OSError: [Errno 19] ENODEV

[frankvp11]

Good morning,
I'm working on creating a firmware that I can flash onto my Pico W so that I can upload the config for it and then just let the pico run.
The problem that I'm facing is writing files to the system. When I try to open a file it throws the above error.
The file that I'm going to be attempting to write is going to be either JSON or a Python file (in the py file it would just be the json in a variable).
Here is some terminal output that I believe would be useful:

>>> os.chdir("/")
>>> file = open("test.txt")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: [Errno 19] ENODEV
>>> import sys
>>> print(sys.implementation)
(name='micropython', version=(1, 26, 0, 'preview'), _machine='Raspberry Pi Pico W with RP2040', _mpy=4870, _build='RPI_PICO_W')
>>> fs_stat = os.statvfs('/')
>>> 
>>> fs_stat
(0, 0, 0, 0, 0, 0, 0, 0, 0, 128)
>>> print(f"File system size {fs_stat[0] * fs_stat[2]:,}")
File system size 0

This is my manifest.py:

freeze("$(PORT_DIR)/modules", ("main.py", "ntptime.py", "setup_mode.py"))

# Freeze entire packages to preserve directory structure
package("sensor_code", base_path="$(PORT_DIR)/modules")
package("uwebsockets", base_path="$(PORT_DIR)/modules")

# Include asyncio support
include("$(MPY_DIR)/extmod/asyncio/manifest.py")

Don't worry too much about the other files, it's mainly the file writing problem that I'm looking to solve.
I did add the file mpconfigboard.mk in the boards/RPI_PICO_W directory with this inside of it: MICROPY_VFS_FAT = 1
This is the command I use to build the firmware:
make BOARD=RPI_PICO_W FROZEN_MANIFEST=~/Documents/micropython/ports/rp2/manifest.py (which does succeed).

Let me know if you need more terminal output, or if there is something you'd like me to test.

[peterhinch]

I think the problem lies here

freeze("$(PORT_DIR)/modules", ("main.py", "ntptime.py", "setup_mode.py"))

The docs state

If script is None, all files in path will be frozen.

This seems to imply that, if script is not None, files in path will not be frozen. So you'll be missing _boot.py. I suggest adding a line to ensure that the modules are frozen:

freeze("$(PORT_DIR)/modules")
freeze("$(PORT_DIR)/modules", ("main.py", "ntptime.py", "setup_mode.py"))

As a general point you seem to have made effort to minimise the number of frozen modules. In my experience this is unnecessary: bytecode is compact and the size of the binary is not critical. I routinely freeze an entire GUI with fonts, demos, and unused widgets (along with all the standard files).

[frankvp11]

Hmm, when I try that, it seems to not be able to build.
I've pasted here a shortened version of the logs, let me know if anything stands out to you

/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:6176:33: error: 'frozen_module_sensor_code_sensor_main' defined but not used [-Werror=unused-const-variable=]
 6176 | static const mp_frozen_module_t frozen_module_sensor_code_sensor_main = {
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:5173:33: error: 'frozen_module_sensor_code___init__' defined but not used [-Werror=unused-const-variable=]
 5173 | static const mp_frozen_module_t frozen_module_sensor_code___init__ = {
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:4986:33: error: 'frozen_module_ntptime' defined but not used [-Werror=unused-const-variable=]
 4986 | static const mp_frozen_module_t frozen_module_ntptime = {
      |                                 ^~~~~~~~~~~~~~~~~~~~~
/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:4632:33: error: 'frozen_module_main' defined but not used [-Werror=unused-const-variable=]
 4632 | static const mp_frozen_module_t frozen_module_main = {
      |                                 ^~~~~~~~~~~~~~~~~~
/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:1984:33: error: 'frozen_module_setup_mode' defined but not used [-Werror=unused-const-variable=]
 1984 | static const mp_frozen_module_t frozen_module_setup_mode = {
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[3]: *** [CMakeFiles/firmware.dir/build.make:3759: CMakeFiles/firmware.dir/frozen_content.c.o] Error 1
make[3]: Leaving directory '/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W'
make[2]: *** [CMakeFiles/Makefile2:1792: CMakeFiles/firmware.dir/all] Error 2
make[2]: Leaving directory '/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W'
make[1]: *** [Makefile:91: all] Error 2
make[1]: Leaving directory '/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W'
-e See https://github.com/micropython/micropython/wiki/Build-Troubleshooting
make: *** [Makefile:65: all] Error 1

[peterhinch]

Please try a build with only

freeze("$(PORT_DIR)/modules")

and see if it builds, and if the filesystem is available. If so, the fault is with the second line - I would guess with the path to those files?

freeze("$(PORT_DIR)/modules", ("main.py", "ntptime.py", "setup_mode.py"))

[frankvp11]

When I try that, it still gives a similar error. This is the output:

/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:13160:33: error: redefinition of 'frozen_module_sensor_code_sensor'
13160 | static const mp_frozen_module_t frozen_module_sensor_code_sensor = {
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:8105:33: note: previous definition of 'frozen_module_sensor_code_sensor' was here
 8105 | static const mp_frozen_module_t frozen_module_sensor_code_sensor = {
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:8105:33: error: 'frozen_module_sensor_code_sensor' defined but not used [-Werror=unused-const-variable=]
/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:7729:33: error: 'frozen_module_sensor_code_config_loader' defined but not used [-Werror=unused-const-variable=]
 7729 | static const mp_frozen_module_t frozen_module_sensor_code_config_loader = {
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:7374:33: error: 'frozen_module_sensor_code_proximity_sensor' defined but not used [-Werror=unused-const-variable=]
 7374 | static const mp_frozen_module_t frozen_module_sensor_code_proximity_sensor = {
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:6957:33: error: 'frozen_module_sensor_code_config' defined but not used [-Werror=unused-const-variable=]
 6957 | static const mp_frozen_module_t frozen_module_sensor_code_config = {
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:6754:33: error: 'frozen_module_sensor_code_ter12_sensor' defined but not used [-Werror=unused-const-variable=]
 6754 | static const mp_frozen_module_t frozen_module_sensor_code_ter12_sensor = {
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:6176:33: error: 'frozen_module_sensor_code_sensor_main' defined but not used [-Werror=unused-const-variable=]
 6176 | static const mp_frozen_module_t frozen_module_sensor_code_sensor_main = {
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W/frozen_content.c:5173:33: error: 'frozen_module_sensor_code___init__' defined but not used [-Werror=unused-const-variable=]
 5173 | static const mp_frozen_module_t frozen_module_sensor_code___init__ = {
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[3]: *** [CMakeFiles/firmware.dir/build.make:3759: CMakeFiles/firmware.dir/frozen_content.c.o] Error 1
make[3]: Leaving directory '/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W'
make[2]: *** [CMakeFiles/Makefile2:1792: CMakeFiles/firmware.dir/all] Error 2
make[2]: Leaving directory '/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W'
make[1]: *** [Makefile:91: all] Error 2
make[1]: Leaving directory '/home/frankvp11/Documents/WaterProject/TestingPackaging/micropython/ports/rp2/build-RPI_PICO_W'
-e See https://github.com/micropython/micropython/wiki/Build-Troubleshooting
make: *** [Makefile:65: all] Error 1

[frankvp11]

I'm sorry - I made a mistake.
It appears that when you remove the following lines also:

# package("sensor_code", base_path="$(PORT_DIR)/modules")
# package("uwebsockets", base_path="$(PORT_DIR)/modules")

it works. I've marked it as the answer