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uart write FW fail

Other Parts Discussed in Thread: CC2650

Hi All

uart write flash script:cc26xx-bsl.py

      cmd:cc26xx-bsl.py -p COMX -e -w -v FW.bin

FW:<OTA>bootloader + FW

<Fail>

1、我司有1100多片新品cc2650,用uart write FW有26片fail,

fail msg:ERROR: Timeout waiting for ACK/NACK after 'Get ChipID (0x28)'

2、fail pcs用flash programmer II dump出來看只有底端有幾個bytes資料是C5, C7,

而正常的pcs flash data這幾個bytes都是C5,沒有其它值

<Sol>

當uart write FW fail後,拿來用flash programmer II write一次後,uart就可以正常寫入FW了

<問題>

1、為何用script uart write會fail,而flash programmer II確正常,而且fail pcs再回來用uart write就正常了??

2、開發者應該只能寫入flash data吧,應該不會導致TI Rom boot fail吧?

3、該如何解決這個問題??