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Does Linux require an MMU?
If you want to use Linux, you need to have an MMU. Most real-time operating systems [RTOSes] do not use process model. They use thread model, where logical and physical addresses are identical. So, an MMU is not required.
What is the purpose of the MMU?
A memory management unit (MMU) is a computer hardware component that handles all memory and caching operations associated with the processor. In other words, the MMU is responsible for all aspects of memory management.
What is the need of MMU?
A memory management unit (MMU) is a computer hardware component that handles all memory and caching operations associated with the processor. OS (operating system) memory management, which ensures the availability of adequate memory resources for the objects and data structures of each running program at all times.
Is the Linux kernel compiled with no MMU?
In case this wasn’t clear, normal Linux systems need an MMU. The Linux kernel can be compiled for systems with no MMU, but this introduces restrictions that prevent a lot of programs from running. Start by reading No-MMU memory mapping support.
Which is an example of a no MMU file?
In the MMU case: As for ordinary regular files. In the no-MMU case: The character device driver may choose to honour the mmap () by providing direct access to the underlying device if it provides memory or quasi-memory that can be accessed directly. Examples of such are frame buffers and flash devices.
How does no MMU work in a VM?
In the no-MMU case: VM regions backed by arbitrary contiguous runs of pages. These behave very much like private mappings, except that they’re shared across fork () or clone () without CLONE_VM in the MMU case. Since the no-MMU case doesn’t support these, behaviour is identical to MAP_PRIVATE there.
How to enable MMU support in Arch Linux?
Alternatively, you can make the option appear in the menu by editing the file in arch/*/Kconfig corresponding to your architecture and replacing the stanza starting with CONFIG MMU by config MMU bool “MMU support” default y —help— Say yes. If you say no, most programs won’t run.