MicroPython Forum (Archive)

a) create a partition table for that 8 MB flash and place it in the esp32 directory. The name is arbitrary. I named it partitions_8mb.csv. My copy:

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# Name,   Type, SubType, Offset,  Size, Flags
# Note: if you change the phy_init or app partition offset, make sure to change the offset in Kconfig.projbuild
nvs,      data, nvs,     0x9000,  0x6000,
phy_init, data, phy,     0xf000,  0x1000,
factory,  app,  factory, 0x10000, 0x1F0000,
vfs,      data, fat,     0x200000, 0x600000,

b) create a board definition subdirectory for that board. That could be a copy of the most similar board. I called it GENERIC_SPIRAM_8MB. But you can give it any suitable name. That name is used in the make command and in the changed mpconfigboard.cmake (see below).
c) create a file sdkconfig.board in the board directory which sets the flash size and partition table name. My version:

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CONFIG_ESPTOOLPY_FLASHSIZE_8MB=y
CONFIG_PARTITION_TABLE_CUSTOM=y
CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions_8mb.csv"

c) change the mpconfigboard.cmake file in adding the name of the sdkconfig.board file. Mine looks as follows after the change:

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set(SDKCONFIG_DEFAULTS
    boards/sdkconfig.base
    boards/sdkconfig.ble
    boards/sdkconfig.spiram
    boards/GENERIC_SPIRAM_8MB/sdkconfig.board
)

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set(MICROPY_FROZEN_MANIFEST ${MICROPY_BOARD_DIR}/manifest.py)

Then you can build & flash the image with

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make BOARD=<new_board_name> deploy