FPGA loader: Difference between revisions

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On this page, you will find all the informations needed to use the FPGA loader driver.
[[Category: FPGA]]


== Module compilation & installation==
On this page, you will find all the informations needed to use the Linux FPGA loader driver.
The first thing you have to do is to select the driver in the Linux configuration tool.
This driver allows you to load the FPGA of your APF board from Linux userspace/shell (ie FPGA reprogrammation after Linux boot).
# 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".
== Driver installation==
Then, you have to start again the top make.
Driver is installed in default Armadeus rootfs.


Once done, you will find the new driver in the /lib/modules/drivers/ of the rootfs
For the hackers, code is located in ''target/linux/modules/fpga/dev_tools/fpga_devtools/''.
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 lauch it
== Driver usage ==
# sh fpgaloader.sh
This will install the driver.


*Remark
*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:
The default FPGA version is the spartan3 200k.  
<pre class="apf">
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).  
# load_fpga bramtest_top_apf.bin
These informations are given by the proc interface.
</pre>
 
or
== Driver usage ==
<pre class="apf">
The FPGA loader driver is usable through the standard Linux filesystem interface:
  # load_fpga firmware.core.rbf
To read the available configurations, do:
</pre>
  # 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:
* [[Simple_blinking_LED |  You can find some ready to use bitfiles in ''firmware/leds/blinking_led/bin/'' (blinking LED).]]
# dd if=bramtest_top_apf.bin of=/dev/fpga/fpgaloader


== FPGARegs usage ==
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]]

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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