Hello, everyone. This is the problem: our SCSI disk with FreeBSD 4.8
on it has been failing recently, so I copied its root partition to a
fresh IDE disk with cp -pR and

You should use dump and restore to copy the root partition, see:

I'd done that before trying cp -pR, as outlined by rse@:

dump -L -0 -f- /old | (cd /new && restore -r -v -f-)
http://people.freebsd.org/~rse/mirror/

which isn't too different. I think I know what the problem is: I made the new single slice and FreeBSD partition on it and ran newfs -U on it using the latest FreeBSD 5.x livecd toolkit, and later 4.8 can't even mount that partition (mount /dev/ad0s1a /mnt) failing with "incorrect superblock", so I think its /boot/loader can't load the kernel because of FS issues (but strangely enough pressing "?" at the boot loader prompt lists directory entries of the root FS just fine). It turns out UFS isn't upwards compatible from releases 4.8 -> 5.5. I'll try running newfs -U from 4.8. Last time I checked many 4.8 binaries couldn't run due to disk errors, I hope newfs runs ok...
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