0x800000 is the max amount I've been able to allocate. I think it has something to do with max size allowed by dma_alloc_coherent with the GFP_KERNEL flag. The max with the beaglebone white (256mb ram instead of 512mb) was 0x400000. So far I haven't been able to turn up where these limits may be coming from though.. someone suggested it may be tunable with a kernel parameter.
On Thursday, November 7, 2013 12:32:11 AM UTC-5, [email protected] wrote: > > I'm running Angstrom (Linux 3.8.13, September 12, 2013) on a BeagleBone > Black and I've tried configuring uio_pruss to allocate a large amount of > external memory, but I have found that sizes greater than 8MB don't work > and lead to uio_pruss failure. > > The command I have been trying is: > > /sbin/modprobe uio_pruss extram_pool_sz=0x800001 > > > ... and the error message I receive is: > > pruss_uio 4a300000.pruss: Could not allocate external memory > > > I would like to allocate more than 8MB of external memory for PRU access. > Is it possible to allocate more than 8MB? If so, what can I do to make it > work? > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
