On Thu, 26 Aug 2010 07:38:26 -0500 "Guzman Lugo, Fernando" <fernando.lugo@xxxxxx> wrote: > >> due to a restriction in scatter gather lists, it can > >> not be created a list for a buffer bigger than 1MB. > >> This patch is spliting big mappings into 1MB mappings. > > > >I don't read the whole thread but the above description is incorrect. > > > >Why can't you use scatter gather chaining? You can create a scatter > >list for a buffer larger than 1MB. > > The thing is that ARM architecture does not support SG chaining. This patch should be > seen like a workaround until it is fixed in iovmm module. Fix iovmm module is easier than the workaround? >From a quick look, arch/arm/plat-omap/iovmm.c does nothing wrong about scatter gather chaining. arm/arm/mm/dma-mapping.c looks fine too about it. Maybe just defining ARCH_HAS_SG_CHAIN works? -- 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
