[Coco] MOOH cartridge dual boot demo

[Tormod Volden]

Alex, no worries :) I get a fuller picture now, thanks. We will figure
it out. I'd suggest I first send you a prepared and tested SD card,
and if that doesn't work we'll replace the board. In the meantime I
cannot come up with any possible explanation why everything works fine
as far as reading is concerned, but writing fails. Only that some SD
cards use a lot more current when writing, but there should be plenty
of headroom for that. For your information the MMU part works
independently of the SPI interface which the SD card is hooked up to.

Regards,
Tormod


On Mon, Apr 29, 2019 at 10:22 AM Alex Evans <varmfskii at gmail.com> wrote:
>
> P.S. If I came across as a bit brusque, that was not may intent.  The
> suggestions are appreciated, just given the full picture (which you
> didn't have), they aren't particularly useful.
>
> On Mon, Apr 29, 2019 at 1:47 AM Tormod Volden <lists.tormod at gmail.com> wrote:
> >
> > On Mon, Apr 29, 2019 at 7:11 AM Alex Evans wrote:
> > >
> > > What are you using for an SD card? I have tried several and the result is
> > > always the same. I can boot into either FUZIX or Nitros9, but the first
> > > write to the file system.corrupts the card.
> > >
> >
> > Any SDHC card between 4GB and 32GB should work fine. Also non-SDHC
> > cards (2GB and lower) should work too, but I haven't tested that as
> > much. I use Kingston cards and never had any issues with them,
> > otherwise Sandisk is generally recognized as a good brand with quality
> > cards.
> >
> > Note that FUZIX requires you to unmount the file system cleanly before
> > powering off. The recommended way is by running:
> >  telinit 6
> > and wait until it displays "Halted.". If not, you will be prompted to
> > do run a file system check (fsck) the next time it boots up, and this
> > takes forever so you really don't want to do that. These are
> > "features" of FUZIX (and many old UNIX systems).
> >
> > It has nothing to do with 256 versus 512 bytes sectors, because the
> > NitrOS-9 system uses the rbsuper high-level driver to convert sectors.
> >
> > Regards,
> > Tormod
> >
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>
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