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 changes to 0x181e6000, framebuffer
0x1EF0046C = 0x18300000, later changes to 0x18273000, framebuffer
0x1EF00494 = 0x18300000
0x1EF00498 = 0x18300000
0x1EF00478 = 1, doesn't stay 1, read as 0
0x1EF00474 = 0x10501

0x1EF00X90

This register controls how the LCD framebuffer is displayed.

Framebuffers

The GSP module DMAs LCD framebuffers from the GSP module heap in FCRAM into VRAM. These 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)