TMS570LS1224: Is there any way to erase FLASH by some kind of unit other than a sector? For example, erase 1KB or 4KB each time

For Fapi_issueAsyncCommandWithAddress()， only Fapi_EraseSector or Fapi_EraseBank can be used。When I want to rewrite a few bytes at the end of a sector of 128KB size,  I have to erase the whole sector. Then I have to copy all the 128KB data to ram in order to lose no data.So I wonder whether there is a way to work as I asked. 

regards,

Lee