This would just temporarily delay the problem. People have even tried with values of 14 MB and all. Nishant M knows one such recent issue.
Bye the way use of this macro for general DMAable memory is discouraged. You can find many threads on ARM mailing list. Regards, Santosh > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of pramod gurav > Sent: Wednesday, April 22, 2009 3:14 PM > To: Gupta, Ramesh > Cc: Menon, Nishanth; [email protected] > Subject: Re: dma_alloc_coherent fragmentation > > Hi Ramesh, > This worked. Thanks a lot. > > > -- > Best Regards > Pramod > > > On Wed, Apr 22, 2009 at 2:44 PM, Gupta, Ramesh <[email protected]> wrote: > > Hi Pramod, > > > > > >> -----Original Message----- > >> From: [email protected] > >> [mailto:[email protected]] On Behalf Of pramod gurav > >> Sent: Wednesday, April 22, 2009 1:17 PM > >> To: Menon, Nishanth > >> Cc: [email protected] > >> 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/[email protected]/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 [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
