Most people care about if it’s on a list of vms to buy on AWS.

It took amazon a ~decade to get graviton to something worth using.

(XCP-ng founder here)

I'm more optimistic for RISC-V. For all the devs who worked on it here (at https://vates.tech), they told me it's very easy to work with since it's close to many Arm design principles.

That's why I believe it's important to prepare the platform today for those future machines. I think it's a great opportunity to not only get an alternative both x86 and Arm, but also really opening the choice of the design, letting new players mastering both hardware and software (I have to admit that's something I'm considering for my business at some point).

I think just a lot of the open source community and even ARM itself assumed there would be some inflection point at which point everyone would jump ship to RISC-V. I could be wrong, but at this point it seems more likely to be a gradual change unless there is some key gamechanger piece of hardware like the M1 chip

Most of the big moves in the RISC-V space seem to be coming from the low-end and from China. They might have trouble making the jump to a true x64 M1-like competitor given the geopolitics with cutting edge chip manufacturing (TSMC etc.)

I think other players are going to have funding issues to take on the big players as the open nature of RISC-V seems to mean it's harder to build an IP moat. I've noticed a lot of the Chinese chips come with stuff like NPUs to set themselves apart and presumably get some lock in on their "platforms". But that's just my naiive impression reading some blogs and looking at releases. (ie. I have no idea what I'm talking about)

I don't think it will be "instant change". I agree on the gradual result, but I think it might be faster than we think. Yes, it also depends on the ecosystem, but I think the world is more ready for ISA diversity than ever.

>I think just a lot of the open source community and even ARM itself assumed there would be some inflection point at which point everyone would jump ship to RISC-V. I could be wrong, but at this point it seems more likely to be a gradual change unless there is some key gamechanger piece of hardware like the M1 chip

I don't know why. It's not inherently better than any of the current architectures in meaningful way, just doesn't require license.

IIRC royalty per ARM chip was somewhere in single digit percentages which is basically meaningless for everyone but the chip company, or few big companies making super low margin stuff.

the expensive part of an arm license isn't the money, it's the fact that you have to deal with it (and be highly reliant on a 3rd party that doesn't share your interests).

Unless you design RISC-V core yourself that doesn't change with RV. Still need to find someone that will license you core (remember, ISA is the free part, not implementation).

I guess if using one of the open cores is enough in your use case that would make it easier.

it also means what you know you can switch vendors without rewriting code. you need to license the core, but you have options on who to license it from.

I’m interested to hear what you think the structure of the market for licensed RISC-V cores will be. How many vendors will there be and where will the revenue to support all these vendors will come from? At the moment licensing cores is not a massively lucrative business.

I don't know, but it seems likely to me that it should be able to sustain a few companies. All the really high end stuff will probably be first party developed (e.g. by NVidia) and not sold to 3rd parties, but there are a lot of places where flexibility is more important than raw performance. It's possible that market will be fulfilled by open source cores, but I wouldn't be surprised if there are some medium sized companies that make a business out of 3rd party custom chip design.

QEMU is probably the most used, most powerful non-embedded RISC-V platform today. If a customer really wants RISC-V for server applications, it's probably the fastest way to do this today- it seems we're still pretty far from server-grade RISC-V silicon.

>it seems we're still pretty far from server-grade RISC-V silicon.

Ventana Veyron's just that, and meant to ship before 2023 ends.

These are not good for day to day use like raspberry. It will take a bit but at the end the ISA will matter.

There have been way better options since almost the beginning in terms of design/arch/boarddesign than RPi with their weird VCore monster. Nobody has displaced them in like a decade. I doubt a change of architecture is the final push needed

I can buy a RISC-V board, I can't buy a Raspberry PI.

That is actually starting to change, and per Eben Upton’s very recent interview with Jeff Geerling, should be approaching back to normal for hobbyists in coming months.

I’ve checked rpilocator a few times this week to find 4Bs available every single time. Not tons and not everywhere, but they’re starting to have availability again.

ISA will not matter. Features and how well it works out of the box will.

rPi have hundreds of competitors and they still sell by far the most amount of SBCs, because "it just works" with many things supporting it out of the box

The provenance of the ASUS Tinker V units is Taiwan and Japan?

I wonder whether they'll embrace open firmware and mainline Linux (including all drivers) for the entire board.

That's what I really want from RISC V offerings. (Though I understand the current motivation of many with RISC V is simply to avoid ARM licensing fees, and that having trustworthy and long-term sustainable hardware usually isn't a requirement in IoT.)

Don't hold your breath. They've had a incredibly disappointing track record with Tinkerboards. Taiwan and Japan .. have a horrible record with open source as far as I can tell? (I can't think of any counterexamples right now)

It's based on a bad chip that violates the privileged spec, by having a hardware pinned TLB entry. On a really bad memory location that breaks standard Linux userspace.

It will never be able to run standard distributions, only bespoke for the device.

Categorically avoid, and hope the next generation Renesas chip is less dumb.

> the uptake has been slow. Turns out, while cool to hear about, most people at the end of the day don't really care about what architecture they're running.

