IOP/Deckard
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IOP
I/O processor - MIPS R3000A (PS1 main processor) used in PS2 since SCPH-100XX to SCPH-700XX. Later replaced by PowerPC 405 and DECKARD IOP emulator.
DECKARD
PowerPC 405 chip that replaced IOP. Chip include 4MB SDRAM. In IOP emulator mode 2MB are used as a IOP memory. In PS2 used since SCPH-750XX model. New chip require some compatibility tweaks that are done per title by xparam file found in PS2 ROM.
TLB Entries
User-defined storage attribute Un n=[0-3]----\ Guarded--------\ | Memory Coherence-----\ | | Cache Inhibit-----\ | | | Write-Through--\ | | | | Read/Write/eXecute------\ | | | | | Endian (Big/little)--\ | | | | | | | | | | | | | Virtual Physical Size | | | | | | | | | | | | | | 0xFFE00000 0xFFE00000 0x00100000 B RX 1 0 0 0 - DECKARD's BOOT ROM PPC440 BOOT ROM: 0xFFE00000 - 0xFFFFFFFF (2MB) 0xFFF00000 0xFFF00000 0x00100000 B RX 1 0 0 0 - DECKARD's BOOT ROM 0x00000000 0x00200000 0x00100000 l RW 1 0 0 0 2 IOP RAM low 1MB mirror virtual R3000 IOP instructions use 0x00100000 0x00300000 0x00100000 l RW 1 0 0 0 2 IOP RAM high 1MB mirror 0x00200000 0x00200000 0x00100000 IOP RAM low 1MB mirror 0x00300000 0x00300000 0x00100000 IOP RAM high 1MB mirror 0x00400000 0x00200000 0x00100000 IOP RAM low 1MB mirror 0x00500000 0x00300000 0x00100000 IOP RAM high 1MB mirror 0x00600000 0x00200000 0x00100000 IOP RAM low 1MB mirror 0x00700000 0x00300000 0x00100000 IOP RAM high 1MB mirror 0xDFE00000 0x00200000 0x00100000 l R 1 0 0 0 2 IOP RAM low 1MB mirror NOT:EE SIF (SBUS) IOP mem. window ? most likely:DECKARD 'supervisor' ?? 0xDFF00000 0x00300000 0x00100000 l R 1 0 0 0 2 IOP RAM high 1MB mirror 0x00000000 0x00000000 0x00100000 l RW 0 1 0 0 - 1MB Invalid these two segments are the same! one maps to 0x00200000 and the other to 0 Switcing the valid entries is done in code. 0x00100000 0x00100000 0x00100000 l RW 0 1 0 0 - 1MB Invalid 0x00200000 0x00000000 0x00100000 lit 0x00300000 0x00100000 0x00100000 lit 0x00400000 0x00000000 0x00100000 lit 0x00500000 0x00100000 0x00100000 lit 0x00600000 0x00000000 0x00100000 lit 0x00700000 0x00100000 0x00100000 lit 0xDFE00000 0x00000000 0x00100000 l R 0 1 0 0 - 1MB Invalid 0xDFF00000 0x00100000 0x00100000 l R 0 1 0 0 - 1MB Invalid 0x00A00000 0x00A00000 0x00100000 B RWX1 0 0 0 - 1MB DECKARD file RAM loading segment (code & data) 0x00BE0000 0x00B60000 0x00001000 B RW 0 0 0 0 - 4kB Some variables and flags...? 0x00BFF000 0x00B7F000 0x00001000 B RW 0 0 0 0 - 4kB PPC stack? 0x00BDF000 0x00B7F000 0x00001000 B R 0 0 0 0 - 4kB 0x00B40000 0x00B40000 0x00000400 l RW 0 1 0 0 - 1kB 0x00B40400 0x00B40400 0x00000400 l RW 0 1 0 0 - 1kB 0x00B40C00 0x00FFFC00 0x00000400 l RW 0 1 0 0 - 1kB The physical addr. of this is in the last 1kB of the 16MB of IOP RAM. 0x01000000 0x40000000 0x00000400 B RW 0 1 0 1 - 1kB PPC devices: PPC UART is here 0x40000000 0x00200000 0x00100000 l RW 1 0 0 0 2 1MB IOP RAM low 1MB mirror 0x40100000 0x00300000 0x00100000 l RW 1 0 0 0 2 1MB IOP RAM high 1MB mirror 0x40200000 0x00200000 0x00100000 l RW 1 0 0 0 2 1MB IOP RAM low 1MB mirror 0x40300000 0x00300000 0x00100000 l RW 1 0 0 0 2 1MB IOP RAM high 1MB mirror 0x40400000 0x00200000 0x00100000 l RW 1 0 0 0 2 1MB IOP RAM low 1MB mirror 0x40500000 0x00300000 0x00100000 l RW 1 0 0 0 2 1MB IOP RAM high 1MB mirror 0x40600000 0x00200000 0x00100000 l RW 1 0 0 0 2 1MB IOP RAM low 1MB mirror 0x40700000 0x00300000 0x00100000 l RW 1 0 0 0 2 1MB IOP RAM high 1MB mirror 0x12000000 0x10000000 0x01000000 l RW 0 1 0 1 2 16MB IOP devices - Dev#10 Dev9_2, Dev#12 Dev9_3 ?? 