Tootfinder

FPGA people: how cursed is it if I scramble TX/RX lanes of my transceivers so that e.g. TX lane 0 and RX lane 1 go to a single SFP28?
They're separate clock domains anyway, separate PLL taps. I'm not using the CPLL so that's no factor.
It feels wrong, but I can't think of any reason why it would be? (I've done this before and it worked fine but that was with hacky breakout to SMA setups, not by design on a PCB)

My JS Krups is resisting netbooting. I see it doing a DHCP discover, and I see Kea responding with an offer, but then it just sends another Discover. Hmph. I can get to the serial console and doing boot net from there doesn't help; none of the keyboard shortcuts for network diag etc seem to work (except the one that displays the help for it...). So I took the flash SIM out and now it boots to Net rather than flash by default; alas with the same DHCP behaviour. Time to try isc-dhcp.…

This https://arxiv.org/abs/2406.03965 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csDB_…

More Bang For Your Buck(et): Fast and Space-efficient Hardware-accelerated Coarse-granular Indexing on GPUs
In recent work, we have shown that NVIDIA's raytracing cores on RTX video cards can be exploited to realize hardware-accelerated lookups for GPU-resident database indexes. On a high level, the concept materializes all keys as triangles in a 3D scene and indexes them. Lookups are performed by firing rays into the scene and utilizing the index structure to detect hits in a hardware-accelerated fashion. While this approach called RTIndeX (or short RX) is indeed promising, it currently suffers from…

This https://arxiv.org/abs/2506.03023 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

TDCOSMO 2025: Cosmological constraints from strong lensing time delays
We present cosmological constraints from 8 strongly lensed quasars (hereafter, the TDCOSMO-2025 sample). Building on previous work, our analysis incorporated new deflector stellar velocity dispersions measured from spectra obtained with the James Webb Space Telescope (JWST), the Keck Telescopes, and the Very Large Telescope (VLT), utilizing improved methods. We used integrated JWST stellar kinematics for 5 lenses, VLT-MUSE for 2, and resolved kinematics from Keck and JWST for RX J1131-1231. We …

Who got RX DQS calibration done with success? 👀

🇺🇦 #NowPlaying on #BBC6Music's #CerysMatthews
Gwenno:
🎵 Utopia - 6 Music Session - RX 06/07/25
#Gwenno

Upgraded to an AMD Radeon RX 9070 XT GPU recently, just in time for the latest stable Linux firmware to be wonky with an amdgpu. Oh well, I'm accustomed to the song and dance of downgrading / pulling git branches for stability on #linux, and dabbling with the pro drivers.
And yes, that 4TB mount point is for

are you a platform/embedded developer?
do you need to interact with hardware in a semi-custom manner?
would you like to suffer a lot less doing it?
if so, #GlasgowInterfaceExplorer might be for you. the code below is all you need to build a custom testbench for a DUT you've never seen before. just as easily you can add JTAG/SWD debug, protocol analyzers, etc.…

TDCOSMO 2025: Cosmological constraints from strong lensing time delays
Simon Birrer, Elizabeth J. Buckley-Geer, Michele Cappellari, Frederic Courbin, Frederic Dux, Christopher D. Fassnacht, Joshua A. Frieman, Aymeric Galan, Daniel Gilman, Xiang-Yu Huang, Shawn Knabel, Danial Langeroodi, Huan Lin, Martin Millon, Takahiro Morishita, Veronica Motta, Pritom Mozumdar, Eric Paic, Anowar J. Shajib, William Sheu, Dominique Sluse, Alessandro Sonnenfeld, Chiara Spiniello, Massimo Stiavelli, Sher…

TDCOSMO 2025: Cosmological constraints from strong lensing time delays
We present cosmological constraints from 8 strongly lensed quasars (hereafter, the TDCOSMO-2025 sample). Building on previous work, our analysis incorporated new deflector stellar velocity dispersions measured from spectra obtained with the James Webb Space Telescope (JWST), the Keck Telescopes, and the Very Large Telescope (VLT), utilizing improved methods. We used integrated JWST stellar kinematics for 5 lenses, VLT-MUSE for 2, and resolved kinematics from Keck and JWST for RX J1131-1231. We …

🇺🇦 #NowPlaying on #BBC6Music's #CerysMatthews
Gwenno:
🎵 Y Gath - 6 Music Session - RX 06/07/25
#Gwenno

But I owe a duty to Ireland:
I held her honour in my hand,
This lovely land that always sent
Her writers and artists to banishment
And in a spirit of Irish fun
Betrayed her own leaders, one by one.
James Joyce, Gas From a Burner (1912)
http://www.ricorso.net/rx/library/authors/classic/Joyce_J/Poetry/Gas_Burn.htm

🇺🇦 #NowPlaying on #BBC6Music's #CerysMatthews
Gwenno:
🎵 Baby, I'm Broke - 6 Music Session - RX 06/07/25
#Gwenno

Finished the picolibc 1.8.10 release this morning. Learning from my mistakes, I did a bunch more testing with Zephyr to try to avoid breaking that build. https://github.com/picolibc/picolibc/releases/tag/1.8.10

i've upgraded the Ethernet controller applet for #GlasgowInterfaceExplorer
this is the main loop of the applet working in bridge mode (acting as a network card for your PC). no weird optimizations, no hacks, just a loop that forwards packets in normal boring Python
on a 100BASE-T link, i get ~95.5 Mbps [saturated link] of upload bandwidth and ~70 Mbps of downlo…