[syslinux] Limiting memory used by syslinux

[H. Peter Anvin]

On 06/02/2012 09:28 AM, Gene Cumm wrote:
> On Jun 2, 2012 11:12 AM, "H. Peter Anvin" <hpa at zytor.com> wrote:
>>
>> On 06/01/2012 12:07 PM, jochen.desmet at emc.com wrote:
> 
>>> The problem we're having is that syslinux is overwriting some of that
>>> memory (specifically, at first glance it looks like the com32 stack). Is
>>> there a way to tell syslinux to not use memory above a certain address ?
> 
>> There isn't in the stock syslinux, but it wouldn't be hard to do; there
>> is actually a hard-coded limit of 0xfff00000 already (in two places, you
>> probably need to grep for it.)  The problem with making this
>> configurable is that it would have to happen very early on, before a lot
>> of the configuration information is available.
> 
> Wouldn't this be best done in the ADV or should it be configurable in the
> config file?
> 

Those are problematic, since they both are too late in the memory setup.

The best would of course to mark the persistent memory as unavailable in
the e820 setup.

	-hpa