View source for FPGA loader

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

== Module compilation & installation==
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:
 # 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:
* fpgaloader.ko: this is the driver. 
* 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:
* 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 ==
The FPGA loader driver is usable through 1 interface:
 # /proc/drivers/fpga/loader read the available configurations
To upload a new firmware, write:
 # dd if=fpga_test.bit of=/dev/fpga/loader

== FPGARegs usage ==
Write to a FPGA address
* fpgareg addr value 
 # fpgaregs 0x1000 0xabcd
this will write 0xabcd (16bits only interface) at the FPGA internal address 0x1000

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