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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

Hi,

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I've "THINK" I have properly requested four minor numbers for my driver.

When I open "/dev/mine1" and try and do the mmap from user space the mmap function IS NOT entered!!

So, I'm figuring I have done something incorrectly when doing the cdev_add and the driver funtions are not properly being pointed to --- but it looks like what Rubini has...

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What error code does the 'mmap' return ? It seems that you can open "/dev/mine1", so please check it in your function 'mine_open'.

Kazu