handled by the /usr/bin/load_fpga utility, mentionned above.

Retrieved from "http://armadeus.org/wiki/index.php?title=FPGA_loader&oldid=13496"