Alchitry FPGA support?

[kallisti5]

The guys who made the Mojo v3 FPGA (awesome FPGA for beginners at a low cost around the Spartan 6 XC6SLX9) are coming out with two new boards:

• https://alchitry.com/collections/all/products/alchitry-au
  • Artix 7 XC7A35T-1C - 33,280 logic cells
  • 256MB DDR3 RAM
  • Closed-source toolchain
• https://alchitry.com/collections/all/products/alchitry-cu
  • iCE40-HX8K FPGA - 7680 logic elements
  • No DDR3 :-(
  • Open-source toolchain via icestorm

The Cu is a lot more interesting since it uses the open-source icestorm toolchain.. that would mean a nearly 100% open source implementation of a RISC-V processor on FPGA. I'm not sure the iCE40-HX8K has enough logic elements for a RISC-V core though... and it's lack of DDR is a bit limiting. (nothing says they won't offer a DDR add-on board like on the Mojo though.)

I'm pretty sure the Au has enough space for the RISC-V though... thoughts?

[jrrk]

I see no mention of Ethernet, video or non-volatile storage. This will limit the peripheral capabilities severely. Also the 7A35T is much smaller than a 7A100T. I would suggest the ArtyA7-100T at $249 might be a better investment. However if you don’t need 64-bits or caches much smaller designs are possible such as the RV32 which uses more of a micro controller type of architecture.

https://store.digilentinc.com/arty-a7-artix-7-fpga-development-board-for-makers-and-hobbyists/

Sent from my iPhone

On 9 Dec 2018, at 15:10, Alex von Gluck IV [email protected] wrote:

The guys who made the Mojo v3 FPGA (awesome FPGA for beginners at a low cost around the Spartan 6 XC6SLX9) are coming out with two new boards:

https://alchitry.com/collections/all/products/alchitry-au Artix 7 XC7A35T-1C - 33,280 logic cells https://alchitry.com/collections/all/products/alchitry-cu iCE40-HX8K FPGA - 7680 logic elements The Cu is a lot more interesting since it uses the open-source icestorm toolchain.. that would mean a nearly 100% open source implementation of a RISC-V processor on FPGA.

I'm not sure the iCE40-HX8K has enough logic elements for a RISC-V core though... thoughts?

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