If we define a memory as cached in
According to comments in android_pmem.h ,
/* set to indicate maps of this region should be cached, if a mix
of
* cached and uncached is desired, set this and open the device
with
* O_SYNC to get an uncached region */
if we want to use a mix and make some region un-cached , we can use
O_SYNC flag for that.
But I am gettign the same bahavior as cached even after using O_SYNC
flag. ( I did not evne used a mix , I just made a memory cached and
used O_SYNC flag to use it as uncached , but the behavior I got was of
cached )
In POSIX , we have 3 flags O_SYNC, O_RSYNC , O_DSYNC and Linux
actually only supports O_SYNC and Linux's O_SYNC is actually POSIX
O_DSYNC.
Is that the reason O_SYNC may not be working fine to make memory
uncached ?
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