cvs commit: src/sys/boot/i386/loader main.c

[John Baldwin]

On Monday 19 December 2005 01:32 pm, Maxim Sobolev wrote:
> John Baldwin wrote:
> > On Monday 19 December 2005 04:26 am, Maxim Sobolev wrote:
> >> sobomax     2005-12-19 09:26:42 UTC
> >>
> >>   FreeBSD src repository
> >>
> >>   Modified files:
> >>     sys/boot/i386/loader main.c
> >>   Log:
> >>   If LOADER_BZIP2_SUPPORT is defined allocate heap in the 1MB-4MB range
> >> to provide enough room for decompression (up to 2.5MB is necessary).
> >> This should be safe to do since we load i386 kernels after 8MB mark now,
> >> so that 16MB is the minimum amount of RAM necessary to even boot
> >> FreeBSD.
> >
> > Err, I thought we loaded PAE kernels at 2MB and non-PAE kernels at 4MB to
> > skip the first PSE page (PSE pages are 2MB on PAE).
>
> You are right, my mistake, sorry. In any case memory in the range
> 1MB-4MB can be used by default.

Errm, no it can't.  PAE kernels (and amd64 kernels I think) are both loaded at 
2MB, so that only leaves memory in the range 1MB-2MB.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org