linguini1 opened a new pull request, #15188:
URL: https://github.com/apache/nuttx/pull/15188
## Summary
*Update this section with information on why change is necessary,
what it exactly does and how, if new feature shows up, provide
references (dependencies, similar problems and solutions), etc.*
This PR adds semi-functional support for the BCM2711 and Raspberry Pi 4B.
The working features are a Mini-UART shell which can boot into NSH. I have run
OStest and confirmed it works. The latest changes also boot.
## Impact
Although the feature implementation for this board is minimal right now, I
hope that by releasing the work I've done so far it is easier for other
community members to start adding drivers/features to the board's support on
NuttX. Several people were interested in using the Pi 4B with NuttX and it's a
reasonably popular development board, so having it fully supported will be an
asset.
## Testing
Built the documentation, ensured it looks correct.
Built the written code so far, which was tested by:
- Connecting the RPi 4B to my computer via USB-TTL cable and playing around
in the shell
- Running test programs like OStest and getprime (succeeded)
- Running i2ctool with some I2C devices connected to the board. I was able
to dump the contents of an EEPROM but not much more, I am confused by the I2C
register interface and haven't spent enough time to overcome these issues.
Partial completeness is noted on the docs page.
- Tested GPIO driver interface by performing basic operations such as `echo
1 > /dev/gpio23` and checking with a multimeter that the GPIO has gone high, or
connecting input to a GPIO and performing `cat /dev/gpio23`, etc.
OStest results log are attached
[ostest-bcm2711.txt](https://github.com/user-attachments/files/18130753/ostest-bcm2711.txt)
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