Re: [RFC PATCH v2 0/1] FPGA subsystem core

[H. Peter Anvin]

Every FPGA toolchain I know of has a way to emit JAM/STAPL bytecode files... and a fair number of programming scenarios need them.

Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx> wrote:
>On Fri, Oct 04, 2013 at 04:33:41PM -0700, Greg Kroah-Hartman wrote:
>
>> > I agree that the firmware interface makes sense when the use of the
>> > FPGA is an implementation detail in a fixed hardware configuration,
>> > but that is a fairly restricted use case all things considered.
>> 
>> Ideally I thought this would be just like "firmware", you dump the
>file
>> to the FPGA, it validates it and away you go with a new image running
>in
>> the chip.
>
>That is 99% of the use cases. The other stuff people are talking about
>is fringe.
>
>I've been doing FPGAs for > 10 years and I've never once used read back
>via the config bus. In fact all my FPGAs turn that feature off once
>they are loaded.
>
>Partial reconfiguration is very specialized, and hard to use from a
>FPGA design standpoint.
>
>I also think it is sensible to focus this interface on simple SRAM
>FPGAs, not FLASH based stuff, or whatever complex device required a
>byte code interpreter (never heard of that before).
>
>Jason

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