mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Hardware

Reply
 
Thread Tools
Old 2020-10-30, 12:13   #1
Xyzzy
 
Xyzzy's Avatar
 
"Mike"
Aug 2002

5·112·13 Posts
Default RISC-V

https://www.techpowerup.com/274024/r...elopment-board

https://www.sifive.com/boards/hifive-unmatched



https://en.wikipedia.org/wiki/RISC-V
Quote:
Unlike most other ISA designs, the RISC-V ISA is provided under open source licenses that do not require fees to use.
Attached Files
File Type: pdf HiFive Unmatched Product Brief (released).pdf (662.6 KB, 8 views)
Xyzzy is offline   Reply With Quote
Old 2020-10-30, 14:22   #2
M344587487
 
M344587487's Avatar
 
"Composite as Heck"
Oct 2017

3×233 Posts
Default

It's a good step, but RISC-V is still many years from being viable in a consumer chip. That board is for evaluation and jumpstarting dev efforts and is still a few orders of magnitude off price-wise. No one's stepped up and mass-produced a design for consumer adoption yet, that may not be realistic anytime soon because the majority of consumers require an iGPU and unless I'm out of the loop that looks to be a bit of a problem.
M344587487 is offline   Reply With Quote
Old 2020-10-30, 15:23   #3
Mark Rose
 
Mark Rose's Avatar
 
"/X\(β€˜-β€˜)/X\"
Jan 2013

55458 Posts
Default

I was looking at that yesterday, and it's nice they finally have a useful desktop board. It would be fun to run that as a novelty.


Last fiddled with by Mark Rose on 2020-10-30 at 15:25
Mark Rose is offline   Reply With Quote
Old 2020-10-30, 18:04   #4
xilman
Bamboozled!
 
xilman's Avatar
 
"π’‰Ίπ’ŒŒπ’‡·π’†·π’€­"
May 2003
Down not across

1039310 Posts
Default

[borat]Very nice[/borat]

Last fiddled with by xilman on 2020-10-30 at 18:21
xilman is offline   Reply With Quote
Old 2020-11-09, 12:55   #5
Xyzzy
 
Xyzzy's Avatar
 
"Mike"
Aug 2002

5×112×13 Posts
Default

https://www.mouser.com/new/sifive/sifive-hifive/
Xyzzy is offline   Reply With Quote
Old 2020-11-09, 13:42   #6
paulunderwood
 
paulunderwood's Avatar
 
Sep 2002
Database er0rr

5·701 Posts
Default

Quote:
Originally Posted by Xyzzy View Post
At Β£515.31 what is the advantage of this board other than openness?

I have ordered a Sipeed Longan Nano RISC-V GD32VF103CBT6 for Β£6.70 in order to play with the RISC-V instruction set. It supports RV32IMAC instruction set.

Last fiddled with by paulunderwood on 2020-11-09 at 15:17
paulunderwood is online now   Reply With Quote
Old 2020-11-14, 18:14   #7
Xyzzy
 
Xyzzy's Avatar
 
"Mike"
Aug 2002

1EB916 Posts
Default

Quote:
Originally Posted by paulunderwood View Post
At Β£515.31 what is the advantage of this board other than openness?
It looks like fun!

Other kinda-related news: https://riscv.org/blog/2020/11/picor...er-for-risc-v/
Xyzzy is offline   Reply With Quote
Old 2020-11-14, 22:39   #8
paulunderwood
 
paulunderwood's Avatar
 
Sep 2002
Database er0rr

5×701 Posts
Default

Quote:
Originally Posted by paulunderwood View Post
I have ordered a Sipeed Longan Nano RISC-V GD32VF103CBT6 for Β£6.70 in order to play with the RISC-V instruction set. It supports RV32IMAC instruction set.
Ahead or the delivery of my Sipeed Longan Nano, I have started programming a RISC-V assembly code library for arbitrary precision arithmetic as a basis of doing some speudoprimaility tests. I have written array_add and array_mul so far -- though I need the device for debugging purposes.

The tools I am using are Visual Studio Code with the PlatformIO plug-in which deals with uploads to the Longan Nano.

I found some easy to follow learning material on the net, including YouTube,

Last fiddled with by paulunderwood on 2020-11-14 at 22:42
paulunderwood is online now   Reply With Quote
Old 2020-11-23, 10:50   #9
paulunderwood
 
paulunderwood's Avatar
 
Sep 2002
Database er0rr

5·701 Posts
Smile

My Longan Nano arrived today. Now I can start debugging my arbitrary arithmetic code. I have a RISC-V book on order -- the one with a picture of Mona Lisa on the front.

Edit: I now need a usb-c cable. Also for another Β£3 I could have got a LCD display and a case
Attached Thumbnails
Click image for larger version

Name:	1606127587059.JPG
Views:	21
Size:	36.6 KB
ID:	23835  

Last fiddled with by paulunderwood on 2020-11-23 at 12:39
paulunderwood is online now   Reply With Quote
Old 2020-11-24, 10:52   #10
LaurV
Romulan Interpreter
 
LaurV's Avatar
 
Jun 2011
Thailand

22·2,239 Posts
Default

Quote:
Originally Posted by paulunderwood View Post
My Longan Nano arrived today. Now I can start debugging my arbitrary arithmetic code. I have a RISC-V book on order -- the one with a picture of Mona Lisa on the front.

Edit: I now need a usb-c cable. Also for another Β£3 I could have got a LCD display and a case
Ha! That board is just a $3-$4 "-ino" board, many vendors have. We use similar toys from STM in our daily job. You can PM us your address and we can send you few. Don't expect a lot of performance, haha, I mean I know that Risc-V is about 10% to 15% "innate" faster than Cortex-M (i.e. clock per clock), and that the core consumption in run mode could be about a half, to a third, of a Cortex-M core, depending on what you do with it, but the peripherals (timers, etc) inside are the same, and at the end, this is just a board running at 48MHz or so, so you can't do much with it. Next step would be to put together 960 of them and give them TF work (in such a way, for a given p and bitlevel, each will work a single class of k's from the 960 classes). They will consume about 30 mW per chip, which is about 28 Watt, and if you make 10 such contraptions, you will get the performance of an average-to-high-end GPU, for the same power consumption. Except, this will cost you to build (at ~$0.6 per chip if you buy large qty) about $6000.

Last fiddled with by LaurV on 2020-11-24 at 10:54
LaurV is offline   Reply With Quote
Old 2020-11-24, 11:37   #11
paulunderwood
 
paulunderwood's Avatar
 
Sep 2002
Database er0rr

5·701 Posts
Default

Thanks for the offer, but I want to concentrate on RISC-V for now -- that is complicated enough! I like the way every thing is open, with architecture diagrams etc. I will be reading my RISC-V book and debugging my code when the usb-c cable arrives.

Last fiddled with by paulunderwood on 2020-11-24 at 11:37
paulunderwood is online now   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
RISC-V ewmayer Hardware 4 2019-10-26 18:02
Mlucas on HP-UX/PA-RISC setup question smoky Mlucas 14 2009-05-05 15:40

All times are UTC. The time now is 06:51.

Wed Dec 2 06:51:53 UTC 2020 up 83 days, 4:02, 1 user, load averages: 1.19, 1.46, 1.50

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.