RE: The Spec. Sheets for Privileged and Unprivileged...
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Mala Dies
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Jan 24, 2021, 1:41:50 AM1/24/21
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to BeagleV
Hello,
I have been reading the unprivileged specification sheet. Is this RISC-V spec. sheet for unprivileged use a warning of what not to do?
Seth
P.S. I am on Chapter Two and working through it slowly. I will get to the shorter, privileged spec. sheet soon. If anyone here knows of what I am describing, please share, yell, or empower my mood towards the BeagleV.
Drew Fustini
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Jan 24, 2021, 2:07:13 AM1/24/21
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to Mala Dies, BeagleV
The SiFive U74 cores in the StarFive SoC implement RV64GC. The core
also implements the privileged spec which allows it to run a full OS
like Linux where there is a distinction between M-mode (machine mode)
and S-mode (supervisor mode). I recommend checking out this talk
about SBI: https://www.youtube.com/watch?v=jstwB-o9ll0 SBI is the
interface between the bare-metal mode and the OS kernel.
Also, while the specifications can be useful to read, I highly
recommend the RISC-V Reader:
http://riscvbook.com/
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Hello...thank you. I appreciate your quick reply. I will look over the links to better associate BeagleV w/ RISC-V specs. and the SBI.
I am glad you all are paying attention to new set up chips for your open source platforms.
Seth
P.S. Although I may never use one in real time w/ machinery or machine learning or AI (etc), my hobby has brought me this far. I plan on keeping it. If I am not picked to test the hardware/software, I will stay patient for the community testing board to populate the national stores. I basically started when the BBB 2GB versions came out. I was a couple years late on in that respect. "There is always catch up work to perform."
Mala Dies
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Feb 5, 2021, 7:37:41 PM2/5/21
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to BeagleV
Hello,
I just got my hands on the RiscVBook. Thank you.
Seth
P.S. There is nothing like advancing before the actual release date. Oh and I found on the #beagle channel on Freenode that there is a U74 chip on the board you all are producing w/ StarFive and Seeed and it has a datasheet. phew...here it is: SiFive U74 Manual: 20G1.03.00 (prismic.io) .
Anyway, the more I read and the more I configure things, the more support I can provide to this BeagleV support. So, w/out further ado, off to look up the other resources and peripherals on the board.
On Sunday, January 24, 2021 at 1:07:13 AM UTC-6 drew wrote:
Mala Dies
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Feb 5, 2021, 7:47:14 PM2/5/21
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It seems there are many, different cameras one can purchase to handle this tech. "The more, the merrier!"
Seth
Mala Dies
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Mar 15, 2021, 11:41:34 PM3/15/21
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to BeagleV
Hello Mr. Drew,
Seth here. I found some nice articles, well .pdf files, and some video w/ a 'well known' communication person. He discusses busybox, buildroot, and other things like QEMU for adapting Linux in 45 minutes, give or take, on RISC-V.
The fellow even talks about the BeagleV and what it may offer for a bit.