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*** The New `cdrom' Command Syntax ***
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1. Initialize the ATAPI CDROM devices:
grub> cdrom --init
This will display the number of atapi cdroms found: atapi_dev_count
2. Stop the ATAPI CDROM devices:
grub> cdrom --stop
This will set atapi_dev_count to 0.
3. Add IO ports for searching the atapi cdrom devices. For example:
grub> cdrom --add-io-ports=0x03F601F0
After running `cdrom --init' and `map --hook', the cdroms can be accessed
through devices (cd0), (cd1), ...
Note 1: If the system does not fully support the ATAPI CD-ROM specifications,
you will encounter failure when trying to access the (cdX) devices.
Note 2: After doing a `cdrom --stop', you should do a `map --unhook'. Of
course you may `map --hook' again if there are mapped drives.
Note 3: After adding IO ports, you should do a `map --unhook' followed by a
`cdrom --init' and then followed by a `map --hook'.
By default, these ports are used for searching cdroms(so they needn't
be added):
0x03F601F0, 0x03760170, 0x02F600F0,
0x03860180, 0x6F006B00, 0x77007300.
Note 4: The BIOS might have offered a cdrom interface. It would be (cd). After
`cdrom --init' and `map --hook', we might have our (cd0), (cd1), ...
available. It is likely that one of them could access the same media
as the BIOS-offered (cd).
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