mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-29 16:10:58 +00:00
59 lines
1.3 KiB
Text
59 lines
1.3 KiB
Text
HCU4 Configuration Details
|
|
|
|
Memory Bank 0 -- Flash chip
|
|
---------------------------
|
|
|
|
0xfff00000 - 0xffffffff
|
|
|
|
The flash chip is really only 512Kbytes, but the high address bit of
|
|
the 1Meg region is ignored, so the flash is replicated through the
|
|
region. Thus, this is consistent with a flash base address 0xfff80000.
|
|
|
|
The placement at the end is to be consistent with reset behavior,
|
|
where the processor itself initially uses this bus to load the branch
|
|
vector and start running.
|
|
|
|
On-Chip Memory
|
|
--------------
|
|
|
|
0xf4000000 - 0xf4000fff
|
|
|
|
The 405GPr includes a 4K on-chip memory that can be placed however
|
|
software chooses. I choose to place the memory at this address, to
|
|
keep it out of the cachable areas.
|
|
|
|
|
|
Internal Peripherals
|
|
--------------------
|
|
|
|
0xef600300 - 0xef6008ff
|
|
|
|
These are scattered various peripherals internal to the PPC405GPr
|
|
chip.
|
|
|
|
Chip-Select 2: Flash Memory
|
|
---------------------------
|
|
|
|
0x70000000
|
|
|
|
Chip-Select 3: CAN Interface
|
|
----------------------------
|
|
0x7800000
|
|
|
|
|
|
Chip-Select 4: IMC-bus standard
|
|
-------------------------------
|
|
|
|
Our IO-Bus (slow version)
|
|
|
|
|
|
Chip-Select 5: IMC-bus fast (inactive)
|
|
--------------------------------------
|
|
|
|
Our IO-Bus (fast, but not yet use)
|
|
|
|
|
|
Memory Bank 1 -- SDRAM
|
|
-------------------------------------
|
|
|
|
0x00000000 - 0x1ffffff # Default 32 MB
|