Building Linux SBC Around STM32 Chip

flux

Here is the complete 12-column grid (including NB entries) for K4F6E3S4HM-MGCJ, rows A–AB and columns 1–12.
Csv
Row,Col,Signal
A,1,DNU
A,2,DNU
A,3,VSS
A,4,VDD2
A,5,ZQ
A,6,NB
A,7,NB
A,8,NC
A,9,VDD2
A,10,VSS
A,11,DNU
A,12,DNU
B,1,DNU
B,2,DQ0_a
B,3,VDDQ
B,4,DQ7_a
B,5,VDDQ
B,6,NB
B,7,NB
B,8,VDDQ
B,9,DQ15_a
B,10,VDDQ
B,11,DQ8_a
B,12,DNU
C,1,VSS
C,2,DQ1_a
C,3,DMI0_a
C,4,DQ6_a
C,5,VSS
C,6,NB
C,7,NB
C,8,VSS
C,9,DQ14_a
C,10,DMI1_a
C,11,DQ9_a
C,12,VSS
D,1,VDDQ
D,2,VSS
D,3,DQS0_t_a
D,4,VSS
D,5,VDDQ
D,6,NB
D,7,NB
D,8,VDDQ
D,9,VSS
D,10,DQS1_t_a
D,11,VSS
D,12,VDDQ
E,1,VSS
E,2,DQ2_a
E,3,DQS0_c_a
E,4,DQ5_a
E,5,VSS
E,6,NB
E,7,NB
E,8,VSS
E,9,DQ13_a
E,10,DQS1_c_a
E,11,DQ10_a
E,12,VSS
F,1,VDD1
F,2,DQ3_a
F,3,VDDQ
F,4,DQ4_a
F,5,VDD2
F,6,NB
F,7,NB
F,8,VDD2
F,9,DQ12_a
F,10,VDDQ
F,11,DQ11_a
F,12,VDD1
G,1,VSS
G,2,ODT_CA_a
G,3,VSS
G,4,VDD1
G,5,VSS
G,6,NB
G,7,NB
G,8,VSS
G,9,VDD1
G,10,VSS
G,11,DNU
G,12,VSS
H,1,VDD2
H,2,CA0_a
H,3,NC
H,4,CS_a
H,5,VDD2
H,6,NB
H,7,NB
H,8,VDD2
H,9,CA2_a
H,10,CA3_a
H,11,CA4_a
H,12,VDD2
J,1,VSS
J,2,CA1_a
J,3,VSS
J,4,CKE_a
J,5,NC
J,6,NB
J,7,NB
J,8,CK_t_a
J,9,CK_c_a
J,10,VSS
J,11,CA5_a
J,12,VSS
K,1,VDD2
K,2,VSS
K,3,VDD2
K,4,VSS
K,5,DNU
K,6,NB
K,7,NB
K,8,DNU
K,9,VSS
K,10,VDD2
K,11,VSS
K,12,VDD2
L,1,NB
L,2,NB
L,3,NB
L,4,NB
L,5,NB
L,6,NB
L,7,NB
L,8,NB
L,9,NB
L,10,NB
L,11,NB
L,12,NB
M,1,NB
M,2,NB
M,3,NB
M,4,NB
M,5,NB
M,6,NB
M,7,NB
M,8,NB
M,9,NB
M,10,NB
M,11,NB
M,12,NB
N,1,VDD2
N,2,VSS
N,3,VDD2
N,4,VSS
N,5,DNU
N,6,NB
N,7,NB
N,8,DNU
N,9,VSS
N,10,VDD2
N,11,VSS
N,12,VDD2
P,1,VSS
P,2,CA1_b
P,3,VSS
P,4,CKE_b
P,5,NC
P,6,NB
P,7,NB
P,8,CK_t_b
P,9,CK_c_b
P,10,VSS
P,11,CA5_b
P,12,VSS
R,1,VDD2
R,2,CA0_b
R,3,NC
R,4,CS_b
R,5,VDD2
R,6,NB
R,7,NB
R,8,VDD2
R,9,CA2_b
R,10,CA3_b
R,11,CA4_b
R,12,VDD2
T,1,VSS
T,2,ODT_CA_b
T,3,VSS
T,4,VDD1
T,5,VSS
T,6,NB
T,7,NB
T,8,VSS
T,9,VDD1
T,10,VSS
T,11,RESET_n
T,12,VSS
U,1,VDD1
U,2,DQ3_b
U,3,VDDQ
U,4,DQ4_b
U,5,VDD2
U,6,NB
U,7,NB
U,8,VDD2
U,9,DQ12_b
U,10,VDDQ
U,11,DQ11_b
U,12,VDD1
V,1,VSS
V,2,DQ2_b
V,3,DQS0_c_b
V,4,DQ5_b
V,5,VSS
V,6,NB
V,7,NB
V,8,VSS
V,9,DQ13_b
V,10,DQS1_c_b
V,11,DQ10_b
V,12,VSS
W,1,VDDQ
W,2,VSS
W,3,DQS0_t_b
W,4,VSS
W,5,VDDQ
W,6,NB
W,7,NB
W,8,VDDQ
W,9,VSS
W,10,DQS1_t_b
W,11,VSS
W,12,VDDQ
Y,1,VSS
Y,2,DQ1_b
Y,3,DMI0_b
Y,4,DQ6_b
Y,5,VSS
Y,6,NB
Y,7,NB
Y,8,VSS
Y,9,DQ14_b
Y,10,DMI1_b
Y,11,DQ9_b
Y,12,VSS
AA,1,DNU
AA,2,DQ0_b
AA,3,VDDQ
AA,4,DQ7_b
AA,5,VDDQ
AA,6,NB
AA,7,NB
AA,8,VDDQ
AA,9,DQ15_b
AA,10,VDDQ
AA,11,DQ8_b
AA,12,DNU
AB,1,DNU
AB,2,DNU
AB,3,VSS
AB,4,VDD2
AB,5,VSS
AB,6,NB
AB,7,NB
AB,8,VSS
AB,9,VDD2
AB,10,VSS
AB,11,DNU
AB,12,DNU
Note: ODT_CA_a and ODT_CA_b carry footnote “1)” in the datasheet indicating they are wired to Rank 0 ODT(CA) pads; other ranks’ ODT(CA) pads (if present) are disabled in the package.
Want me to attach this CSV to the project or proceed to place and wire this DRAM relative to the MPU for x32 routing?
Add row/col labels
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Verify NB vs NC
Export only signals
Generate pin map JSON

