Searching Internet, I found an operating system called uclinux which can run on ARM Cortex-M7. How is it different from the orginal Linux which runs on PC?? What about librarys such as QT GUI? Is it possible to run GUI programs base on QT on uclinux?? (Please answer more specifically about stm32f746g discovery board)
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1\$\begingroup\$ Search the Internet again, please ! \$\endgroup\$– Long PhamCommented May 16, 2018 at 15:23
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\$\begingroup\$ I have searched Internet alot but I could not find technical information. \$\endgroup\$– Mehran MemarnejadCommented May 16, 2018 at 15:28
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\$\begingroup\$ Look at it's homepage. \$\endgroup\$– Long PhamCommented May 16, 2018 at 15:36
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As answered by its homepage, or its wikipedia page:
μClinux is a variation of the Linux kernel, previously maintained as a fork, that targets microcontrollers without a memory management unit (MMU).
There is no difference at this point. It's just a layer that handled memory management for a device that did not have it, particularly micro controllers.
QT will work with uclinux, just google uclinux QT or stm32f746g qt for various examples.
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\$\begingroup\$ I read about MMU. But is it the only difference between uclinux and Linux?? \$\endgroup\$ Commented May 16, 2018 at 17:24
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\$\begingroup\$ What about QT? Does it run on uclinux or it runs on bate metal? \$\endgroup\$ Commented May 16, 2018 at 17:25
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\$\begingroup\$ You should understand that there are ramifications to running without an MMU. For example, launching a program will be slower due to final relocation having to be done at that time instead of at link time. Also, multiple processes running the same executable will take more memory due to not being able to share copy-on-write pages. Finally, there is no protection from crashing the OS due to an errant memory write. \$\endgroup\$ Commented May 16, 2018 at 17:44
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\$\begingroup\$ By difference, I do not mean any side effect caused by MMU. I mean do we have user and kernel mode? Am I able to use the same systemcalls?? Can I write device drivers just like the linux one?? And things like this... \$\endgroup\$ Commented May 16, 2018 at 17:58