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Re: preliminary patch for initrd support in Mach


From: Carl Fredrik Hammar
Subject: Re: preliminary patch for initrd support in Mach
Date: Mon, 14 Jun 2010 10:22:26 +0200
User-agent: Mutt/1.5.20 (2009-06-14)

Hi,

On Mon, Jun 14, 2010 at 09:00:05AM +0200, address@hidden wrote:
> > or that modifying Mach for this purpose is misguided and should be
> > avoided (for instance by embedding the initrd in a dedicated section
> > of an elf module).
> 
> Hm... I don't remember this variont actually being mentioned on IRC --
> but I think it indeed was brought up in the original discussion on the
> list a couple of months ago.

It was discussed recently on IRC by Sergio and Samuel (don't remember
when, exactly, perhaps it was after this thread was posted).  Samuel's
main objection to this idea is that it requires a new utility to pack
images into ELF files.

I agree, because not only does it complicate things short term with
additional differences to how initrd is generated on Linux (I might
be overstating this, I'm not familiar with the details), it also makes
it impossible to generate images from systems which doesn't have this
utility.

> Also, having the initrd implementation in a userspace process will
> require some changes in the bootstrap process... OTOH, these will be
> necessary for userspace drivers anyways.

I believe these two things are enough not to consider any such approach
at this time, though we might want to reconsider once such changes are
in place. 

(For instance, it might be possible to make Mach create a task without
thread if it can't execute the image, then you could just read this task
with the task store if you know its PID.)

Regards,
  Fredrik



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