RTEMS | BSP Improvements for RPi4 (&6)

[Ning Yang (@yangn0)]

Ning Yang commented: https://gitlab.rtems.org/groups/rtems/-/epics/6#note_110990


Planned:
- SD R/W access support
  - DMA driver

Completed:
1. Implemented FDT support for sdhci. Successfully got the value of `reg` property. The dts file still need to be improved.
https://gitlab.rtems.org/yangn0/rtems/-/commit/470d9cb763b4689b519ef069b61717d7a23c7780

2. Study DMA driver: I plan to implement it following the API in `freebsd-org/sys/arm/broadcom/bcm2835/bcm2835_dma.h`. It is used in `bcm2835_sdhci.c` file.

Blockers/Problems:
1. I am currently studying FDT support and DMA driver. After finish them, I need to study the mailbox driver, and finally I can start studying the sd card driver. There is a lot of work to support sd card, and I'm afraid I won't be able to finish it before the deadline. These are more complicated than I thought.
If I can't finish them before the deadline, Can I apply for a deadline extension?

Next week plans:
- SD R/W access support
  - DMA driver
  - FDT support: Improve the dts file according to bcm2835_sdhci.c.
  - mailbox

-- 
View it on GitLab: https://gitlab.rtems.org/groups/rtems/-/epics/6#note_110990
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