OFFSET_SPICMD
writeb(op->cmd.opcode, reg_base + OFFSET_SPICMD);
writeb(op->cmd.opcode, reg_base + OFFSET_SPICMD);
writeb(0x55, reg_base + OFFSET_SPICMD);
writeb(0xaa, reg_base + OFFSET_SPICMD);
writeb(op->cmd.opcode, reg_base + OFFSET_SPICMD);