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rust-raspberrypi-OS-tutorials/0F_DMA_memory
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Andre Richter 48cf71b6d4
Add code for 0F_DMA_memory 		6 years ago
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README.md

Tutorial 0F - DMA Memory

Coming soon!

This lesson will teach about:

  • Simple bump memory allocators and non-cacheable memory.
  • Using MiniUart for early boot messages and dynamically switching to the PL011 Uart later (which now needs the memory allocator that theoretically could fail
    • which the MiniUart could then print).
[0] MiniUart online.
[1] Press a key to continue booting... Greetings fellow Rustacean!
[2] Switching MMU on now... MMU online.
[i] Memory layout:
      0x00000000 - 0x0007FFFF |  512 KiB | Kernel stack
      0x00080000 - 0x00083FFF |   16 KiB | Kernel code and RO data
      0x00084000 - 0x00087007 |   12 KiB | Kernel data and BSS
      0x00200000 - 0x005FFFFF |    4 MiB | DMA heap pool
      0x3F000000 - 0x3FFFFFFF |   16 MiB | Device MMIO
[i] Global DMA Allocator:
      Allocated Addr 0x00200000 Size 0x90
[3] Videocore Mailbox set up (DMA mem heap allocation successful).
[4] PL011 UART online. Output switched to it.

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