When I grep 'ATA_SECT_SIZE', I can *not* find any files including the ATA_SECT_SIZE before the fsl_sata.c.
Well, the ata_piix driver for one uses it, but only includes ata.h. But that is the only one in the tree right now.
But the problem still remains, it is currently impossible to use both libata.h and ata.h.
Why need use both them? I believe the libata.h is enough.
Since my driver for the sil3114 uses "legacy mode" it uses a lot of the ata commands directly in PIO mode. These are defined in ata.h (Both in u-boot and Linux)
I believe the linux kernel happen at legacy mode same as you, but kernel can handle the legacy mode, why you can not hanlde the legacy mode in u- boot with same header file.
If you're using the I/O register descriptions and status register bits in ata.h of u-boot. the kernel header have the same register/bit definition. just like
ATA_REG_DATA ATA_REG_ERR ...
ATA_BUSY ATA_DRDY ... ATA_ERR ATA_SRST