[flashrom] [PATCH] Add programmer for the MSTAR I2C ISP protocol

[Stefan Tauner]

On Mon, 9 Feb 2015 00:53:40 +0100
Idwer Vollering <vidwer at gmail.com> wrote:

> 2014-05-04 18:20 GMT+02:00 Alexandre Boeglin <alex at boeglin.org>:
> > Hi,
> >
> > Here is a patch, that provides support for the MSTAR ISP protocol.
> >
> > Basically, among other chips, MSTAR manufactures SoCs that equip TV sets
> > and computer screens, and it seems that all of their products use the
> > same in-system programming protocol. Basically, they use the DDC channel
> > of VGA or DVI connectors, which is actually an I2C bus, to encapsulate
> > SPI frames (the flash chip is connected to the SoC through an SPI bus).
> >
> > I wrote this patch since the screen I bought had a software bug, and the
> > manufacturer only released a new firmware binary, but no tool or
> > instructions on flashing it.
> >
> > More details can be found here:
> > http://boeglin.org/blog/index.php?entry=Flashing-a-BenQ-Z-series-for-free(dom)
> 
> There seems to be a silicon (=SoC) bug as well.
> 
> One can recover by rotating the original image (YOU DO HAVE BACKUPS,
> RIGHT :) ) _back_wards - the example assumes the read file is 128
> kilobyte large:
> tail -c 1 orig_read.bin > realimage.bin; head -c 131071 orig_read.bin
> >> realimage.bin; flashrom -p mstar -w realimage.bin --noverify

hm... I wonder if that is a bug in how we do it... but the write
routine looks really trivial. Maybe it would be a good idea to start a
list with monitors, SoC revisions... (whatever ID data is accessible)
that require this hack.

-- 
Kind regards/Mit freundlichen Grüßen, Stefan Tauner