svn commit: r287934 - head/sys/boot/efi/loader

[John Baldwin]

On Thursday, September 17, 2015 10:30:15 PM Bjoern A. Zeeb wrote:
> 
> > On 17 Sep 2015, at 20:43 , John Baldwin <jhb at freebsd.org> wrote:
> > 
> > On Thursday, September 17, 2015 08:36:47 PM John Baldwin wrote:
> >> Author: jhb
> >> Date: Thu Sep 17 20:36:46 2015
> >> New Revision: 287934
> >> URL: https://svnweb.freebsd.org/changeset/base/287934
> >> 
> >> Log:
> >>  The EFI boot loader allocates a single chunk of contiguous memory to
> >>  hold the kernel, modules, and any other loaded data.  This memory block
> >>  is relocated to the kernel's expected location during the transfer of
> >>  control from the loader to the kernel.
> >> 
> >>  The GENERIC kernel on amd64 has recently grown such that a kernel + zfs.ko
> >>  no longer fits in the default staging size.  Bump the default size from
> >>  32MB to 48MB to provide more breathing room.
> > 
> > I believe that this should work fine for any system with 64MB of RAM.  One
> > downside of the static size is that the loader fails if it can't allocate
> > a contiguous staging size (it isn't able to grow the staging area on
> > demand).
> 
> how do md_images work in that case?

The md_image has to fit into the same staging area (kernel plus any other
files loaded by the loader including modules and md_images all have to fit
in the staging area).  That was the original motivation for making the
staging area a build-time tunable rather than always hardcoded at 32MB so
that people who wished to deploy a large md_image can use a make flag to
build a loader with a larger staging size (I tested this with a 200+MB
mfsroot).

-- 
John Baldwin