it's intentional (read linux/drivers/scsi/Config.in).
CONFIG_SCSI_NCR53C8XX can only be selected if CONFIG_SCSI_NCR53C7xx is
*not* selected; it's not possible to use both drivers at once.
try to deselect CONFIG_SCSI_NCR53C7xx ...
with "make xconfig" this is a bit more obvious since it still shows
the new NCR driver but you also can't select it as long as the old one
is selected.
Harald
--
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Harald Koenig, \/\/\/\/\/\/\/\/\/
Inst.f.Theoret.Astrophysik // / \\ \
koenig@tat.physik.uni-tuebingen.de ^^^^^ ^^^^^