Price is a factor. €140 for the Lichee which "nearly catches up with standard ARM board performance like Raspberry Pi 4" (their own words from the AliBaba page) is hard to justify for most, especially since this also comes with less mature ecosystem support. The $90 Pine64 is cheaper but also slower than a RPI4 and Pine64 is a "by enthusiasts, for enthusiasts" type of deal, which means stuff like 30-day warranty (which is a fine, just not a good fit for many uses). There is no price for the Asus one yet, but it's a lot slower than a RPI and judging from their other boards I bet it's going to be a lot more expensive.

And price's supposed to be reason to move.

The whole industry's buzz about RISC-V is pretty much "yay, we don't need to pay ARM for license".

the price will take time and volume. to me risc-v is interesting largely because of how well thought out their vector instruction set is. it really shows the advantage you get when you are the last one to implement a feature and can see how everyone else messed it up.

Well, yeah, but not something someone would buy CPU for unless said CPU with vector extensions is faster or more energy efficient than competition.

Next year will have Tenstorrent's (CEO: Jim Keller) Ascalon, led by Wei-han Lien, who also led the M1 project at Apple, and expected to have similar IPC as projected Zen5 (also TBA 2024) but using significantly less power.

It has a range of smaller variants, potentially able to cover a range of products including servers, laptops and smartphones.

Economies of scale.

If a shift happens it would start gradually until a tipping point, then everyone will move so fast it will make your head spin.

Looking at how open source has eaten the proprietary software vendors, I imagine RISC V to follow the same path.

> Looking at how open source has eaten the proprietary software vendors

It has but mainly only in areas where adopting it allows cutting costs and is not the end product itself. Not sure why/how could that work for chips. Why would you give out your core designs for free to anyone?

Why would you give away your software source code free to anyone? (See rocketchip)

Lots of riscv implementations are closed source though

>(See rocketchip)

Also see XuanTie C910, open-source yet competitive with Cortex-A73, been available for years.

Meanwhile, Eben Upton has been falsely claiming that no such cores are available for licensing.

> Lots of riscv implementations are closed source though

Exactly. Which potentially can make it worse than ARM, making it impossible for new players to enter the market at some point. Catching up would require massive investment and you can't just buy a competitive design of the shelf (looking at ARMs business model licensing your designs to other is just not a good deal and they are effectively still a monopoly in certain segments)

> It has but mainly only in areas where adopting it allows cutting costs and is not the end product itself.

That's a lot of areas for RISC-V.

It doesn't matter to the end user if the end product (Phones, Tablets, TVs, routers, Home automation gadgets, etc) has ARM or RISC-V.

On the desktop, the end-user may care about whether their software still works, and as such the ISA matters.

In appliances, which is where ARM is dominating, the end user's don't care about whether they can run their existing spreadsheets, or powerpoint, or games, or other software that won't be ported. They only care about whether the device is still as usable as their previous device.

If end users cared at all about the ISA, ARM would never have taken off for phones, tablets, etc.

In this space (that ARM is dominant in), the ISA isn't the end-product; the device is.

> It doesn't matter to the end user if the end product (Phones, Tablets, TVs, routers, Home automation gadgets, etc) has ARM or RISC-V.

Yes but it's not about the end users and it matters for the producers. I mean if your core designs are 'open' and anyone can make just as good chips as you what are you competing on? It means you have no margins since you're selling a commodity, which means there is no incentive into investing anything into R&D (unless it allows you to cut production costs).

> In this space (that ARM is dominant in), the ISA isn't the end-product; the device is.

So all new chips will have to be designed in-house by the companies which make these devices (effectively eliminating 'middle-men' like Qualcomm, Intel, AMD etc.) so nobody is really competing on CPUs, since core design can no longer be part of your core business (the same way everyone is using Linux, Android, Blink/Chromium)? Wouldn't that lead to stagnation?

I don't really see this happening with hardware, though. Especially not high-end chips as long as you can gain a significant advantage by keeping your designs proprietary and all 'open' cores are not protected by something equivalent to GPL (which realistically would be very hard to enforce)

That doesn't mean the ecosystem is mature though. How many chips support RVA22?

Uh, "none", because the ratified version of RVA22 was published on April 2, 2023, less than two months ago?

We'll probably see the first boards with SoCs supporting RVA22 in the first half of 2024.

The SoC IP used in ASUS's Tinker V deliberately violates the virtual memory spec in a way that affects userspace, rendering certain virtual addresses unusable. This region overlaps with the default base address of position-dependent executables, so those cannot and will not run on it unless rebuilt with a different explicit base address.

It still feels like a broken mess on my Starfive Vision2, but things are improving. I just think I'm not developer brained enough to fix the rough edges. Debians repo's are still missing a lot of riscV ported software but that takes time.

My experience with VF2 has been great. I love the standard RISC-V boot process. My board runs Arch from NVMe.

The weakest link seems to be the GPU driver (Imagination Technologies), as it is proprietary and not very good.

We know they are working on a mesa3d driver, but I am not sure it will cover the GPU variant used in the VF2 SoC.