Difference between revisions of "FPGA loader"
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(→FPGARegs usage) |
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Write to a FPGA address | Write to a FPGA address | ||
* fpgareg addr value | * fpgareg addr value | ||
− | + | # fpgaregs 0x1000 0xabcd | |
this will write 0xabcd (16bits only interface) at the FPGA internal address 0x1000 | this will write 0xabcd (16bits only interface) at the FPGA internal address 0x1000 | ||
Read a FPGA address | Read a FPGA address | ||
* fpgareg addr | * fpgareg addr | ||
− | + | # fpgaregs 0x1000 | |
this will read the address 0x1000 | this will read the address 0x1000 |
Revision as of 11:26, 9 December 2006
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