NVRAM_SWARB
tw32(NVRAM_SWARB, SWARB_REQ_SET1);
if (tr32(NVRAM_SWARB) & SWARB_GNT1)
tw32(NVRAM_SWARB, SWARB_REQ_SET1);
if (tr32(NVRAM_SWARB) & SWARB_GNT1)
tw32(NVRAM_SWARB, SWARB_REQ_CLR1);
tw32(NVRAM_SWARB, 0x20);