RK3568 烧录固件失败_rk3568烧写固件测试设备失败

自己开发的核心板，回板后，在maskrom模式下烧录，Test devices失败。报错如下：

烧录工具抓的LOG:

13:49:53 994  Layer<1-5>:Download Boot Start

13:49:57 637   Layer<1-5>:Download Boot Success

13:49:57 639   Layer<1-5>:Wait For Maskrom Start

13:49:58 129   Layer<1-5>:Wait For Maskrom Success

13:49:58 132   Layer<1-5>:Test Device Start

13:49:58 144   Error:RKU_Write-->WriteFile failed,bRet=0,err=31,size=31,write=0

13:50:15 202   ERROR:RKU_ResetPipe-->DeviceIoControl failed,err=31

13:50:15 203   <LAYER 1-5> ERROR:TestDevice-->RKU_TestDeviceReady failed,RetCode(-3),path=\\?\USB#VID_2207&PID_350A#5&A0FCAC8&0&5#{a5dcbf10-6530-11d2-901f-00c04fb951ed}

13:50:21 249   Error:RKU_Write-->WriteFile failed,bRet=0,err=995,size=31,write=0

13:50:23 265  ERROR:RKU_ResetPipe-->DeviceIoControl failed,err=31

13:50:23 266  <LAYER 1-5> ERROR:TestDevice-->RKU_TestDeviceReady failed,RetCode(-3),path=\\?\USB#VID_2207&PID_350A#5&A0FCAC8&0&5#{a5dcbf10-6530-11d2-901f-00c04fb951ed}

13:50:29 295  Error:RKU_Write-->WriteFile failed,bRet=0,err=995,size=31,write=0

13:50:31 309   ERROR:RKU_ResetPipe-->DeviceIoControl failed,err=31

13:50:31 311     <LAYER 1-5> ERROR:TestDevice-->RKU_TestDeviceReady failed,RetCode(-3),path=\\?\USB#VID_2207&PID_350A#5&A0FCAC8&0&5#{a5dcbf10-6530-11d2-901f-00c04fb951ed}

13:50:32 354  Error:Layer<1-5>:Test Device Fail

Log口抓到的log：

[13:49:55.009]收←◆DDR Version V1.10 20210810

In

unknown device

error

ERR

DDR焊接测试工具：

用瑞芯微的DDR焊接测试工具测试DDR，报错：DDR强制初始化失败

问题根因：VCC25_DDR电压异常，只有1.2V，强制拉到2.5V后，可以成功烧录。