To diagnose power issues, "hang on logo" errors, or charging failures, you need precise schematics. You can find detailed E7A MB PCB V3 wiring diagrams on Scribd , which illustrate: Component Identification : Maps for capacitors, resistors, and BGA chips. Signal Paths
set CHIPNAME e7a source [find target/armv7m.cfg] e7a mb pcb v3 link