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STM32MP257FAI3 Part Review
Source
Current Flux project state
  • Project name: STM32MP257FAI3
  • Schematic: 436 Terminal components, no nets.
  • BOM: no BOM part entry present.
  • Layout: 436 pads, 1 footprint, 1 model, 2 containers, 2 lines, 3 text objects.
  • Metadata update made: project Implementation Details now records the official datasheet URL. A component-level Datasheet URL property was not available because the project is modeled as a part/footprint with terminals, not as a normal schematic component instance.
Key datasheet/product specs

Table

ItemDatasheet / official product information
ManufacturerSTMicroelectronics
MPNSTM32MP257FAI3
StatusActive / volume production
PackageTFBGA436, 18 x 18 x 1.2 mm, 0.8 mm pitch
Ball / pin count436
GradeIndustrial
RoHSEcopack2
Main coresDual Arm Cortex-A35 up to 1.5 GHz; Arm Cortex-M33 up to 400 MHz; Cortex-M0+ in SmartRun domain up to 200 MHz
Memory interfaceExternal DDR up to 4 Gbytes; DDR3L-2133, DDR4-2400, LPDDR4-2400 support
Internal SRAM808 Kbytes
I/OUp to 172 secure I/O ports
InterfacesEthernet, FDCAN, I2C, I3C, LPUART/UART/USART, PCIe, SAI, SPI, SPDIFRX, USB, LVDS/DSI/CSI, DDR
Supply range noted by product page1.71 V min, 3.6 V max; multiple I/O supply sections include 1.71-1.95 V and 2.7/3.0-3.6 V domains
TemperatureJunction/industrial range -40 to 125 °C
Symbol / terminal cross-check
  • Terminal count matches datasheet ball count: 436 schematic terminals vs. 436 TFBGA balls.
  • Sampled terminal pin numbers match datasheet ball definitions:
    • PA7: project Y14; datasheet TFBGA436 Y14; I/O TT.
    • PA9: project T12; datasheet TFBGA436 T12; I/O TT.
    • PF0: project V12; datasheet TFBGA436 V12; I/O TT.
    • PI11: project G1; datasheet TFBGA436 G1; I/O TT.
    • DDR_A2: project N16; datasheet TFBGA436 N16; output DDR.
  • The project includes expected special/power/high-speed terminals from the datasheet family, including VDDCORE, VDDCPU, VDDGPU, VDDQDDR, VSS, VDDA18* supplies, BOOT0-BOOT3, NRST, PWR_ON, USB, PCIe, DSI/CSI/LVDS, DDR, and JTAG/SWD terminals.
Footprint cross-check
  • Layout pad count matches datasheet ball count: 436 pads.
  • Package form matches expected TFBGA436 part family by count and footprint object presence.
  • Mechanical dimensions and pitch should still be visually/geometry-verified against ST package drawing: TFBGA436, 18 x 18 x 1.2 mm, 0.8 mm pitch. The current inspection data exposed pad count but not enough pad coordinate detail to prove the exact 18 mm outline / 0.8 mm pitch.
Mismatches / gaps flagged
  1. Pin descriptions are missing: all inspected schematic terminals are Terminal parts with Pin Type: Unspecified; no per-pin Pin Description from the datasheet is populated.
  2. Symbol is not represented as a single MPU symbol: it is modeled as 436 independent terminals. This can be valid for a Flux part/footprint project, but it means normal component-level symbol review is not possible the same way it would be for a schematic IC instance.
  3. BOM has no part entry, so MPN/manufacturer/package metadata is not available through the BOM. The information exists in the project name/description, but not as a standard BOM item.
  4. Datasheet URL could not be written to a normal component Datasheet URL field because there is no component instance representing the MPU; it was recorded in project Implementation Details instead.
  5. The layout summary reports copper layer count as 0. If this part project is only a symbol/footprint library item, that may be acceptable; if it is meant to be a board, stackup/layer setup is incomplete.
Recommendation
  • Add or generate pin-level descriptions/types from datasheet Table 11 for all 436 terminals.
  • Add explicit part metadata fields where the library part system supports them: Manufacturer Name = STMicroelectronics, Manufacturer Part Number = STM32MP257FAI3, Package or Case Code = TFBGA436 18x18x1.2 P0.8, Datasheet URL = official ST PDF.
  • Verify footprint geometry against the ST package drawing, not just pad count.

