On Sat, Jun 29, 2013 at 12:55 PM, Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> wrote: > On Sat, Jun 29, 2013 at 12:29:55PM -0700, Yinghai Lu wrote: >> >> On these SoCs which Santosh is working on, the main physical memory >> >> mapping is above 4GB, with just a small alias below 4GB to allow the >> >> system to boot without the MMU being on, as they may have more than >> >> 4GB of RAM. As I understand it, the small alias below 4GB is not >> >> suitable for use as a "lowmem" mapping. >> >> is that 32bit ARM or 64bit ARM? > > Only 32-bit has LPAE. Such things don't make sense on 64-bit CPUs. 32bit ARM does not support NO_BOOTMEM yet. arch/arc/Kconfig: select NO_BOOTMEM arch/arm64/Kconfig: select NO_BOOTMEM arch/sparc/Kconfig: select NO_BOOTMEM arch/x86/Kconfig:config NO_BOOTMEM so may need to 1. make 32bit ARM to use NO_BOOTMEM at first. 2 .we can add alloc_memblock as MACRO or inline for bootmem arches, 3. NO_BOOTMEM arches will have alloc_memblock in nobootmem.c 4. replace alloc_bootmem calling with alloc_memblock calling in core code. Thanks Yinghai -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
