“Salomon saith,
There is no new thing upon the earth.
So that as Plato had an imagination,
that all knowledge was but remembrance;
so Salomon giveth his sentence,
that all novelty is but oblivion.” ― Francis Bacon, The Essays

Hello, this is a web place about myself.

While I am an embedded Linux software engineer professionally, my technical background is in Control Systems engineering and Renewable Technologies. Most of my interests and skills are in technical fields, but I am passionate about economics, entrepreneurship, history, philosophy, film and photography, design, and maybe even architecture…

Most of my work relates to Open Source software so I give talks at conferences. Check out my CV in the sidebar for more information.

This is a place where I can let all my interests, experiences, and thoughts, be laid bare.

What am I working on, publicly?#

• Experimenting with local LLMs on VRAM-constrained hardware

  • Petrina, J. (2026, July). jpetrina/Qwen3.6-27B-MTP-IQ4_XS-pure-GGUF
  • https://github.com/spiritbuun/buun-llama-cpp/pull/67
  • buun-llama.cpp-hip, rocmfp4-llama.cpp-git

• Rockchip Neural Processing Unit (rknpu)

  • OEM SDK: https://github.com/airockchip/rknn-toolkit2
  • FOSS solution:
    • Vizoso, T. (2025, July). Rockchip NPU update 6: We are in mainline!
    • Vizoso, T. (2025, July 21). [PATCH v9 00/10] New DRM accel driver for Rockchip's RKNN NPU. linux-rockchip.
    • Mohan, A. (2025, December 11). Reverse-engineering the RK3588 NPU: Hacking memory limits to run vision transformers.

• Rockchip Image Signal Processing (rkisp)

  • Omnivision OV5647 and OV13850 cameras
  • Rockchip Auto Image Quality (rkaiq) daemon
    • JeffyCN/mirrors @ rkaiq-2025_08_11/rkaiq/RkAiqManager.cpp#L202
  • CMOS sensor -> MIPI CSI-2/D-PHY -> RK3576 VICAP -> RKISP -> V4L2 /dev/videoX -> GStreamer v4l2src -> encoder/display

• Yocto on Rockchip RK3576

  • JeffyCN/meta-rockchip#167: Error applying patch onto gstreamer1.0-plugins-bad-1.24.12-r0
  • JeffyCN/meta-rockchip#159: Issue with linux-rockchip and Perl

Recent publications#

In January, 2026 I gave a talk at FOSDEM 2026 in Brussels, Belgium titled:

Review of kernel and user-space Neural Processing Unit (NPU) chips support on Linux

The presentation was part of the “AI Plumbers” devroom and it was about AI acceleration ASICs with a focus on reviewing Linux software stacks for AI/ML training and inference on various platforms.

In May, 2024 I gave a talk titled:

Production-line automation of hardware testing using Robot Framework​,

at DORS/CLUC 2024, Zagreb, Croatia. It focused on my semi-automated solution for testing a custom OpenWrt-based network device after it has been manufactured.

… you can also take a look at my older publications.

Interesting events in 2026:#