how to enable cache flushes for hard disk?

[kaimi]

hi,all
    I want to enable cache flushes for my hd on s3c2410 & linux-2.6.20,
ide_id_has_flush_cache() return 0 because cfs_enable_2 is 0x201, while it
needs 0x3000, I found out that 0x201 was from 512 bytes of id
info,implemented in static void ata_input_data(ide_drive_t *drive, void
*buffer, u32 wcount)
the question is, does it mean my hd does not support cache flush on hw
layer? if not, how to enable?
thanks for the coming help!

Rgrds
Kaimi
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