Most plausible interpretation: exynos usb device 4000 hot → An Exynos-based USB device is (hotplug loop) and is recognized with a VID/PID containing 4000 (e.g., 04e8:4000 is Samsung’s USB vendor ID + common PID for Exynos bootloader/UART mode).
Working on a bench with multiple power supplies (e.g., a powered hub and an external DC adapter for the Exynos board) can create ground potential differences. This causes intermittent USB resets. The “hot” message is the kernel’s way of saying the device vanished and reappeared. exynos usb device4000 hot
Despite the name, "USB Device4000" usually does not refer to a flash drive or peripheral you have plugged in. In the context of Samsung’s Exynos chipsets, this refers to the . Most plausible interpretation: exynos usb device 4000 hot
Based on the technical phrase provided, this appears to be a log message or system alert regarding the Samsung Exynos processor managing a USB device (specifically the USB 3.0 controller, often mapped at address 4000 ), where the thermal sensor indicates the device is running "hot." The “hot” message is the kernel’s way of