0x13000000 0x11000000 0x01000000 l RW 0 1 0 1 2 16MB Dev9/SPEED - placed here sor some reason rather than at 0x10000000. 0x1D000000 0x1D000000 0x00000400 l RW 0 1 0 1 2 1kB SIF SBUS BDn regs on EE, accessed through SBUS 0x1E000000 0x1E000000 0x01000000 l RW 0 1 0 1 2 16MB Dev#1 ROM-DVD /CS1 0x1F402000 0x1F402000 0x00000400 l RW 0 1 0 1 2 1kB Dev#5 CDVD /CS5 0x1F7FFC00 0x00B00400 0x00000400 l RW 0 1 0 1 2 1kB Cache ? 0x00BDE800 0x00B00000 0x00000400 l R 0 0 0 0 - 1kB Cache. Status reg? 0x00BDEC00 0x00B00400 0x00000400 l R 0 0 0 0 - 1kB Cache. Status reg? 0x1F801000 0x1F801000 0x00001000 l RW 0 1 0 1 2 4kB IOP devices (DMAC, SSBUSC,...) and Dev#4 SPU /CS4 0x1F802000 0x1F802000 0x00001000 l RW 0 1 0 1 2 4kB Dev#8 Exp2 /EXTR (PIO) 0x1F803000 0x1F803000 0x00001000 l RW 0 1 0 1 2 4kB Dev#8 Exp2 /EXTR (PIO) 0x1F808000 0x1F808000 0x00000400 l RW 0 1 0 1 2 1kB SIO2, iLink 0x1F900000 0x1F900000 0x00001000 l RW 0 1 0 1 2 4kB Dev#4 Hard-wired (not through SSBUSC address reg.) SPU2 regs. 0x1FC00000 0x1FC00000 0x00100000 l RW 0 1 0 1 2 1MB Dev#2 ROM-BOOT /CS2 0x1FC00000-0x1FFFFFFF 4MB 0x1FD00000 0x1FD00000 0x00100000 l RW 0 1 0 1 2 1MB Dev#2 ROM-BOOT /CS2 0x1FE00000 0x1FE00000 0x00100000 l RW 0 1 0 1 2 1MB Dev#2 ROM-BOOT /CS2 0x1FF00000 0x1FF00000 0x00100000 l RW 0 1 0 1 2 1MB Dev#2 ROM-BOOT /CS2 TLB entries = 54 (55?) up to here, of 64 maximum. At this point the code gets the number of remaining TLB entries = 10 and disables them. Then it sets-up 4 more entries, starting from 60: 0x5F800400 0x00B00400 0x00000400 l RW 0 1 0 1 2 1kB IOP Cache / Scratchpad 0x5F800000 0x00B00000 0x00000400 l RW 0 1 0 1 2 1kB 0x1F800400 0x00B00400 0x00000400 l RW 0 1 0 1 2 1kB 0x1F800000 0x00B00000 0x00000400 l RW 0 1 0 1 2 1kB
Per game configuration
Deckard to keep better compatibility use some flags/settings selected per Title ID. List of configurations is stored in rom:XPARAM. Default values are listed in table below.
| Command | Value | Name |
|---|---|---|
| 0x00 | 0x1F4 | PARAM_MDEC_DELAY_CYCLE |
| 0x01 | 0x7D0 | PARAM_SPU_INT_DELAY_LIMIT |
| 0x02 | 0x23 | PARAM_SPU_INT_DELAY_PPC_COEFF |
| 0x03 | 0x7D0 | PARAM_SPU2_INT_DELAY_LIMIT |
| 0x04 | 0x14 | PARAM_SPU2_INT_DELAY_PPC_COEFF |
| 0x05 | 0 | PARAM_DMAC_CH10_INT_DELAY |
| 0x06 | 1 | PARAM_CPU_DELAY |
| 0x07 | 0x20 | PARAM_SPU_DMA_WAIT_LIMIT |
| 0x08 | 0 | PARAM_GPU_DMA_WAIT_LIMIT |
| 0x09 | 0 | PARAM_DMAC_CH10_INT_DELAY_DPC |
| 0x0A | 0 | PARAM_CPU_DELAY_DPC |
| 0x0B | 0 | PARAM_USB_DELAYED_INT_ENABLE |
| 0x0C | 0 | PARAM_TIMER_LOAD_DELAY |
| 0x0D | 0x229C | PARAM_SIO0_DTR_SCK_DELAY |
| 0x0E | 0x6EC | PARAM_SIO0_DSR_SCK_DELAY_C |
| 0x0F | 0x6EC | PARAM_SIO0_DSR_SCK_DELAY_M |
| 0x10 | 1 | PARAM_MIPS_DCACHE_ON |
| 0x11 | 0x90 | PARAM_CACHE_FLASH_CHANNELS |
Example settings from XPARAM file.
| Name | Command | Value | Title ID |
|---|---|---|---|
| PARAM_CPU_DELAY | 6 | 0xB60 | SLPS_250.72 |
| PARAM_MIPS_DCACHE_ON | 0x10 | 0 | SLPS_250.72 |
| PARAM_CACHE_FLASH_CHANNELS | 0x11 | 0x10 | SLPS_250.79 |
| PARAM_CPU_DELAY | 6 | 0xC80 | SLPS_250.79 |
| PARAM_DMAC_CH10_INT_DELAY | 5 | 0x3E8 | SLPS_250.79 |