Modern CPU power-saving features (C-states) disrupt USB timing, causing the legacy controller interface on the S3C2443 side to drop packages.
To understand the driver, one must first understand the hardware it serves: Sec S3c2443x Test B D Driver
: Managed through an Advanced Microcontroller Bus Architecture (AMBA). Sec S3c2443x Test B D Driver
The driver exposes a character device with custom ioctl commands: Sec S3c2443x Test B D Driver
Modern versions of Windows (Windows 10 and Windows 11) strictly enforce 64-bit kernel-mode driver signing. Because the secbulk.sys driver for the S3C2443X was written during the Windows XP/Windows 7 era, installing it on contemporary setups requires bypassing digital signature enforcement. Step 1: Disable Windows Driver Signature Enforcement