Viewing profile — dougg3

Very cool that you worked on the OMAP3 and BeagleBoard! I didn't ask anybody else about it. I just decided to tinker with my USB sniffer to try to get to the bottom of what was goi…

That's a really excellent point. I will do that!

Thank you! Hopefully it works for you. I guess I should reword the way I said something in the previous message: when I said "it can force the monitor to always be detected", I rea…

Yeah, if you are 100% confident you're using your GPU's I2C controller it's probably fine, but the reason I warned about it repeatedly in the post was because I stumbled upon this …

I also have a couple of passthroughs -- I probably should have mentioned them in the post as another option. The one I have is fancy -- it can read the EDID from a monitor, save it…

That’s what that was? I noticed it while looking through the Apple HD SC Setup code and assumed it had something to do with A/UX, but had no idea. Good to know!

Another option, if you can’t find a card, is a ZuluSCSI or BlueSCSI V2 in initiator mode to image the drive to an SD card. It’s pretty nifty! I’ve recently even been using ZuluSCSI…

There are indeed some aluminum electrolytics hiding on Quantum drives. They look sneakily like tantalum caps, but they're just cans hiding inside a plastic cover. Here's one where …

It also appears that I may not have been the first one to discover that something odd was going on with that bit, causing it to use A0-A7 (with weird results) instead of D0-D7: htt…

Don't you think, as a Mac ROM developer, the chances of your software bug being accidentally fixed by the CPU through an undocumented instruction are pretty low? That's what I was …

I’ve been trying it out a bunch lately. From what I’ve seen, machines with Egret don’t have it enabled by default, but machines with the newer Cuda do.

My test of an 040 (no A1 change, D1 changed) was on a chip with the following markings: XC68LC040RC25B 02E23G QEDP9348D MALAYSIA

Thank you! Yes, I will definitely make another post if and when someone figures out what the instruction does.

On the 040, it seems to do something that actually involves D1. Definitely doesn't touch A1 at all. I didn't test further, but it's possible it just handles the instruction as a no…

Author here. Yeah, I have a tendency to go into pretty big deep dives when I find stuff like this. It's so rewarding at the end, even if it does take a lot of time!

Ha! Guilty as charged. I have a coworker who's probably very disappointed in me right now!

To be fair, other non-cosmetic stuff uses the CPU percentage. This same bug was preventing fast user suspend on the OLPC until they worked around it. It was also a fun challenge.

Author here. Thanks! I believe the register reads are just extending the delay, although the new approach does have a side effect of reading from the hardware multiple times. I don…

Thanks! I wouldn't want to write it any other way. I think it helps convey just how much work it really was.

I'm the author of this article and you're absolutely correct! This was a long, drawn-out project. For some context, I ordered the replacement regulators in February. The new LED dr…

It lets you see the raw underlying packets like IN, OUT, SETUP, DATA0/1, etc. That capability would be most useful for USB device firmware developers who might want to see these pa…

Larry’s work on maintaining a bunch of Realtek’s vendor drivers on GitHub was huge for a lot of the community. Even today these forks often work much better than the mainline drive…

Sorry, I somehow missed your comment until now. Didn't get any notifications. I tend to do it more like what you first said, mocking low-level calls. I typically put all hardware-s…

This is a really impressive project! It was a fun read. Thanks for sharing! I like this writing style. > As an aside, I try to create a dual-target build for all my embedded projec…

Hi, I’m the author of this post. I’m not aware of a similar Pico project that acts as an Altera USB Blaster clone. Seems like an interesting project idea though! The CH552 firmware…