Hi Pramod, > -----Original Message----- > From: linux-omap-owner@xxxxxxxxxxxxxxx > [mailto:linux-omap-owner@xxxxxxxxxxxxxxx] On Behalf Of pramod gurav > Sent: Wednesday, April 22, 2009 1:17 PM > To: Menon, Nishanth > Cc: linux-omap@xxxxxxxxxxxxxxx > Subject: Re: dma_alloc_coherent fragmentation > > Hi Nishant, > I am facing the same problem to allocate a chunk of 4MB on omap3evm > using dma_alloc_coherent. I used the test driver mentioned here > http://www.mail-archive.com/linux-omap@xxxxxxxxxxxxxxx/msg11074.html > > I applied the patch for > ioremap(24f11ec001920f1cfaeeed8e8b55725d900bbb56) suggested by > Russell, but stiill seeing the error saying > > coherent allocation too big (requested 0x400000 mask 0xffffffff) > alloc[0] - virt=0x00000000 phy=0xFFFFFFFF size=0x00400000 > Allocation failed idx=0 > insmod: cannot insert `dummy.ko': Cannot allocate memory (-1): Cannot > allocate memory > > I changed the GFP_KERNEL to GFP_TEMPORARY and also to (GFP_KERNEL | > __GFP_RECLAIMABLE), but failed to insmod the module. > I am working on linux-omap 2.6.28 kernel. Even I could not allocate > memory size greater than 1MB. > Has this been fixed? Are there any patches to fix this issue? > What is the value for 'CONFIG_FB_OMAP_CONSISTENT_DMA_SIZE' (default is 2 in omap_3430sdp_defconfig), Can you please try increasing to 8? Regards Ramesh Gupta G -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
