RTEMS | BSP Improvements for RPi4 (&6)

[Ning Yang (@yangn0)]

Ning Yang commented: https://gitlab.rtems.org/groups/rtems/-/epics/6#note_109782


Coding Period Week #11

Planned:
1. Imporve PL011 MR.
2. Imporve SPI MR.
3. Imporve SPI interrupt mode.
4. SD R/W access support

Completed:
1. aarch64/raspberrypi: Add Interrupt mode for SPI driver. rtems/rtos/rtems!103
  - I figured out the workflow of SPI interrupt mode and added interrupt mode to SPI driver. I mainly referred to `dev/bsps/shared/dev/spi/cadence-spi.c`. SSD1306 works fine both in interrupt mode and polling mode. I shorted MOSI and MISO and did a full duplex test with ioctl(), It works fine in both modes.
  - I am writing a blog to record the SPI driver development process.
 
2. Improved pl011 MR. rtems/rtos/rtems!47 
3. Improved Watchdog MR. rtems/rtos/rtems!120 

Blockers/Problems:
None

Next week plans:
- SD R/W access support

-- 
View it on GitLab: https://gitlab.rtems.org/groups/rtems/-/epics/6#note_109782
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