Messages in this thread | | | Date | Sat, 29 Jun 2013 13:08:13 -0700 | Subject | Re: [PATCH] WIP: HACK: LPAE, BOOTMEM and NO_BOOTMEM | From | Yinghai Lu <> |
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On Sat, Jun 29, 2013 at 12:55 PM, Russell King - ARM Linux <linux@arm.linux.org.uk> 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
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