Loading Modules in Ubuntu

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Very early versions of Linux had all the necessary kernel drivers compiled into the kernel. This meant that the kernel knew exactly what was supported. If you needed to add a new device, you would need to compile a new kernel. Unfortunately, including every driver in the kernel led to a big problem: the kernel became too large. Back in the days of floppy disks, it would take two 1.44-MB disks to boot Linux—one for the kernel and the other for the rest of the operating system. The kernel developers introduced compressed kernels, but even those became too large for floppy disks.

Fortunately, the barbaric days of compiling all desired modules into the kernel are long gone. Today, Linux uses loadable kernel modules (LKMs). Each LKM can be placed in the kernel as needed. This keeps the kernel small and fast. Some LKMs can even perform a check to see if they are required. If you don’t have a SCSI card on your computer, then the SCSI LKM driver won’t load and won’t consume kernel resources. Usually, hardware is found through device identifiers, but sometimes you need to tell the operating system to enable the device.

Ubuntu includes a healthy selection of common and uncommon kernel modules. If the device has any type of stable Linux support, then it is very likely that Ubuntu has the LKM on the system.

Source of Information : Wiley Ubuntu Powerful Hacks And Customizations

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