Does DSB(SY) guarantee Write-combined write to be flushed?

I found the following code sequence in our code. Can I know if the following DSB(SY) guarantees that register access (#3) will be executed after contents of #1 flushed to DDR memory?

1: write value to DDR through write-combined memory mapping

2: DSB(SY)

3: direct register access

Thanks,
Owen

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