RISC-V Linux BusyBox Single Board Notebook • Hacker News Board

Re: RISC-V Linux BusyBox Single Board Notebook

#11

Post by snvzz » Thu, Apr 09, 2026, 8:26 AM UTC

tlarkworthy wrote: post #10

snvzz wrote: post #9

Earlier quoted context omitted.

Please follow the guidelines[0] going forward. 0. https://riscv.org/about/brand-guidelines/

OK fixed! As you clearly know this space well, what do think would make this project better? I was thinking I wanted to see a heatmap of memory access (pages?), and more detailed explaination of the opcodes, but getting the thing working took quite a while so I got a bit tired and stopped at the booting milestone, but I like the project a lot and now it is in a notebook I can basically probe any part of the system wi…

This is going to be very person by person.

e.g. I'd love to see cycles spent in each mode (machine/supervisor/user). Also how much idle (wfi).

Re: RISC-V Linux BusyBox Single Board Notebook

#12

Post by tlarkworthy » Sun, Apr 12, 2026, 3:55 PM UTC

snvzz wrote: post #11

tlarkworthy wrote: post #10

Earlier quoted context omitted.

OK fixed! As you clearly know this space well, what do think would make this project better? I was thinking I wanted to see a heatmap of memory access (pages?), and more detailed explaination of the opcodes, but getting the thing working took quite a while so I got a bit tired and stopped at the booting milestone, but I like the project a lot and now it is in a notebook I can basically probe any part of the system wi…

This is going to be very person by person. e.g. I'd love to see cycles spent in each mode (machine/supervisor/user). Also how much idle (wfi).

I added a viz for that! Its cool! You can see the transition to user mode https://bsky.app/profile/larkworthy.bsky.social/post/3mjcpky...

Re: RISC-V Linux BusyBox Single Board Notebook

#13

Post by snvzz » Mon, Apr 13, 2026, 12:12 AM UTC

tlarkworthy wrote: post #12

snvzz wrote: post #11

Earlier quoted context omitted.

This is going to be very person by person. e.g. I'd love to see cycles spent in each mode (machine/supervisor/user). Also how much idle (wfi).

I added a viz for that! Its cool! You can see the transition to user mode https://bsky.app/profile/larkworthy.bsky.social/post/3mjcpky...

I love it.

In the graph, does it show the highest level of execution within the sample interval, or the current one at sample time?

Re: RISC-V Linux BusyBox Single Board Notebook

#14

Post by tlarkworthy » Mon, Apr 13, 2026, 4:38 AM UTC

snvzz wrote: post #13

tlarkworthy wrote: post #12

Earlier quoted context omitted.

I added a viz for that! Its cool! You can see the transition to user mode https://bsky.app/profile/larkworthy.bsky.social/post/3mjcpky...

I love it. In the graph, does it show the highest level of execution within the sample interval, or the current one at sample time?

It counts every instruction and blends the colours for the three active modes. Then the height represents idleness. So it's a pretty high resolution measure!