Define what "Early Signs of Life" is and what component is responsible

Prior to the OS taking control of the display, there is a requirement to show some sort of graphics as quickly as possible to indicate to the user the system is powered on and booting. Some T-Con vendors help with this requirement by providing a mechanism to embed a bitmap in their FW that is displayed as soon as power is applied.

This task is asking for a decision: Is this T-Con support something we should standardize on?

If no, it will allow low-cost platforms to stick with low-cost panels, but the delay from power button press to image will be much longer.

If yes, we have an opportunity to remove all graphics code from the UEFI to simplify and speed up the boot and we could enhance the early image display feature to allow the EC to select images like low battery or thermal errors without the need to power on the SOC.

Start with the issue's discussion of T-Con firmware, UEFI, the EC, and the SoC. Compare the two proposed approaches and identify which component should own the early display behavior. Done means the governance decision and component responsibility are explicitly recorded; no file or test is identified in the issue.