GPU/External Registers

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Map

  • 0x1EF00400 is the top screen
  • 0x1EF00500 is the bottom screen

Init Values from nngxInitialize for Top Screen

  • 0x1EF00400 = 0x1C2
  • 0x1EF00404 = 0xD1
  • 0x1EF00408 = 0x1C1
  • 0x1EF0040C = 0x1C1
  • 0x1EF00410 = 0
  • 0x1EF00414 = 0xCF
  • 0x1EF00418 = 0xD1
  • 0x1EF0041C = 0x1C501C1
  • 0x1EF00420 = 0x10000
  • 0x1EF00424 = 0x19D
  • 0x1EF00428 = 2
  • 0x1EF0042C = 0x1C2
  • 0x1EF00430 = 0x1C2
  • 0x1EF00434 = 0x1C2
  • 0x1EF00438 = 1
  • 0x1EF0043C = 2
  • 0x1EF00440 = 0x1960192
  • 0x1EF00444 = 0
  • 0x1EF00448 = 0
  • 0x1EF0045C = 0x19000F0
  • 0x1EF00460 = 0x1c100d1
  • 0x1EF00464 = 0x1920002
  • 0x1EF00470 = 0x80340
  • 0x1EF0049C = 0

More Init Values from nngxInitialize for Top Screen

  • 0x1EF00468 = 0x18300000, later changed by GSP module when updating state, framebuffer
  • 0x1EF0046C = 0x18300000, later changed by GSP module when updating state, framebuffer
  • 0x1EF00494 = 0x18300000
  • 0x1EF00498 = 0x18300000
  • 0x1EF00478 = 1, doesn't stay 1, read as 0
  • 0x1EF00474 = 0x10501

0x1EF00X5C

Bit Description
15-0 Framebuffer width?
31-16 Framebuffer height?

This register might control the framebuffer dimensions, however writing to this doesn't affect the displayed LCD image.

0x1EF00X78

Bit Description
0 LCD framebuffer to display (0=first, 1=second)
7-1 ?
31-8 Unused

0x1EF00X90

Bit Description
3-0 ?
7-4 Controls the framebuffer dimensions and/or color format
31-7 ?

This register controls how the LCD framebuffer is displayed.

0x1EF018E0

Register address Description
0x1EF018E0 Buffer Size>>3
0x1EF018E8 Buffer physical address>>3
0x1EF018F0 Writing value 1 here triggers GPU processing for the specified buffer

These 3 registers are used by GX command 1.

0x1EF00010

Register address Description
0x1EF000X0 Buffer physical address>>3
0x1EF000X4 Associated buffer physical address>>3
0x1EF000X8 Buffer size
0x1EF000XC The low u16 for this register is overwritten by the GX command u16 parameter

These registers are used by GX command 2. 0x1EF00010 is used for the GX command buf0 parameters, while 0x1EF00020 is used for the GX command buf1 parameters.

0x1EF00C00

Register address Description
0x1EF00C00 Buf0 physical address>>3
0x1EF00C04 Buf1 physical address>>3
0x1EF00C08 Unknown, used with cmd3
0x1EF00C0C Unknown, used with cmd3
0x1EF00C10 Unknown, used with cmd3 and cmd4
0x1EF00C14 GSP module writes value 0 here prior to writing to 0x1EF00C18, for cmd3
0x1EF00C18 Writing value 1 here triggers GPU processing for the specified buffers
0x1EF00C20 Unknown, used with cmd4
0x1EF00C24 Unknown, used with cmd4
0x1EF00C28 Unknown, used with cmd4

These registers are used by GX command 3 and 4. For cmd4, *0x1EF00C18 |= 1 is used instead of just writing value 1.

Framebuffers

Address Description
0x1EF00468 Main LCD, first framebuffer for 3D left
0x1EF0046C Main LCD, second framebuffer for 3D left
0x1EF00494 Main LCD, first framebuffer for 3D right
0x1EF00498 Main LCD, second framebuffer for 3D right
0x1EF00568 Sub LCD, first framebuffer
0x1EF0056C Sub LCD, second framebuffer

The above framebuffer registers contains the physical address for each framebuffer, normally located in FCRAM in the application's GSP heap.

These LCD framebuffers normally contain the last rendered frames from the GPU. The color format is BGR8. The framebuffers are drawn from left-to-right, instead of top-to-bottom.(Thus the beginning of the framebuffer is drawn starting at the left side of the screen)

Both of the 3D screen left/right framebuffers are displayed regardless of the 3D slider's state, normally when the 3D slider's state is set to "off" the left/right framebuffer addresses are set to the same physical address.