[Coco] Nitros9 users: How big are your OS9BOOTS ?

[Brett Gordon]

Gene:  I'm not to horribly worried about the run-time size of memory
required by Nitros9, rather,  just it's pre-initialization requirement and
before any sysram is allocated.  I'm basically just interested in the
actual size (in bytes) of a typical, real-life OS9BOOT file.

Sincerely,

Brett


On Mon, Sep 9, 2013 at 3:22 PM, Gene Heskett <gheskett at wdtv.com> wrote:

> On Monday 09 September 2013 15:02:11 Brett Gordon did opine:
>
> > Hey Nitros users:  I wanted to do a quick suvey to find out how big your
> > OS9BOOT files are.   I see the stock Nitros9 builds are max 27k.   My
> > new-new cocoboot will be loading Nitros9 modules one-at-a-time but will
> > only allow bootfiles that are 32k-ish in size.
> >
> > https://sites.google.com/site/cocoboot2/home/nitros9booting
> >
> > for more info
> >
> > thanks in advance,
>
> Boot size seems to be more related to how much memory the list of drivers
> in the boot needs.  When the sysram has been allocated, and no more exists,
> then the boot fails.
>
> Before the Great rewrite that split up the drivers into subparts, I once
> had a working boot, using a wp-rs as a 2nd monitor driver that totalled a
> hair short of 37k.
>
> Now, with the drivers broken up, each needing its own buffer, I am out of
> sysram at around 33-34k.
>
> Level 3 was designed to help that situation by segregating the rbf buffers
> from the scf buffers, giving each its own separate from the sysram working
> area, similar to what grfdrv does now I believe, but I suspect the dw stuff
> will need to be split out such that the scf functions are in one module,
> and the rbf functions in a separate module such that each can live happily
> in its own memory.  So a working level 3 drivewire boot probably isn't
> going to happen until such time as those conditions are satisfied.
> Properly 'segregated', I can see a level 3 boot that might push past the
> 40k marker.
>
> Done right, we'd need another $10 to $18 bytes of DP memory to keep track
> of all the gime maps we'd need to update at a context switch.  Unforch,
> that will not be easy, and will likely break lots of stuff we use now that
> were built with the old DP defs.  There be dragons...
>
> Cheers, Gene
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-- 
Brett M. Gordon,
beretta42 at gmail.com