uClinux on x86 disabled MMU

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Petrov Darie Contact options for registered users 's Avatar (by Gravatar) posted on
March 10, 2006, 7:10 pm
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How would I go about getting uClinux on a 486 with a disabled MMU?

It does not really have to be uClinux, but I need MMU disabled so memory
is alligned properly in my aggregate data structures. I am using the 486
to develop for the uCsimm Arcturus board which runs a Motorola
Dragonball CPU (16 bit) without MMU.
Thank you

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Damion de Soto Contact options for registered users 's Avatar (by Gravatar) posted on
March 13, 2006, 1:53 am
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Re: uClinux on x86 disabled MMU
Hi Petrov,
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Unfortunately this isn't a trivial process.
You will need to change the start-up assembler code (for your specific arch) to
not
enabled and set-up the MMU, and then also undef CONFIG_MMU in linux 2.6 (linux
2.4
has various different non/MMU config options depending on your arch).
In addition to that, you will need to go through the arch specific includes/asm
and
change things like trap support to not use the MMU.

regards,

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