micropython/esp8266/modules/_boot.py

import gc
gc.threshold((gc.mem_free() + gc.mem_alloc()) // 4)
import uos
from flashbdev import bdev

try:
    if bdev:
        vfs = uos.VfsFat(bdev)
        uos.mount(vfs, '/flash')
        uos.chdir('/flash')
except OSError:
    import inisetup
    vfs = inisetup.setup()

gc.collect()
esp8266: Explicitly collect garbage in bootstrap scripts. Leads to less fragmentation at teh time user code starts. 2016-07-02 17:20:13 +01:00			`import gc`
esp8266/_boot.py: Decrease GC alloc threshold to quarter of heap size. The idea behind decrease is: bytecode and other static data is also kept on heap, and can easily become half of heap, then setting threshold to half of heap will have null effect - GC will happen on complete heap exhaustion like before. But exactly in such config maintaining heap defragmented is very important, so lower threshold to accommodate that. 2016-07-23 11:56:24 +01:00			`gc.threshold((gc.mem_free() + gc.mem_alloc()) // 4)`
esp8266: Add Python modules for initial configuration. Main entry point is _boot.py which checks whether FAT FS in flash mountable, and if so, mounts it. Otherwise, it checks if flash is empty, and if so, performs initial module setup: makes FAT FS, configures default AP name, etc. As a last option, if flash is not empty, and could not be mounted, it means filesystem corruption, and warning message with instructions is printed in an infinite loop. 2016-04-11 22:37:04 +01:00			`import uos`
			`from flashbdev import bdev`

			`try:`
esp8266/scripts: Don't try to create filesystem on 512KB devices or less. There's no space for it. 2016-04-18 15:14:00 +01:00			`if bdev:`
esp8266: Change to use new generic VFS sub-system. The VFS sub-system supports mounting of an arbitrary number of devices (limited only by available RAM). The internal flash is now mounted at "/flash". 2017-01-27 04:16:08 +00:00			`vfs = uos.VfsFat(bdev)`
			`uos.mount(vfs, '/flash')`
			`uos.chdir('/flash')`
esp8266: Add Python modules for initial configuration. Main entry point is _boot.py which checks whether FAT FS in flash mountable, and if so, mounts it. Otherwise, it checks if flash is empty, and if so, performs initial module setup: makes FAT FS, configures default AP name, etc. As a last option, if flash is not empty, and could not be mounted, it means filesystem corruption, and warning message with instructions is printed in an infinite loop. 2016-04-11 22:37:04 +01:00			`except OSError:`
			`import inisetup`
esp8266/scripts: Move all of initial setup to inisetup module. 2016-04-29 18:02:59 +01:00			`vfs = inisetup.setup()`
esp8266: Explicitly collect garbage in bootstrap scripts. Leads to less fragmentation at teh time user code starts. 2016-07-02 17:20:13 +01:00
			`gc.collect()`