glasgow VS pclk-mn10

This post is so timely!

Does anybody in this thread have details about the H-UDI proprietary SH4 JTAG extensions? Context here:

https://github.com/GlasgowEmbedded/glasgow/discussions/290

Hmm. A followup question: are there any cheats/hacks that would make it possible (if painful) to for example explore the world of USB3, PCIe, or Linux on low-end-ish ARM (eg https://www.thirtythreeforty.net/posts/2019/12/my-business-c..., based on the 533MHz https://linux-sunxi.org/F1C100s), without needing to buy equipment in the mid-4-figure/low-5-figure range, if I were able to substitute a statistically larger-than-average amount of free time (and discipline)?

For example, I learned about https://github.com/GlasgowEmbedded/glasgow recently, a bit of a niche kitchen sink that uses https://github.com/nmigen/nmigen/ to lower a domain-specific subset of Python 3 (https://nmigen.info/nmigen/latest/lang.html) into Verilog which then runs on the Glasgow board's iCE40HX8K. The project basically makes it easier to use cheap FPGAs for rapid iteration. (The README makes a point that the synthesis is sufficiently fast that caching isn't needed.)

In certain extremely specific situations where circumstances align perfectly (caveat emptor), devices like this can sometimes present a temporary escape to the inevitable process of acquiring one's first second-hand high-end oscilloscope (fingers-crossed the expensive bits still have a few years left in them). To some extent they may also commoditize the exploration of very high-speed interfaces, which are rapidly becoming a commonplace principal of computers (eg, having 10Gbps everywhere when USB3.1 hits market saturation will be interesting) faster than test and analysis kit can keep up (eg to do proper hardware security analysis work). The Glasgow is perhaps not quite an answer to that entire statement, but maybe represents beginning steps in that sort of direction.

So, to reiterate - it's probably an unhelpfully broad question, and I'm still learning about the field so haven't quite got the preciseness I want yet, but I'm curious what gadgetry, techniques, etc would perhaps allow someone to "hack it" and dive into this stuff on a shoestring budget? :)

Project GitHub: https://github.com/GlasgowEmbedded/glasgow

(Not to make it about me but there is more knowledge lurking in my repository that's not in the command list, sadly neglected. I keep meaning to add support for multi-part commands so that track / display updates can be handled properly as per https://github.com/4gra/pclk-mn10/discussions/5 -- I'll get there one day. The way I see it one has to take the long view to still be in minidisc...).

No need. I'm software developer. Look Control A1 and PC-Link are standard infrared protocols over wire. And it is described here: http://www.hifi-remote.com/sony/Sony_dsp.htm , working computer software library here: https://github.com/4gra/pclk-mn10