Viewing profile — ebenupton

Cortex-M33 timings aren't documented, but one of our security consultants has made a lot of progress reverse engineering them to support his work on trace stacking for differential…

It's a fair comment. Give our VSCode extension a go: the aspiration is to provide uniform developer experience across Linux, Windows, and MacOS.

Yes, several approaches. More here: https://x.com/ghidraninja/status/1821570157933912462

Signed boot. Unless someone at DEF CON wins our $10k bounty of course.

Significant improvements to flat-out power (switcher vs LDO) and to idle power (low quiescent current LDO for retention). Still not a coin-cell device, but heading in the right dir…

Thank you. It's been a major effort from the team, and I'm very proud of what they've accomplished.

It's actually 10 masters (I+D for 4 cores + DMA read + DMA write) versus 6 masters. Or you could pre-arbitrate each pair of I and each pair of D ports. But even there the timing im…

That's correct. The Arm and RISC-V cores are entirely separate, sharing no logic.

We did look at this, but the AHB A-phase cost of putting a true arbiter (rather than a static mux) on each fabric port was excessive. Also, there's a surprising amount of impact el…

It has: you can encrypt your code, store a decryption key in OTP, and decrypt into RAM. Or if your code is small and unchanging enough, store it directly in OTP.

It's aliiiiiive!

It is true ROM.

As did Graham Sanderson, whose Easter egg this is.

It is. Both from ( https://direct.raspberrypi.com ), and from various disties. Just shy of 300ku on hand at Farnell today ( https://uk.farnell.com/search?st=rp2040 ).

No - the Model A is still 256MB.

And an additional 256MB (512MB versus 256MB for the Model A).

That's not correct. The code that's been released is for BCM21553, which doesn't have a VPU. There are bits and pieces of VPU assembler in there, but they're unused on the ARM targ…

You're most welcome. Good times.

Figured you'd get a kick out of this release. Should be enough for people to figure out how Andrew's FFT code works.

The ability to boot a kernel with USB (and thus Ethernet) running. Probably not display in the first instance (we're hella-resource-constrained), but we'd want to add that later on…

Fancy meeting you here :)

BSD-like licenses seem to be the standard for userland graphics libraries. There's a lot of useful stuff in there (for example the shader compiler) that may be of general use elsew…

Fingers crossed. I'm most excited about the GPGPU stuff people will be able to do now we've documented the instruction set for the QPU. More on this next week.

:)

I did work on it directly. James (now working solely for Pi as HW director), Gordon (now working solely for Pi as SW director) and I (still working for Broadcom, and for Pi) were m…