在mcsdk上有uboot.bin 直接用aisgen成成ais文件。
1/用串口只烧录uboot， 那个specific entrypoint应该是什么地址？，板卡上有DD2
（ubootais文件有300多k）
2/用uarthost 进行 烧写，到后面就错误是什么原因？
(File IO): Read 356208 bytes from file C:\AISgen_d800k008_Install_v1.13\AISgen for D800K008\u-bootsourse.bin.
(Serial Port): Opening COM3 at 115200 baud...
(AIS Parse): Read magic word 0x41504954.
(AIS Parse): Waiting for BOOTME... (power on or reset target now)
(AIS Parse): BOOTME received!
(AIS Parse): Performing Start-Word Sync...
(AIS Parse): Performing Ping Opcode Sync...
(AIS Parse): Processing command 0: 0x5853590D.
(AIS Parse): Performing Opcode Sync...
(AIS Parse): Executing function...
(AIS Parse): Processing command 1: 0x5853590D.
(AIS Parse): Performing Opcode Sync...
(AIS Parse): Executing function...
(AIS Parse): Processing command 2: 0x58535901.
(AIS Parse): Performing Opcode Sync...
(AIS Parse): Loading section...
(AIS Parse): Loaded 356124-Byte section to address 0xC1080000.
(AIS Parse): Processing command 3: 0x58535906.
(AIS Parse): Performing Opcode Sync...
(Serial Port): Read error: 操作已超时。
(AIS Parse): I/O Error in read!
(Serial Port): Read error: 操作已超时。
(AIS Parse): I/O Error in read!
(Serial Port): Read error: 操作已超时。
(AIS Parse): I/O Error in read!
(Serial Port): Read error: 操作已超时。
(AIS Parse): I/O Error in read!
(Serial Port): Read error: 操作已超时。
(AIS Parse): I/O Error in read!
(Serial Port): Read error: 操作已超时。
(AIS Parse): I/O Error in read!
(Serial Port): Read error: 操作已超时。
(AIS Parse): I/O Error in read!
(Serial Port): Read error: 操作已超时。
(AIS Parse): I/O Error in read!
(Serial Port): Read error: 操作已超时。
(AIS Parse): I/O Error in read!
(Serial Port): Read error: 操作已超时。
(AIS Parse): I/O Error in read!
(Serial Port): Read error: 操作已超时。
(AIS Parse): I/O Error in read!
(AIS Parse): Opcode Sync failed after 11 consecutive I/O failures.
(AIS Parse): Boot aborted.
(Serial Port): Closing COM3.
