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Fixes #2105

W5100 doesn't support isLinked, so no change needed there.

Fixes #1870

Fixes #2033

Same pinout as the plain Pico, just different flash and # of GPIOs

Fixes #2054

Fix #2094

* Add FatFS for onboard flash use/sharing of FAT

* Move all to "fatfs" namespace

The FatFS library defines commonly used names like WORD which could conflict
with user code otherwise.

* Restyle

* FTL-based, wear-leveling FatFS with USB export

Allow using FAT filesystem with onboard flash in a safer, wear-leveled
way and to export the onboard flash to the host as a USB drive for easy
data transfer.

* Update documentation

* Fix submodule reference

* Don't spellehcek ChaN FatFS files

* Disable FTL debugging

* More codespell skips

* Move to latest SPIFTL library

* Allow using raw flash instead of FTL

* Remove unneeded static FIL 4k allocation

* Expose FAT FS format configuration options

* Update documentation

* Remove USB partial flash rewrites

* Remove unneeded dups of FatFS sources

Leave the LICENSE.md and README.md to point to upstream.

* Clean up comments

Hi,

Just a typo and a couple of wording corrections.

Fixes #2047

Fixes #2034

Fixes #2019

Fixes #2008

MACs are 6-bytes long, not 8.

See https://github.com/earlephilhower/arduino-pico/pull/2001#issuecomment-1944461469

Remove the HW random generator call while initting LWIP to avoid the SDK
looping forver due to FreeRTOS exception/timer interrupts.

The `Picoprobe` example showing how to upload to Ubuntu is invalid because Ubuntu does not create or assign users to a `users` group (for many major releases, now). 

The reason the example worked is because the permissions were applied globally, rendering the `GROUP=users` assignment in the rule irrelevant. Hence, this assignment has been dropped.  

The `pico-debug` example has been updated similarly, but it uses a proper group-level rule, and Ubuntu does still use group `plugdev`. 

The reader thus has two good examples of creating `udev` rules.

WiFiMulti specifies a specific BSSID, in addition to the AP name and
password.  In the WiFi core the BSSID is stored as the raw 6-byte MAC
address, but the ESPHostedFG firmware expects a formatted C-String
(i.e. "ab:cd:ef:01:02:03" instead of {0xab, 0xcd, 0xef, 1, 2, 3})

Convert the raw bytes to the string format expected in the ESP FW.

Use the #define board name to identify when building for the
WIZnet W5100s-EVB-Pico and assign the proper pins and IRQs.

Fixes #1991

Correct buffer size to match Wire.h

Remove outdated(?) info

No polling needed and massively reduces latency by using the GPIO interrupt to
signal the Pico to read a received packet.  Also drops CPU load when no packets
are incoming.