In case (user) source code contains utf-8 encoded data and the default
locale is not utf-8.

See #4592.

And fix a typo in the comment on this line.

If MICROPY_HW_RTC_USE_BYPASS is enabled the RTC startup goes as follows:
- RTC is started with LSE in bypass mode to begin with
- if that fails to start (after a given timeout) then LSE is reconfigured
  in non-bypass
- if that fails to start then RTC is switched to LSI

To save space, since this board only hase 256k of flash.

The qstr window size is not log-2 encoded, it's just the actual number (but
in mpy-tool.py this didn't lead to an error because the size is just used
to truncate the window so it doesn't grow arbitrarily large in memory).

Addresses issue #4635.

Fixes the regression introduced in ea3c80a5

Via: nic.config(trace=2|4)

With dual-core enabled it's possible that the uPy task has full utilisation
of CPU1.  Fixes issue #4673.

When running Linux on WSL, Popen.kill() can raise a ProcessLookupError if
the process does not exist anymore, which can happen here since the
previous statement already tries to close the process by sending Ctrl-D to
the running repl.  This doesn't seem to be a problem on other OSes, so just
swallow the exception silently since it indicates the process has been
closed already, which after all is what we want.

Since commit da938a83 the tcp_arg() that is
set for the new connection is the new connection itself, and the parent
listening socket is found in the pcb->connected entry.

See corresponding commit b5f33ac2

Enable it via MICROPY_HW_ENABLE_MMCARD.

For consistency with the majority of other MICROPY_HW_ENABLE_xxx macros.

Fixes issue #3375.

This is needed now that the accept queue can have pending connections
removed asynchronously.

In such a case the connection is aborted by lwIP and so must be removed
from the pending accept queue.

The break mode is configurable via the 'brk' keyword to the Timer
constructor and init method.  It's disabled by default.

Use uos.dupterm for REPL configuration of the main USB_VCP(0) stream on
dupterm slot 1, if USB is enabled.  This means dupterm can also be used to
disable the boot REPL port if desired, via uos.dupterm(None, 1).

For efficiency this adds a simple hook to the global uos.dupterm code to
work with streams that are known to be native streams.

Single core is still supported, just by adding CONFIG_FREERTOS_UNICORE=y to
a custom sdkconfig file.

Unnamed semaphores (via sem_init) are not supported on this OS.  See #4465.

These macros are unused, and they can conflict with other entities by the
same name.  If needed they can be provided as static inline functions, or
just functions.

Fixes issue #4559.