On Tue, Aug 16, 2016 at 01:13:28PM +0100, Leif Lindholm wrote:
> Package: linux
> Version: 4.6.4-1
> X-Debbugs-CC: steve@einval.com, wookey@wookware.org, zheng.xu@linaro.org
>
> Upstream commit 211102d85 ("arm64: defconfig: enable 48-bit virtual
> addresses") changed the default configuration for arm64 to be 48-bit
> VA (CONFIG_ARM64_VA_BITS_48). This is required in order to be able to
> access the full amount of RAM available on some current arm64 systems
> (currently with large memory holes, but could apply to any system with
> >512GB of RAM). Without this, on these systems, the kernel will fail
> to access the initrd, which will have been located near top of RAM by
> GRUB. Error message given is:
> ---
> initrd not fully accessible via the linear mapping -- please check
> your bootloader ...
> ---
>
> So please enable CONFIG_ARM64_VA_BITS_48 for arm64 kernels.
>
> Note: this change _will_ cause breakage in certain userland software
> making non-portable assumptions about available of top address bits
> for pointer tagging - including luajit and mozilla-js (and hence
> everything using mozilla-js).
FTR, this is an issue DSA is having booting arm64 machine donated by
Gigabyte MR30-AR1. I am currently building a kernel, to get a d-i image
and test this proposed fix.
I'll follow up with the results.
Regards,
--
Hector Oron
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