RADEON_PCIE_TX_GART_END_LO
WREG32_PCIE(RADEON_PCIE_TX_GART_END_LO, tmp);
WREG32_PCIE(RADEON_PCIE_TX_GART_END_LO, 0);
tmp = RREG32_PCIE(RADEON_PCIE_TX_GART_END_LO);