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CONFIG_BLK_DEV_OFFBOARD: Boot off-board chipsets first support

General informations

The Linux kernel configuration item CONFIG_BLK_DEV_OFFBOARD has multiple definitions:

Boot off-board chipsets first support (DEPRECATED) found in drivers/ide/Kconfig

The configuration item CONFIG_BLK_DEV_OFFBOARD:

Help text

Normally, IDE controllers built into the motherboard (on-board controllers) are assigned to ide0 and ide1 while those on add-in PCI cards (off-board controllers) are relegated to ide2 and ide3. Answering Y here will allow you to reverse the situation, with off-board controllers on ide0/1 and on-board controllers on ide2/3. This can improve the usability of some boot managers such as lilo when booting from a drive on an off-board controller.

Note that, if you do this, the order of the hd* devices will be rearranged which may require modification of fstab and other files.

Please also note that this method of assuring stable naming of IDE devices is unreliable and use other means for achieving it (i.e. udev).

If in doubt, say N.

Boot off-board chipsets first support found in drivers/ide/Kconfig

The configuration item CONFIG_BLK_DEV_OFFBOARD:

Help text

Normally, IDE controllers built into the motherboard (on-board controllers) are assigned to ide0 and ide1 while those on add-in PCI cards (off-board controllers) are relegated to ide2 and ide3. Answering Y here will allow you to reverse the situation, with off-board controllers on ide0/1 and on-board controllers on ide2/3. This can improve the usability of some boot managers such as lilo when booting from a drive on an off-board controller.

If you say Y here, and you actually want to reverse the device scan order as explained above, you also need to issue the kernel command line option "ide=reverse". (Try "man bootparam" or see the documentation of your boot loader (lilo or loadlin) about how to pass options to the kernel at boot time.)

Note that, if you do this, the order of the hd* devices will be rearranged which may require modification of fstab and other files.

If in doubt, say N.

Hardware

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