2.1 Memory Map
Gekko Memory Map
Address Range Description
0x00000000 - 0x017FFFFF Physical RAM Address. Not
accessible from the CPU
0x80000000 - 0x817FFFFF Cached RAM Address (CPU Accessible)
0xC0000000 - 0xC17FFFFF Uncached RAM Address (CPU Accessible)
0xC8000000 - 0xC1FFFFFF Embedded Frame Buffer (EFB) wrapper
0xCC000000 - 0xCC00FFFF Hardware Registers
0xFFF00000 - 0xFFFFFFFF Initial Program Loader (IPL) descrambling wrapper
DSP Memory Map
Address Range Description
To be completed...
GP Memory Map
Address Range Description
To be completed...
Special Note on IPL by org:
Developer boards have 48MB of RAM.
IPL is mapped at 0xFFF00000 after
hardware reset. It is loaded into upper memory (0x81300000), executed there, and
then auto-destroyed.
Special bootstrap program prevent accesses to IPL, after
reset. Access to IPL is controlled by 17th bit of 0xCC006800 : Write :
0 = Have no effect
1 = Disable IPL access
Read :
0 = IPL access enabled
1 = IPL access disabled
Example program, to disable IPL : void DisableROM()
{
*(u32 *)0xcc006800 |= 0x00004000;
}