I applied to the requisition.
Albeit, this is not the first time I have applied to a job at Apple. Even with an internal referral, the best I have ever managed over the years was a phone screening, once. Precisely 0 offers. I will cross my fingers that this application goes a bit better I suppose!
Having written as much, I already have a stack of RISC-V books from over the years and hardware too. I was stoked that OpenBSD is running on the HiFive Unmatched and that the riscv64 port is now considered officially supported, and I am hoping that the BeagleBoard Foundation will email me about production BeagleV units (preliminary samples have already been sent out to developers, but alas, I am not one of the "cool kids" I guess) given that I had much better experiences in years past with a BeagleBoard Black than I ever had with any Raspberry Pi variant. I am also looking forward to the betrusted.io Precursors I preordered last year to begin shipping next year, which though FPGA based, use a RISC-V softCPU.
Linux, GCC, golang, (O)KL4, FreeBSD, LLVM also support RISC-V targets too. In other words: a lot of the underlying tooling used by many other higher level languages and frameworks, is already primed and ready to go! I think that is exciting stuff!
As others pointed out, Micro Magic already demonstrated a 5GHz RISC-V CPU consuming merely 1W of power in 2020. I did not see mention of the 24MHz RISC-V implementation announced by ONiO.zero some time before which uses energy harvesting techniques so that it has no active power draw. Yes, there are some ARM designs which purport to use similar techniques too, but those are IP encumbered, and given how the ARM acquisition from SoftBank to NVidia seems to have stalled out, I do not take that as a good indicator for ARM based designs for others moving forward. I also did not see mention that Intel has made headlines this year for purporting to be working on their on RISC-V design, purportedly Intel even made an offer to buy SiFive, though Intel was already an early investor and I haven't seen any other headlines about such things in months.
Not to mention that while the SiFive HiFive Unmatched began shipping earlier this year which uses the "world's fastest" (I guess ignoring the Micro Magic RISC-V CPU demonstrated at 5GHz after the HiFive Unmatched and Freedom u740 cores were announced) Freedom U740 RISC-V CPUs, that is using a 28nm process from TSMC. Earlier this year, SiFive and TSMC announced that they had already created a proof of concept RISC-V iteration using TSMC's 5nm process, and I know I read elsewhere that TSMC was beginning to spin up their 2nm fabrication plant, so presumably by the time that is ready, there will be even more advanced RISC-V designs ready to take advantage of it!
Some of the other things I read in this thread kind of made me scratch my head, but maybe I have been reading too much RISC-V stuff over the years?
From my vantage: ARM is a 1980s vintage CPU ISA, and proprietary. Sure, that is great for Apple that they apparently have a perpetual license, but that is not so great for educators and implementors. Yes, M1 Apple Silicon is 64bit these days, but that is sort of like AMD64 grafts to Intel's 1970s x86 CPU ISA, rather than part of the core design. Similarly, RISC-V is from 2010 and jettisons lots of old cruft that simply is not really meaningful or applicable (I think of it as the CPU ISA equivalent to ditching floppy disk drives because now we have USB flash sticks). Vector instructions, are a default in RISC-V for example, rather than an afterthought (e.g. MMX, Neon, SSE in other CPU ISAs). Though most RISC-V cores today are 64bit, there are provisions for 128bit addressing already, and 32bit iterations, and even *gasp* some unusual 8bit and 16bit RISC-V inspired iterations (officially, RISC-V is just 32bit, 64bit and 128bit) are out there too! The fact that the entire CPU ISA is libre/free and open source, means that inventive and imaginative minds have been doing all sorts of neat things with it, I think that is a killer feature personally.
From an educators' vantage, it is wonderful that the whole thing is libre/free and open, with a lot of course work available freely online in addition to quality textbooks. Moreover there are other unusual things such as MIT's Xv6 (
https://pdos.csail.mit.edu/6.828/2019/xv6.html) is sort of a re-imagining of "Lion's Commentary on Unix" only using RISC-V instead of the IP encumbered AT&T Unix code that Lion's book was based upon. That is just one of many examples of how academia has been shifting attention to RISC-V. Not to mention, RISC-V's provenance from UC Berkeley, which begat BSD. It would be an understatement to state that macOS and iOS are BSD derived. When I consulted for iXSystems circa 2013, jkh (Jordan Hubbard) had just come on board as their CTO. Prior to that, Jordan was Director of Unix Technologies at Apple for a dozen years (apparently he felt that the culture had shifted a lot after Steve Jobs passed away, and for those who don't know: iXSystems was previously known as: BSDi, and for those who also don't know: jkh founded the FreeBSD project. He also wrote macports [previously known as darwinports]) FreeBSD and macOS are pretty heavily interconnected historically speaking. In more recent years, I think that OpenBSD code branches have been borrowed from heavily as well in macOS (e.g. LibreSSL, OpenSSH).
Western Digital has their SweRV implementation, Seagate supposedly has also begun to use RISC-V, there are also interesting RISC-V iterations such as Olof Kindgren's SERV, which he's been able to utilize to cram as many as > 5000 RISC-V cores into some higher end FPGA development boards. Even Microsoft has some RISC-V related publications going back to at least 2018.
I think if you have paid attention to NVidia's public research, even before the ARM acquisition attempt, they were already publicly discussing using 64bit RISC-V cores to replace the 32bit ARM cores in their GPUs (e.g. Joe Xie's presentation from 2016:
) and they have continued to present more recent RISC-V related research, some of it looks as if it is related to NVidia's aquisiton of Mellanox (now known as NVidia Networking, which is shipping 400Gbps Infiniband implementations for example, and Mellanox was already shipping 200Gbps ethernet implementations before they were acquired). My main guess with NVidia's attempted acquisition of ARM is that it might have reduced their operating expenses as far as licensing, but who knows. I don't work for NVidia though I did interview with them in 2016 so at least they invited me to their campus, which is more than I can claim any Apple hiring process ever managed as far as my past attempts at applications.
This is just me rambling about some of the highlights of interesting RISC-V developments. I think the GaNext Project (which is a RISC-V implementation in Gallium Nitride instead of silicon, or 1980s Cray vintage high end Gallium Arsenide circuit designs) is also fascinating, and I am sure there is a lot of other stuff I am not mentioning or may not even be hip enough to know about yet.
Regardless, Linux, FreeBSD, OpenBSD, (O)KL4, GCC, LLVM tend to have code which touches a LOT of things downstream whether or not consumers realize it, if those projects already think that RISC-V is worth having their constrained libre/free open source software developer time looking at it, then it stands to reason that it is probably worth some larger commercial entities also investing some resources. Apple isn't exactly first to the party, but they don't seem to be last either, which candidly, seems kind of par for the course for them, they've always been more of a "slow and steady" consumer friendly company rather than a bleeding edge research entity. At least from my vantage, while I did buy an M1 Apple Silicon Mac last year, and it has been nice enough and all, I was really hoping that a company with as much cash as Apple could have leapfrogged everyone and gotten a RISC-V based laptop to market first. As it stands, I am guessing the team behind the PineBook Pro might beat everyone else, since they already have the chops for a $200 64bit ARM laptop, and they have another RISC-V based product at the moment (albeit, it is a soldering iron.

) and it seems as if there is sufficient demand for their PineBooks that they are backordered! Imagine that!