Compile error on IDE Power Mac driver

I am still trying to install Gentoo on a G4 iMac from the 
universal-ppc-2005.1 disk (kernel 2.6.12-gentoo-r6), and I keep getting 
this error message:

VFS: Cannot open root device "hda15" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing:VFS:unable to mount root fs on unknown-block(0,0)

I read on the web that this might be due to some disks being misnamed 
and read in the wrong order; a suggested solution was to activate the 
options config BLK_DEV_IDE_PMAC (Builtin PowerMac IDE support) and 
config BLK_DEV_IDE_PMAC_ATA100FIRST (Probe internal ATA/100 (Kauai) first).

I wanted to try this and configured the kernel accordingly; but then I 
got a compile error:

CC drivers/ide/ppc/pmac.o
drivers/ide/ppc/pmac.c: In function 'pmac_ide_setup_dma'
2174 error: '__ide_dma_off_quietly' undeclared
2175 error: '__ide_dma_on' undeclared
2184 error: '__ide_dma_timeout' undeclared
make[2]: ***[drivers/ide/ppc/pmac.o] Error 1
make[1]: ***[drivers/ide] Error 2
make: ***[drivers] Error 2

I looked at pmac.c, but I saw nothing obvious; is it a known error that 
one could correct, or is perhaps a patch available?

Apart from that, what is the idea worth?

Charles



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