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Old 28th September 2008
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jggimi jggimi is offline
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Join Date: May 2008
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This is not possible without modifying the kernel source code. And even then, it is only a theoretical possibility. This is because the root filesystem is pre-mounted as "root_device" by the kernel, prior to starting init(8).

You can, however, make the root filesystem physically read-only. Many users have done this over the years. For read-only IDE/ATA or SCSI attached devices, only /etc/rc need be modified. For an optical root device, the kernel will need a custom configuration, too.
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