GPU/External Registers

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

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.

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)

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