UART chip affect the DDR test of S32G

[carolyn_zhang]

Hi,

We made our own S32G board. When we do DDR test, we found that:

1. We used FT232RL, DDR test passed.
2. We used CH340B, DDR test are unstable, sometimes succed, sometimes failed, about fifty fifty. When failed, the log showed 'error-odd-length-string'
3. We used CP2102, DDR test failed,  the log showed 'Exception: The serial connection has communication issues.'

Could somebody give me some advices about this? Is it the bug of the DDR test tool? Thanks.