  • Source

  • Current Flux project state

  • Key datasheet/product specs

  • Symbol / terminal cross-check

  • Footprint cross-check

  • Mismatches / gaps flagged

  • Recommendation

Documents

  • STM32MP257FAI3 Part Review

Assets

stp

STM32MP257FAI3.stp

3D_STM32MP257FAI33D Model
STM32MP257FAI3-thumb.png

STM32MP257FAI3-thumb.png

STM32MP257FAI3-thumbThumbnail
kicad_mod

BGA436C80P22X22_1800X1800X120.kicad_mod

FP_BGA436C80P22X22_1800X1800X120Footprint
STM32MP257FAI3

STM32MP257FAI3

STM32MP257FAI3 Symbol.svgDefault

STM32MP257FAI3

STM32MP257FAI3 thumbnail
MPU with Dual Arm Cortex-A35 @1.5GHz, Cortex-M33 @400MHz, 3xEthernet (2+1 switch), 3xFD-CAN, LVDS/DSI, H.264, 3D GPU, AI/NN, Secure Boot, Cryptography, DRAM enc/dec, PKA
The STM32MP257FAI3 is a high-performance microprocessor from STMicroelectronics' STM32MP2 series, integrating dual 64-bit Arm Cortex-A35 cores running at up to 1.5 GHz, a Cortex-M33 real-time core, and a Cortex-M0+ low-power management core. It is designed for advanced industrial, edge AI, machine vision, HMI, IoT gateway, and multimedia applications requiring Linux-class processing alongside deterministic real-time control. The device features AI acceleration, 3D graphics, video encoding/decoding, extensive connectivity, advanced security, and support for high-speed external memory.
Key Features Dual-core 64-bit Arm Cortex-A35 CPU operating up to 1.5 GHz Arm Cortex-M33 real-time processor with TrustZone and FPU support Arm Cortex-M0+ low-power coprocessor for autonomous operation Integrated NPU (Neural Processing Unit) delivering up to 1.35 TOPS AI performance 3D GPU and hardware video encoder/decoder acceleration Supports DDR3L, DDR4, and LPDDR4 external memory up to 4 GB Multiple display interfaces including MIPI-DSI, LVDS, and parallel RGB USB 2.0 Host and USB 3.0 Dual-Role with embedded PHYs PCI Express interface with integrated 5 Gbps PHY Up to three Gigabit Ethernet interfaces with TSN and IEEE 1588 support Extensive connectivity: I2C, I3C, SPI, UART, USART, CAN FD, SDMMC, SAI, and SPDIF Hardware cryptographic accelerators including AES, SHA, RSA, ECC, PKA, and True RNG Secure boot, TrustZone security, tamper detection, and resource isolation framework Multiple low-power operating modes for energy-efficient designs Available in fine-pitch BGA packages for high-density embedded systems.
#STM32MP257FAI3 #STM32MP2 #STMicroelectronics #CortexA35 #CortexM33 #EdgeAI #EmbeddedLinux #IndustrialAutomation #MachineVision #HMI #IoTGateway #MPU #PCIe #USB3 #GigabitEthernet #TrustZone #EmbeddedSystems #ArtificialIntelligence #LinuxProcessor #IndustrialIoT #CommonPartsLibrary #IntegratedCircuit #Microprocessor #STM32MP2

Properties

Official datasheet: https://www.st.com/resource/en/datasheet/stm32mp257f.pdf

STMicroelectronics

IC

st.com/resource/en/datasheet/stm32mp257f.pdf

STM32MP257FAI3

BGA436C80P22X22_1800X1800X120

Integrated Circuit

creativecommons.org/licenses/by/4.0/

parametric-v1

Pricing & Availability

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