Kontron COMe Ref. Carrier T2 - Manual (Page 50)

COM Express™ miniBaseboard Type 2 / Connectors and Features
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5.16 External BIOS
Both miniBaseboards support external boot. By closing Jumper J69 on both baseboards the module's onboard BIOS is
disabled and the system will boot from an external Firmware Hub in U43 PLCC socket on baseboard's bottom side.
For modules supporting SPI boot the COM Express™ miniBaseboard Type 2 provides a SPI socket J80 for an optional
available SPI Flash. SPI is part of COM.0 Specification Rev 2.0 and external SPI boot can be enabled by closing Jumper
J82. Please check the documentation of your module if SPI is supported and which SPI Flash is required.