Building Linux SBC Around STM32 Chip

Thought for 15 mins 50 sec

The 436-ball audit is still running because the mapping must be checked ball-by-ball against ST documentation; I’m keeping the physical pad mapping unchanged while that verification completes.

Thought for 1 min 42 sec

Thought for 5 sec

Awaiting 1 background task

Thought for 5 sec

Checking Correct STM32MP257 LPDDR4 pins progress…

Thought for 7 sec

Reading Correct STM32MP257 LPDDR4 pins's report…

Thought for 10 sec — Verifying designators

Reading schematic details for DDR*.

Thought for 14 sec — Considering DDR naming conventions

Reading schematic details for CA*, CK*, CS*.

Reading schematic details for DDR_A*.

Getting a schematic overview for P*.

"STM32 LPDDR4 Pin Mapping" completed.

Thought for 9 sec

flux

I’ve reconciled the completed correction with the live part: the old DDR_Ax terminals are gone and the CA/CKE/CS mappings are present. I’m doing the final clock-pair and 436-terminal integrity check now.

Worked for 1 min 40 sec

flux

Fixed the STM32MP257FAI3 LPDDR4 pin naming issue. All 31 abstract DDR_Ax terminals were replaced with ST AN5723-aligned names for:

Channel A/B CA, CKE, and CS
Differential clocks CLKA_C/T and CLKB_C/T
Explicit LPDDR4_NC_A25 through LPDDR4_NC_A31

All 436 terminals remain present, BGA ball numbers and footprint mappings are unchanged, no DDR_Ax labels remain, and terminal review checks pass without errors or warnings. I also filed a part-quality report for engineering review.

Files

Pins

Symbol

Layout

3D View

STM32MP257FAI3