RTEMS | Adding I2C, PWM, DMA and Mailbox Support to the Raspberry Pi 4B BSP (#23)

[Shaunak Datar (@skdatar)]

Shaunak Datar commented: https://gitlab.rtems.org/groups/rtems/-/work_items/23#note_126208


The code for dma is in the working and I am pushing it to the [DMA Branch](https://gitlab.rtems.org/skdatar/rtems/-/tree/aarch64-raspi-dma?ref_type=heads). The current status on testing the dma controllers- Memory to memory copy is working on qemu. It is not yet working on hardware because on hardware the dma paused bit is set high when the controller gets to it which causes the dma transfer to fail

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View it on GitLab: https://gitlab.rtems.org/groups/rtems/-/work_items/23#note_126208
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