You can have them both compiled into the kernel as long as you have a
'hdx=ide-scsi' line in your bootloader config.
I've built scsi-cdrom support and scsi emulation into the kernel
(gentoo-sources-2.4.20-r1) and don't know what else I could do. This
was working with a previous gentoo install but it isn't anymore.
A dmesg|grep hdd gives
----
Kernel command line: root=/dev/hda3 hdd=ide-scsi vga=0x31A
ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:DMA, hdd:DMA
hdd: _NEC DVD+RW ND-1100A, ATAPI CD/DVD-ROM drive
hdd: ATAPI 40X DVD-ROM CD-R/RW drive, 2048kB Cache, UDMA(33)
----
I've found that it won't work with both ide-scsi and ide-cdrom built
into the kernel. I have no ide-cdrom support built in nor as a module
and no hdx=ide-scsi in grub.conf. This works fine for me.
--
Andrew Gaffney
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