Am Montag 22 Juni 2009 11:17:34 schrieb André Schwarz:
On Mon, 2009-06-22 at 11:00 +0200, Dieter Kiermaier wrote:
André,
Dieter,
On Mon, 2009-06-22 at 08:19 +0200, Dieter Kiermaier wrote:
André,
Dieter,
On Fri, 2009-06-19 at 17:46 +0200, Dieter Kiermaier wrote:
Hello List,
I want to boot a (Lattice) FPGA from u-boot by using Slave Serial configuration on a Marvell Kirkwood device.
Should be no problem as long as you'll have access to GPIO.
I'm working on it :) But more likely I would have the SPI controller to do the serializing of the bitstream. But maybe this would be the second step.
Bitbanging is not critical and works pretty fast. You definitely have to control maximum frequency and observe errors during load. If you'll use SPI make sure to disconnect the bus from the FPGA and keep the config pins in a sane state.
Do you have some time values how long your FPGA needs to boot by using bitbanging?
less than a second.
Thats fine!
As seen there is an (Xilinx and Altera) FPGA loader driver allready available in u-boot. Please can somebody explain how I have to provide a FPGA bitstream image to u-boot?
The easiest way is to reserve some unused flash sectors and use the first sector's start adress as arg for "fpga load".
I assume this will only work with NOR flash, right?
I'm using NOR flash, but it will work with any adressable memory.
If I'm using NAND flash I have to copy the image to ram first?
yes.
It seems I have to create a image with mkimage?
you can store e.g. fpga.bin as a single file inside jffs, read it and load your fpga.
no - Lattice specififc bitstream can be stored in raw format. mkimage may be useful for update, but personally I prefer update via dedicated linux mtd partition.
This image have to be loaded into ram and the address has to be provided to the load command?
Usually an FPGA is *very* board specific. I'd suggest to use flash and create a corresponding mtd partition for linux, i.e. make it maintainable.
Seems to be a good way.
yes - but not for jffs2 on NAND. You can use a plain binary file instead.
Is there a cmd in u-boot to read a file from a jffs2 filesystem inside a nand flash partition?
Have a look at the end of common/cmd_jffs2.c : fsload is the one for you.
Thanks for that link :)
Is there a maintainer for the FPGA code inside u-boot? I'm willing to contribute some extensions for Lattice FPGAs if I'm successful!
excellent - all you'll need is the Lattice specific bit toggle sequence.
submitting a proper patch will surely do.
I'm trying to get an idea what place is the best to integrate the lattice architecture in to the fpga framework. If I have any further questions - can I ask you again?
of course, but since I'm a PowerPC user I can't tell anything specific to ARM ...
Thanks again!
So I would try to bring it up and see what happens :)
yes - to get it done quickly I'd recommend to add a new Lattice device family. Please create e.g. drivers/fpga/lattice.c and lattice_ecp3.c (matching your device) according to the xilinx and altera templates. It will integrate into common/cmd_fpga.c smoothly.
GPIO accessor functions have to be defined inside the board specific code. If you definitely want to use spi please do it there, i.e. *not* in the general code unless this is useful for all boards.
You can have a look at board/matrix_vision/mvbc_p/fpga.c+h
Ahh, thats what I want to hear. This will save much time to figure it all out. Sorry, but I'm a newbie compared with all these experts here. So what is clear for everybody isn't clear for me (at least until now...) But hopefully this becomes better :)
Many thanks! Cheers, Dieter
Regards,
André
Dieter
Cheers,
André
Regards,
André
Many thanks for helping, Dieter
Thanks to all, Dieter _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
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MATRIX VISION GmbH, Talstrae 16, DE-71570 Oppenweiler Registergericht: Amtsgericht Stuttgart, HRB 271090 Geschftsfhrer: Gerhard Thullner, Werner Armingeon, Uwe Furtner, Hans-Joachim Reich
MATRIX VISION GmbH, Talstra�e 16, DE-71570 Oppenweiler Registergericht: Amtsgericht Stuttgart, HRB 271090 Gesch�ftsf�hrer: Gerhard Thullner, Werner Armingeon, Uwe Furtner, Hans-Joachim Reich