mirror of
https://github.com/AsahiLinux/u-boot
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59 lines
1.3 KiB
Text
59 lines
1.3 KiB
Text
HCU4 Configuration Details
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Memory Bank 0 -- Flash chip
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---------------------------
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0xfff00000 - 0xffffffff
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The flash chip is really only 512Kbytes, but the high address bit of
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the 1Meg region is ignored, so the flash is replicated through the
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region. Thus, this is consistent with a flash base address 0xfff80000.
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The placement at the end is to be consistent with reset behavior,
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where the processor itself initially uses this bus to load the branch
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vector and start running.
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On-Chip Memory
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--------------
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0xf4000000 - 0xf4000fff
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The 405GPr includes a 4K on-chip memory that can be placed however
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software chooses. I choose to place the memory at this address, to
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keep it out of the cachable areas.
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Internal Peripherals
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--------------------
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0xef600300 - 0xef6008ff
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These are scattered various peripherals internal to the PPC405GPr
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chip.
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Chip-Select 2: Flash Memory
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---------------------------
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0x70000000
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Chip-Select 3: CAN Interface
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----------------------------
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0x7800000
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Chip-Select 4: IMC-bus standard
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-------------------------------
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Our IO-Bus (slow version)
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Chip-Select 5: IMC-bus fast (inactive)
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--------------------------------------
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Our IO-Bus (fast, but not yet use)
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Memory Bank 1 -- SDRAM
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-------------------------------------
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0x00000000 - 0x1ffffff # Default 32 MB
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