ACX_REG_ECPU_CONTROL
cpu_ctrl = wl1251_reg_read32(wl, ACX_REG_ECPU_CONTROL);
wl1251_reg_write32(wl, ACX_REG_ECPU_CONTROL, cpu_ctrl);
wl1251_reg_write32(wl, ACX_REG_ECPU_CONTROL, ECPU_CONTROL_HALT);
boot_data = wl1251_reg_read32(wl, ACX_REG_ECPU_CONTROL);
[ACX_REG_ECPU_CONTROL] = (REGISTERS_BASE + 0x0804)