Wolfgang Denk
0b8f2a2786
Conding style cleanup
|
17 年 前 | |
|---|---|---|
| .. | ||
| Makefile | 17 年 前 | |
| README.txt | 17 年 前 | |
| config.mk | 17 年 前 | |
| hcu4.c | 17 年 前 | |
| u-boot.lds | 17 年 前 | |
README.txt
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
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