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Yep I did receive my prototype and have been starting to work on the boot process to make sure the device boots up nice and easy. Current boot process is a bit rocky. I’m also working on my build system now that I have something to test with to make it as easy as possible for any of you guys...

That’s likely!

That’s weird I’m not. The repo is public so should be ok. I’ve changed the link to just point at the repo not the commit maybe that will be better I guess.

Yes after my research into the OMAP5 this seems to be the simplest option. What’s important is the exact documentation for how to do this. It’s not exactly obvious for someone unaware, especially because each SOC expects different offsets, programs headers, etc. aTc currently has a script on our...

Yep I plan on creating a good amount of documentation. I really want all of these processes to be easy and available to encourage development by those less experienced. Pyra is a perfect platform to learn. I can make quicker progress on this once I get hardware to test with, and my hardware is...

Didn’t think this conversation could fall further off the rails but it did :)

Yes, but in this case we wouldn’t use a full file system. Just an initramfs which is small enough to be loaded into RAM. The initramfs is only loaded with the necessary tools. This is a pretty standard way to flash via USB/serial. Load the bootloader into RAM via USB/serial and send over a...

This should be doable also, there’s hardware logic to boot from the microSD by holding one of the shoulder buttons.

The eMMC can be flashed a variety of ways. A simple way is to load uboot and a kernel into ram and flash it this way. Often this process will be handled over USB, but I believe the Pyra will load from a tester OS booted from SD. The OS will boot from an SD, run a script to test the hardware, and...

I possibly can. I’ll have to sort some stuff out in finding a carrier that won’t cost me an arm and a leg for just enough data for testing.

It was not sarcastic :)

I’ve solved this issue before on different modems in Android. Should be straightforward. The fact that it comes up quick in Letux tells me it’s really just a configuration issue. @EvilDragon when you say it comes up in Letux in 10s, do you mean on a different device (one of @hns others) or on...

Ok great so then this will be something I can work on too.

@EvilDragon does the modem need any work done? I remember someone mentioning the connection time is pretty slow for the modem, but I haven’t seen it for myself. If so, does my dev unit have a modem installed?

Also very very unlikely getting any Pi SOC to boot with custom hardware. They are very closed source (RPi foundation keeps it that way) and extra effort into making sure the BSP can’t be repurposed. I’m not sure about the 4, but previous RPis use an obfuscated boot process involving the GPU in...

Agreed. There is also so much more than raw core metrics as it also heavily depends on vendor implementation. Furthermore SOC parameters and available bandwidth have a huge effect as well. The image posted is merely eye candy. I highly recommend reading the article. Speaking of which. Do we...

It’s much easier to just make up numbers :) Unfortunately there’s no final metrics in here for the 28nm process, but the article I linked does give a really interesting overview of what was done to make improvements to the A72 core from the A57. The A57 itself hosts improvements over the A15. I...

Bringing this back. I agree that better process will give better performance. However, accessibility is a big issue here. Powerful (enough) chips being built on these improved processes are pretty expensive and difficult to source. You typically need to be a big name purchasing large...

Yes of course. I’ll be compiling as much of this information as I can into a hacking/customization guide on the Wiki that explains boot process, how to modify it, how to modify the OS, how to contribute, etc. I’m currently populating a README in the build system repository as I don’t seem to...

Yep, as long as there’s a driver in U-Boot, it can boot from it. Any of the devices are bootable (not positive about USB but I’m pretty sure), it’s just a matter of configuration. Sounds like U-Boots already configured to check in a couple spots by default. If you want to do something specific...