mmGCMC_VM_FB_LOCATION_BASE
u64 base = RREG32_SOC15(GC, 0, mmGCMC_VM_FB_LOCATION_BASE);
u64 base = RREG32_SOC15(GC, 0, mmGCMC_VM_FB_LOCATION_BASE);
WREG32_SOC15(GC, 0, mmGCMC_VM_FB_LOCATION_BASE,
WREG32_SOC15(GC, 0, mmGCMC_VM_FB_LOCATION_BASE, adev->gmc.vram_start >> 24);