Description of problem:
There are two sections which are talking about Hard Drive installation:
In this link, "linux repo=" option is introduced like this:
Later it says that the path of ISO files should be specified, but it is not clear that 'how' you can specify the path of the ISO files. (the main pattern doesn't include path its just "hd:device"). AFAIK, the above option should be introduced as:
The "inst.repo=" for HDD installation is specified as:
I don't remember if I've tried "inst.repo=" option, but "repo=" option doesn't work as "repo=hd:device/path" but works with a colon between device and path; e.g. "repo=hd:device:path". This is what I've used to successfully boot Fedora 20's installer (I have specified .iso file but according to the documentation it should not be needed. Anyway, this worked for me):
linux /boot/vmlinuz-20 repo=hd:/dev/sda8:/tmp/Fedora-20-x86_64-DVD.iso
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Seems to be fixed in F22 guide.