Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

I got almost all of my wishes granted with RP2350

dmitry.gr

Post reply on HN
Print view View original

161–170 of 356 posts

Re: I got almost all of my wishes granted with RP2350

#161

Post by spacedcowboy »

mrandish wrote: post #153
spacedcowboy wrote: post #75

Earlier quoted context omitted.

I'm seeing several statements of 2x300MHz, but the page [1] says 2x150MHz M33's.. I know the RP2040's overclock a lot but these are significantly more complex chips, it seems less likely they'll overclock to 2x the base frequency. [1] https://www.raspberrypi.com/news/raspberry-pi-pico-2-our-new...

TFA states extensive 300Mhz OC with no special effort (and he's been evaluating pre-release versions for a year). "It overclocks insanely well. I’ve been running the device at 300MHz in all of my projects with no issues at all." Also "Disclaimer: I was not paid or compensated for this article in any way. I was not asked to write it. I did not seek or obtain any approval from anyone to say anything I said. My early ac…

Thanks, I missed that.

Re: I got almost all of my wishes granted with RP2350

#162

Post by ebenupton »

moffkalast wrote: post #51
coder543 wrote: post #47

Earlier quoted context omitted.

All of the public mentions of this feature that I've seen indicated it is an either/or scenario, except the datasheet confirms what you're saying: > The ARCHSEL register has one bit for each processor socket, so it is possible to request mixed combinations of Arm and RISC-V processors: either Arm core 0 and RISC-V core 1, or RISC-V core 0 and Arm core 1. Practical applications for this are limited, since this require…

Did Dr. Frankenstein design this SoC? Igor, fetch me the cores!

It's aliiiiiive!

Re: I got almost all of my wishes granted with RP2350

#163

Post by ebenupton »

robomartin wrote: post #159
ryukoposting wrote: post #106

I can't imagine someone using an RP2040 in a real product, but the RP2350 fixes enough of my complaints that I'd be really excited to give it a shot. There's a lot going for the 2040, don't get me wrong. TBMAN is a really cool concept. It overclocks like crazy. PIO is truly innovative, and it's super valuable for boatloads of companies looking to replace their 8051s/whatever with a daughterboard-adapted ARM core. But…

For my work, the lack of flash memory integration on the 2040 is a deal breaker. You cannot secure your code. Not sure that has changed with the new device.

It has: you can encrypt your code, store a decryption key in OTP, and decrypt into RAM. Or if your code is small and unchanging enough, store it directly in OTP.

Re: I got almost all of my wishes granted with RP2350

#164

Post by ebenupton »

ravetcofx wrote: post #74
geerlingguy wrote: post #54

Earlier quoted context omitted.

Apparently (this is news to me), you can also choose to run 1+1 Arm/RISC-V, you don't have to switch both cores either/or. Eben Upton: "They're selectable at boot time: Each port into the bus fabric can be connected either to an M33 or a Hazard3 via a mux. You can even, if you're feeling obtuse, run with one of each." Source: https://www.theregister.com/2024/08/08/pi_pico_2_risc_v/

But not 2+2? That seems too bad to have each architecture run code based on their strengths for quad core workloads.

We did look at this, but the AHB A-phase cost of putting a true arbiter (rather than a static mux) on each fabric port was excessive. Also, there's a surprising amount of impact elsewhere in the system design (esp debug).

Re: I got almost all of my wishes granted with RP2350

#165

Post by 6451937099 »

TaylorAlexander wrote: post #95

This is very exciting! For the last several years I have been developing a brushless motor driver based on the RP2040 [1]. The driver module can handle up to 53 volts at 30A continuous, 50A peak. I broke the driver out to a separate module recently which is helpful for our farm robot and is also important for driver testing as we improve the design. However this rev seems pretty solid, so I might build a single board…

[dead]

Re: I got almost all of my wishes granted with RP2350

#166

Post by 15155 »

nine_k wrote: post #151
nimish wrote: post #78

Gross, the dev board uses micro-USB. It's 2024! Otherwise amazing work. Exactly what's needed to compete with the existing giants.

USB-C is way more complicated, even if you're not trying to push 4K video or 100W power through it. The interface chip ought to be more complex, and thus likely more expensive. You can still find a number of cheap gadgets with micro-USB on Aliexpress. Likely there's some demand, so yes, you can build a consumer product directly on the dev board, depending on your customer base.

How are they "way more complicated?" You have to add two resistors and short another pair of DP/DM lines?

Re: I got almost all of my wishes granted with RP2350

#167

Post by ebenupton »

formerly_proven wrote: post #109
tredre3 wrote: post #107

Earlier quoted context omitted.

Each arm/riscv set likely share cache and register space (which takes most of the die space by far), resulting in being unable to use them both simultaneously.

Considering that these are off-the-shelf Cortex-M designs I doubt that Raspi was able or would be allowed to do that. I'd expect most of the die to be the 512K SRAM, some of the analog and power stuff and a lot of it just bond pads.

That's correct. The Arm and RISC-V cores are entirely separate, sharing no logic.

Re: I got almost all of my wishes granted with RP2350

#168

Post by XMPPwocky »

ebenupton wrote: post #163
robomartin wrote: post #159

Earlier quoted context omitted.

For my work, the lack of flash memory integration on the 2040 is a deal breaker. You cannot secure your code. Not sure that has changed with the new device.

It has: you can encrypt your code, store a decryption key in OTP, and decrypt into RAM. Or if your code is small and unchanging enough, store it directly in OTP.

What stops an attacker from uploading their own firmware that dumps out everything in OTP?

Re: I got almost all of my wishes granted with RP2350

#169

Post by ebenupton »

dmitrygr wrote: post #31
jonathrg wrote: post #24

Can someone explain the benefit of having essentially 4 cores (2 ARM + 2 RISC-V) on the chip but only having 2 able to run simultaneously? Does this take significantly less die space than having all 4 available at all times?

cores are high bandwidth bus masters. Making a crossbar that supports 5 high bandwidth masters (4x core + dma) is likely harder, larger, and higher power than one that supports 3.

It's actually 10 masters (I+D for 4 cores + DMA read + DMA write) versus 6 masters. Or you could pre-arbitrate each pair of I and each pair of D ports. But even there the timing impact is unpalatable.

Re: I got almost all of my wishes granted with RP2350

#170

Post by ebenupton »

boznz wrote: post #150

> I got almost all of my wishes granted with RP2350 I got all mine, these guys really listened to the (minor) criticisms of the RP2040 on their forums and knocked them out of the ball park. Cant wait to get my hands on real hardware. Well done guys

Thank you. It's been a major effort from the team, and I'm very proud of what they've accomplished.
Post reply on HN