BRCMNAND_CS_XOR
ctrl->nand_cs_nand_xor = brcmnand_read_reg(ctrl, BRCMNAND_CS_XOR);
brcmnand_write_reg(ctrl, BRCMNAND_CS_XOR, ctrl->nand_cs_nand_xor);
brcmnand_rmw_reg(ctrl, BRCMNAND_CS_XOR, 0xff, 0, 0);
[BRCMNAND_CS_XOR] = 0x18,
[BRCMNAND_CS_XOR] = 0x18,
[BRCMNAND_CS_XOR] = 0x18,
[BRCMNAND_CS_XOR] = 0x1c,
[BRCMNAND_CS_XOR] = 0x1c,
[BRCMNAND_CS_XOR] = 0x1c,