PSP Memory

PSP Memory Map

Base Address Length Description 0×00010000 0×00004000 (16 KiB) Allegrex Scratchpad 0×04000000 0×00200000 (2 MiB) Ge VRAM 0×08000000 0×00800000 (8 MiB) Allegrex Kernel memory 0×08800000 0×01800000 (24 MiB) Allegrex User memory

PSP Memory Partitions

The following table is based on results from calling sceKernelQueryMemoryPartitionInfo.

Partition Start Address Size Unknown Description 1 0×88000000 0×00300000 (3 MiB) 0xC Kernel 1 2 0×08000000 0×01800000 (24 MiB) 0xF User 3 0×88000000 0×00300000 (3 MiB) 0xC Kernel 1 4 0×88300000 0×00100000 (1 MiB) 0xC Kernel 2 5 0×88400000 0×00400000 (4 MiB) 0xF Kernel 3 6 0×08800000 0×01800000 (24 MiB) 0xF User

IMPORTANT

To get uncached reads and writes, OR your pointers with 0×40000000 (for example, the location of the Ge VRAM then becomes 0×44000000). When writing to VRAM or feeding data to the GE (graphics chip) through display lists in main memory, this is VERY important. Not doing so will cause unpredictable behaviour and hanging because the graphics chip may miss your END and FINISH commands since they might still be sitting in the cache.