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?
> > > > 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 :) 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 > > > > > > 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
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