Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

The problem with custom board. (Exception access user space)

Hello everyone, I have trying to run Linux on my custom board. But, Exception occurs when you access the user space. start_kernel () is passed. kernel_init () will call the initializat...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Do you use the MMU-based or the no-MMU distribution ?

AFAIK, Futex is not (yet) implemented in the MMU based distribution, as the planned "atomic region" stuff is not yet in place.

Maybe the no-MMU distribution implements Futex (i.e. the "atomic" userland stuff) by interrupt disabling, but I am not sure about this.

-Michael