Warning: DQ5 raised

[HS8JCV]

Hi all
I use nor flash of SST39VF3201.
I create 3 partition.
Last partition size 256K.and map to jffs2.img(size 256K)
After I mount it.(mount -t jffs2 /dev/mtdblock/3 /flashdisk).
I got this message.

ash was programming.
Internal flash device timeout occurred or write operation was performed while fl
ash was programming.
Internal flash device timeout occurred or write operation was
performed while flash was programming.
Warning: DQ5 raised while program operation was in progress, however
operation completed OK
Internal flash device timeout occurred or write operation was
performed while flash was programming.
Internal flash device timeout occurred or write operation was
performed while flash was programming.

I can read/write this partition.
but,I still got this message.

How to fix it?

Thank you for advantage
Mr.X