Code signing In the IPQ50xx chipsets, the PBL only allows images that are signed with software type 0 (SBL) and type 3 (device programmer). This restriction disables other images that are presented to the PBL for authentication. The software image
Frequently asked questions Can I use non-secure software on a secured chip? Never. Always use signed images to boot up. Otherwise, the download mode is entered as PBL fails to boot up because of an authentication failure. Does secure boot
2PD and fine search In most cases, 2PD finds the focus position without the need for a fine search. However, in some challenging scenes the FV from the fine search is used to locate the final focus position. This behavior
To tune AF speed, it is important to understand the issues and trade-offs that affect AF speed. Identify the major cause of the speed setback before making changes.
AF test procedures This chapter describes the procedures for testing or verifying various aspects of the tuning process. Enable full-sweep search and AF core logging Enable AF core logging Capture images at predefined lens positions Capture images at current manual
AF tuning considerations It is important to know the factors that affect tuning. This section describes the impact and trade-offs of various hardware and tuning dependencies. Tuning dependency Descriptions Hardware dependencies Actuator type (opened-loop vs. closed-loop) Closed-loop actuator typically yields
The 3A debug information visualization feature allows you to review 3A values from the EXIF data associated with a specified JPEG file.
AF tuning use cases This chapter describes common AF issues. The root causes of most AF problems are not trivial. One issue might have different solutions. CAF triggering is too sensitive and triggers too easily while slowly panning CAF triggering
Actuator range test This test checks the boundary range at macro and infinity. It checks if there is enough range for the lens to move so that it can focus on macro/infinity objects. Setup Place the ISO 12233 resolution chart
Actuator settle time This test checks if the lens settles once the lens movement command is issued by checking the focus value consistency at the same lens position for multiple frames. Setup Place the ISO 12233 resolution chart 30 cm