README.txt 1.2 KB

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  1. JSE Configuration Details
  2. Memory Bank 0 -- Flash chip
  3. ---------------------------
  4. 0xfff00000 - 0xffffffff
  5. The flash chip is really only 512Kbytes, but the high address bit of
  6. the 1Meg region is ignored, so the flash is replicated through the
  7. region. Thus, this is consistent with a flash base address 0xfff80000.
  8. The placement at the end is to be consistent with reset behavior,
  9. where the processor itself initially uses this bus to load the branch
  10. vector and start running.
  11. On-Chip Memory
  12. --------------
  13. 0xf4000000 - 0xf4000fff
  14. The 405GPr includes a 4K on-chip memory that can be placed however
  15. software chooses. I choose to place the memory at this address, to
  16. keep it out of the cachable areas.
  17. Memory Bank 1 -- SystemACE Controller
  18. -------------------------------------
  19. 0xf0000000 - 0xf00fffff
  20. The SystemACE chip is along on peripheral bank CS#1. We don't need
  21. much space, but 1Meg is the smallest we can configure the chip to
  22. allocate. We need it far away from the flash region, because this
  23. region is set to be non-cached.
  24. Internal Peripherals
  25. --------------------
  26. 0xef600300 - 0xef6008ff
  27. These are scattered various peripherals internal to the PPC405GPr
  28. chip.
  29. SDRAM
  30. -----
  31. 0x00000000 - 0x07ffffff (128 MBytes)