FPGA loader: Difference between revisions

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[[Category: FPGA]]
On this page, you will find all the informations needed to use the Linux FPGA loader driver.
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 -> FPGA reprogrammation after Linux boot.
This driver allows you to load the FPGA of your APF board from Linux userspace/shell (ie FPGA reprogrammation after Linux boot).
 
== Module compilation & installation==
The first thing you have to do is to select the driver in the Linux configuration tool.
# cd buildroot/build_arm_nofpu/linux.2.6.xx/
Start the configuration tool:
# make menuconfig
 
In Device Drivers, Armadeus specific drivers select "Armadeus FPGA configuration driver".
Then, you have to start again the top make.
 
Once done, you will find the new driver in the /lib/modules/drivers/ of the rootfs
In the host directory armadeus/target/linux/modules/fpga_devtools you will find a script named fpgaloader.sh.  


Copy this script on the target and launch it
== Driver installation==
# sh fpgaloader.sh
Driver is installed in default Armadeus rootfs.
This will install the driver.


*Remark
For the hackers, code is located in ''target/linux/modules/fpga/dev_tools/fpga_devtools/''.
The default FPGA version is the spartan3 200k.
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).
These informations are given by the /proc interface.


== Driver usage ==
== Driver usage ==
The FPGA loader driver is usable through the standard Linux filesystem interface:
To read the available configurations, do:
# cat /proc/driver/fpga/loader
The displayed sizes correspond to the different FPGA versions supported by the board:
* 130k: spartan 200k
* 212k: spartan 400k


To upload a new firmware (here ''bramtest_top_apf.bin''), write:
*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:
  # dd if=bramtest_top_apf.bin of=/dev/fpga/fpgaloader
<pre class="apf">
  # load_fpga bramtest_top_apf.bin
</pre>
or
<pre class="apf">
# load_fpga firmware.core.rbf
</pre>


== FPGARegs usage ==
* [[Simple_blinking_LED |  You can find some ready to use bitfiles in ''firmware/leds/blinking_led/bin/'' (blinking LED).]]
* Write to a FPGA address: ''fpgareg addr value''  
# fpgaregs 1000 abcd
this will write 0xabcd (16bits only interface) at the FPGA internal address 0x1000


* Read a FPGA address: ''fpgareg addr''
# fpgaregs 1000
this will read the address 0x1000


For details take a look at this page: [[Linux Debug |Tips to debug under Linux]]


[[Category:FPGA]]
[[Category:FPGA]]

Latest revision as of 14:03, 3 October 2025


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

or 

 # load_fpga firmware.core.rbf
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