Hi, this probably belongs on android-porting. That said, "application access to hardware registers" is pretty much a no, never, not on your life.
On Wed, Nov 4, 2009 at 8:33 AM, Manu <[email protected]> wrote: > I am designing an application on Android that needs to access hardware > registers from user space. The application is integrated to external/ > skia. First, I have to determine the virtual address of my hardware by > doing a device open("/dev/mem", O_RDWR|O_SYNC) followed by a mmap(...) > > Linux-2.6.29-dirty > Android Volume Deamon version 2.0 > > Issue: > The open() operation is failing with a EACCES(13) error: I dont have > permission. > > Observation1: > I have noticed config files having the following flags: > CONFIG_DEVMEM > CONFIG_STRICT_DEVMEM > in Kconfig.debug in kernel/arch/x86 and in other places (generated > files). > > Observation2: > I also tried to alter the AndroidManifest.xml for my application > (Camera) to add a permission called "HARDWARE_TEST". The > PackageManager rejected the permission at start-up. > > Observation3: > When my application was a standalone executable that I invoked from > the shell, I did not have that problem. > > Questions: > 1. What are the rules behind permission to open the mem device ? > 2. What is the usage of the config flags related to DEVMEM and can > they help me? > 3. Where is the master config file that generates all the generated > files? > 4. Is there anything I can do via the permission inside the xml > manifests ? > > Thanks, > > Manu > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected]<android-developers%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- Dianne Hackborn Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
