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Altera_Forum's avatar
Altera_Forum
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12 years ago

Porting non-mmu code to MMU -- MMU memcpy SEGV

Thanks in Advance. With the non-mmu nios2 our design defined sdram regions that we utilized for buffers in our custom device driver. **** device driver sharedMem = kmalloc( SHARED_MEMSIZE...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

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Hi,

Same major and minor# ? 240 - 204 ? Sorry, I can't understand your question.

OPPS -- they were both 240 sorry for the typo. Which bothered me because it worked but I'm opening the same driver with the same minor number - that isn't something you should do is it?

There are several ways. One is to use different minor numbers, like 0, 1, 2 etc..

Kazu

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O.K. so I can use minor# 0 for the driver and the interrupt functionality, etc. and use minor# 's 1, 2, 3, ... for my mmap areas?