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It's a productivity killer if nothing else.Īnyway, I did have a spare (and sufficiently modern) PC for the PicoEVB at hand, but I still needed an adapter from M.2 2230 Key A/E to PCIe x1.
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Imagine it's late Tuesday night, you're trying to wrap your head around a particular issue and your workstation crashes for the third time in a row during a test and each time you have to start all over again, twiddling your thumbs, thinking about what went wrong, until Vivado is ready again-not to speak of the joy when manual recovery is necessary. I've been involved in the implementation of two DMA designs in my career and I can tell you first-hand that even the pros mess up (from time to time -)).Įven if you're lucky and don't lose any changes, it can be utterly frustrating and kill your morale pretty quickly. Then you have to reboot, fsck your hard drives (and hope for the best), and while trying to restore your session you discover that you've lost the last 5 minutes of work. in the implementation of your DMA engine, the FPGA will gradually clobber main memory until it hits something vital, giving you just enough time to realize what's going down before the system freezes or crashes. So when you make just the tiniest of mistakes e.g. The thing is that the FPGA, via PCI Express, has access to the entire (physical) address space of its host, including kernel space. I remember this being mentioned in some blog post way back when I first started looking into this kind of stuff, and I strongly recommend you follow this advice, too (at least for the time being). and one "dumb" secondary host with the eval board (whichever it would be) plugged in to do the actual live testing on.
Well, it was clear to me from the beginning that I would have a setup with two boxen, one main workstation for development & simulation etc. (Now I do wonder about those shipping fees though!?)īut there's still the unusual (for an eval board that is) M.2 form factor. Placed the order, and 5 (!) days later a small parcel arrived from some Mouser facility in Munich, Germany. Sample project, Linux drivers, various open source utilities all available.ĬrowdSupply offer was $219 + $25 shipping to Germany.
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It's supported by Vivado's free WebPACK edition and Enjoy-Digital's open source LiteX framework and LitePCIe in particular probably also Symbiflow.
There just wouldn't be that much to evaluate, I thought.įor evaluating/prototyping PCI Express designs, the board does have everything that's needed at least to get started: An FPGA flash memory a built-in USB JTAG "cable" a PCI Express interface, of course and a couple of LEDs. I have to admit that I was rather judgemental of the board, mostly because of the unusual M.2 2230 form factor and the obvious scarcity of I/Os, connectors, anything. So I started searching the Web and stumbled upon the PicoEVB. I was looking for a Xilinx kit specifically, and one that is also supported by Enjoy-Digital's open source LitePCIe project ("a small footprint and configurable PCIe core powered by Migen & LiteX") because I'd like to be able to experiment with these "new-fangled" HDLs, too (eventually).Īt work we have an AC701 evaluation kit from Xilinx, also with an Artix-7, but I didn't bother asking if I could borrow it because it's quite expensive ($1.295) and I'd be constantly worried not to damage the thing. The best thing about this is that you can get it starting at just $199 + shipping! This post gives an overview of the hardware setup I arrived at using the PicoEVB development board with a Xilinx Artix 7 FPGA and a PCIe x1 Gen 2 host interface. So I've been meaning to play with FPGAs and PCI Express for such a long time already now and, in light of some recent events, I decided that it's about time to finally take action.
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