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esp32/README: Update README to describe auto filesystem sizing.
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Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
@@ -221,6 +221,30 @@ import machine
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antenna = machine.Pin(16, machine.Pin.OUT, value=0)
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```
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Partition table and filesystem size
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-----------------------------------
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ESP32 firmware contains a bootloader, partition table and main application
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firmware, which are all stored in (external) SPI flash. The user filesystem
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is also stored in the same SPI flash. By default, MicroPython does not have
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a fixed entry in the ESP32 partition table for the filesystem. Instead it
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will automatically determine the size of the SPI flash upon boot, and then --
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so long as there is no existing partition called "vfs" or "ffat" -- it will
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create a partition for the filesystem called "vfs" which takes all of the
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remaining flash between the end of the last defined partition up until the
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end of flash.
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This means that firmware built for, say, a 4MiB flash will work on any
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device that has at least 4MiB flash. The user "vfs" filesystem will then
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take up as much space as possible.
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This auto-detection behaviour can be overridden: if the ESP32 partition
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table does contain an entry called "vfs" or "ffat" then these are used for
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the user filesystem and no automatic "vfs" partition is added. This is
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useful in cases where only the MicroPython ESP32 application is flashed to
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the device (and not the bootloader or partition table), eg when deploying
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.uf2 files.
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Defining a custom ESP32 board
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-----------------------------
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