What is going on with SafetyNet / PlayIntegrity?#

To give some context:

Android devices

Notes on Embedded development#

Notes on Yocto / OpenEmbedded#

Notes on Networking#

Terminology#

Term	Description	Notes
SFP+	Small Form-factor Pluggable (SFP)
SFI	Serial Framing Interface (SFI) enables high-speed data transmission in 10G SFP+ and 40G QSFP+ optical modules
SerDes	Serializer/Deserializer. An integrated circuit transceiver that converts parallel data into serial data for transmission, and then converts the received serial data back into parallel form
802.11X	802.1X (capital X) is a port-based network access control standard used for enterprise Wi-Fi authentication
CCK	Complementary Code Keying. A modulation scheme used in the 802.11b wireless standard to achieve data rates of 5.5 Mbps and 11 Mbps in the 2.4 GHz band.
PHY	Physical Layer. The lowest layer (Layer 1) of the OSI networking model, responsible for transmitting and receiving raw bit streams over a physical medium (like radio frequencies, copper, or fiber).
OFDM	Orthogonal Frequency-Division Multiplexing. A digital transmission method that splits a single high-speed data stream into multiple slower data streams transmitted simultaneously over many closely spaced, orthogonal subcarrier frequencies.
U.FL (MHF1/IPEX1)	Micro-coaxial RF connector used in compact devices.	Standard for the older, wider “mini PCIe” Wi-Fi cards (like the Intel 7260 or older Atheros cards)
MHF4 (IPEX4)	Even smaller micro-coaxial RF connector than U.FL.

10G / 10-Gigabit SFI/SFP+#

Intel Wi-Fi 6 AX210/AX211/AX411 160MHz (chip-ID: `8086:2725`) signal problems#

Probably caused by using U.FL instead of MHF4.

Notes on OpenWrt#

Notes on Gentoo#

How (not) to reset Thunderbolt without a reboot on Linux

October 20, 2024

2024-10

Linux, Thunderbolt, Pci

2024

Suppose you have just resumed your trusty Thinkpad T14 laptop from a suspended state and suddenly one of your displays connected to the Thunderbolt port is not working. Instead of simply rebooting and resolving the issue the easy way, we can take the opportunity to gain a bit of knowledge.

First blog post

October 18, 2024