[GTALUG] Question Fodder - RISC-V

[Stewart Russell]

Though I couldn't make tonight's session, I know that the ST-Link
programmer appears as a /dev/St.? (stlink0, maybe?). It's not a TTY or
storage device. There are many clones available for pennies.

Yeah, I've had the misfortune of being stuck with some "Blue Pill"
controller boards that have bad USB ports, so had to resort to ST-Link.

Stewart

On Tue., May 14, 2019, 17:39 Christopher Browne via talk, <talk at gtalug.org>
wrote:

> I'm bringing in a sample of the Sipeed Tang Primer chip, which is a RiscV
> on a wee board.
>
> Picture attached.
>
> Poke a MicroUSB cable into the port at the end, and see some
> Blinkenlightzen.
>
> I have had only very limited success with a "Hello World" (see the
> following web site; it's got good material, possibly dated, but
> nevertheless specific...  https://justanotherelectronicsblog.com/?p=470)
>
> It appears the FPGA may be programmed via the built-in USB port; I
> downloaded latest edition of Tang Dynasty FPGA programmer app, and pulled
> the code for the RISC-V; it appears to have been optimizing routing for a
> couple of weeks now without reaching completion, which makes me suspicious
> that something may not be working ;-)
>
> http://tang.lichee.pro/get_started/fpga_download.html
>
> I have built some apps using a suitable GCC target compiler, but again,
> some lack of success deploying code.  That needs an STLink32 "JTAG"
> programmer, which I have recently had hooked up, but with a lack of success
> at getting Linux box to talk to it.  There is some confusion as to whether
> I should be seeing /dev/ttyUSB1 or discovering some filesystem-like device
> (perhaps MTP) that I'd talk to.  Supposedly, I should be able to upload a
> whole image consisting of Linux, init.d, and some set of tools that can
> boot and run and be talked to via a TTY talking to /dev/ttyUSB1 (or perhaps
> something else).
>
> At any rate, a wee box with a Sipeed Tang and a couple of sets of long
> pins to help work with it will be coming in tonight, and if anyone is keen
> on playing with it, I'm happy for it to have
> it head to someone interested.
> ---
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