RD94_SYS_PCI_INTMASK
out32(RD94_SYS_PCI_INTMASK, 0xf);
mask = in32(RD94_SYS_PCI_INTMASK);
out32(RD94_SYS_PCI_INTMASK, mask);
mask = in32(RD94_SYS_PCI_INTMASK);
out32(RD94_SYS_PCI_INTMASK, mask);
stat &= in32(RD94_SYS_PCI_INTMASK);