Soliciting opinions on an extension of the bootinfo structure

John Baldwin jhb at
Fri Sep 9 12:32:23 UTC 2011

On Thursday, September 08, 2011 6:48:19 pm Peter Wemm wrote:
> On Thu, Sep 8, 2011 at 3:25 PM, Peter Grehan <grehan at> wrote:
> >> I'm proposing an extension framework for the bootinfo structure used
> >> to pass information from the bootstrap/loader to the kernel. Although
> >> I'm only proposing this for the MIPS bootinfo, it's completely
> >> applicable to any of them.
> >>
> >> What I propose is adding an optional platform extension structure:
> >> bootinfo_pext, surrounded by #ifdef BOOTINFO_PEXT
> >
> >  Any reason not to put the vendor bits into another piece of loader 
> > ? That seems the extensible way to add additional info from the loader,
> > rather than extending bootinfo (as was the case pre-loader days).
> >
> > later,
> It sounds like they're not using loader, which is probably a
> reasonable thing for their environment.

That doesn't stop you from adding metadata to the kernel.  It is just an array 
of variable length blobs appended after 'end'.  Any boot loader can support
adding metadata.

John Baldwin

More information about the freebsd-hackers mailing list