micropython/ports
Damien George e0905e85a7 esp8266: Change from FAT to littlefs v2 as default filesystem.
This commit changes the esp8266 boards to use littlefs v2 as the
filesystem, rather than FAT.  Since the esp8266 doesn't expose the
filesystem to the PC over USB there's no strong reason to keep it as FAT.
Littlefs is smaller in code size, is more efficient in use of flash to
store data, is resilient over power failure, and using it saves about 4k of
heap RAM, which can now be used for other things.

This is a backwards incompatible change because all existing esp8266 boards
will need to update their filesystem after installing new firmware (eg
backup old files, install firmware, restore files to new filesystem).

As part of this commit the memory layout of the default board (GENERIC) has
changed.  It now allocates all 1M of memory-mapped flash to the firmware,
so the filesystem area starts at the 2M point.  This is done to allow more
frozen bytecode to be stored in the 1M of memory-mapped flash.  This
requires an esp8266 module with 2M or more of flash to work, so a new board
called GENERIC_1M is added which has the old memory-mapping (but still
changed to use littlefs for the filesystem).

In summary there are now 3 esp8266 board definitions:
- GENERIC_512K: for 512k modules, doesn't have a filesystem.
- GENERIC_1M: for 1M modules, 572k for firmware+frozen code, 396k for
  filesystem (littlefs).
- GENERIC: for 2M (or greater) modules, 968k for firmware+frozen code,
  1M+ for filesystem (littlefs), FAT driver also included in firmware for
  use on, eg, external SD cards.
2020-04-04 16:30:36 +11:00
..
bare-arm py/mpconfig.h: Enable MICROPY_MODULE_GETATTR by default. 2020-03-26 01:21:04 +11:00
cc3200 all: Remove spaces between nested paren and inside function arg paren. 2020-03-25 00:39:46 +11:00
esp32 esp32/README.md: Fix typo in venv instructions. 2020-04-02 22:52:48 +11:00
esp8266 esp8266: Change from FAT to littlefs v2 as default filesystem. 2020-04-04 16:30:36 +11:00
javascript all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
mimxrt all: Remove spaces inside and around parenthesis. 2020-03-28 23:36:44 +11:00
minimal all: Remove spaces inside and around parenthesis. 2020-03-28 23:36:44 +11:00
nrf ports: Add lib/libm/roundf.c to bare-metal Makefile's. 2020-03-25 01:22:00 +11:00
pic16bit all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
powerpc all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
qemu-arm qemu-arm: Set default board as mps2-an385 to get more flash for tests. 2020-03-26 01:21:04 +11:00
samd all: Remove spaces inside and around parenthesis. 2020-03-28 23:36:44 +11:00
stm32 all: Remove spaces inside and around parenthesis. 2020-03-28 23:36:44 +11:00
teensy all: Remove spaces inside and around parenthesis. 2020-03-28 23:36:44 +11:00
unix unix/mpthreadport: Ensure enough thread stack to detect overflow. 2020-03-31 09:35:46 +11:00
windows all: Remove spaces inside and around parenthesis. 2020-03-28 23:36:44 +11:00
zephyr zephyr: Update machine.Pin class to use new zephyr gpio api. 2020-03-25 00:29:42 +11:00