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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 compile the driver. The only way to do that actually is to compile it as a module:
This driver allows you to load the FPGA of your APF board from Linux userspace/shell (ie FPGA reprogrammation after Linux boot).
# cd target/linux/modules/fpga_devtools
Compile it:
# make ARCH=arm CROSS_COMPILE=/local/Armadeus/buildroot/build_arm_nofpu/staging_dir/bin/arm-linux-


When compiled, you will obtain 1 module and one progam:
== Driver installation==
* fpgaloader.ko: this is the driver.
Driver is installed in default Armadeus rootfs.
* fpgaregs: this is a small tool which allows accessing the FPGA from the user space without driver. This is especially usefull during development phases.


Then, you have to:
For the hackers, code is located in ''target/linux/modules/fpga/dev_tools/fpga_devtools/''.
* copy the module on your rootfs in /lib/modules/drivers/
After that you can launch:
# insmod /lib/modules/drivers/fpgaloader.ko
The default FPGA version is the spartan3 200k.
The version can be changed when installing the module (insmod /lib/modules/drivers/fpgaloader.ko 0 or 1). These informations are given by the proc interface.


== Driver usage ==
== Driver usage ==
The FPGA loader driver is usable through 1 interface:
* use /proc/drivers/fpga/loader to read the available configurations
To upload a new firmware, write:
* dd if=fpga_test.bit of=/dev/fpga/loader


== FPGARegs 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:
Write to a FPGA address
<pre class="apf">
* fpgareg addr value
# load_fpga bramtest_top_apf.bin
ex: fpgaregs 0x1000 0xabcd
</pre>
this will write 0xabcd (16bits only interface) at the FPGA internal address 0x1000
or
<pre class="apf">
# load_fpga firmware.core.rbf
</pre>


Read a FPGA address
* [[Simple_blinking_LED |  You can find some ready to use bitfiles in ''firmware/leds/blinking_led/bin/'' (blinking LED).]]
* fpgareg addr
 
ex: fpgaregs 0x1000
 
this will read the address 0x1000
 
[[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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