BBB cape EEPROM and FDT overlays

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Matwey V. Kornilov

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Jul 9, 2019, 1:43:46 PM7/9/19

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Hi,

There exists cape expansion EEPROM format [1]. However, currently only first 250 bytes are in use. The question is the following. Is it possible to extend this format to allow storing FDT overlay for the particular cape? Then u-boot could read the overlay and patch the main board FDT.

Alternatively, u-boot could recover the used peripheral via the "Pin usage" field and then enable devices using board_fix_fdt()

[1] https://elinux.org/Beagleboard:Cape_Expansion_Headers#Cape_EEPROM_Contents

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