read only

[Paonia Ezrine]

> 
> paonia at home.welcomehome.org said:
> > I am looking to use the DOC or similar with lrp. Is there a way to set
> > the device to read only mode so that no one can hack with it. I dont
> > mean a software setting but a hardware one. Also which DOC or similar
> > would people project for this application. Porlby need 2-20 megs. 
> 
> Not in hardware AFAIK - at least not simply by cutting control lines - 
> you'd have to have some intelligence in between your system bus and the 
> DiskOnChip. (logic: when the host writes to location 0x1004 in the device, 
> you ensure that bit 3 (WP) is _always_ set - mask it in if the host didn't 
> set it.)
> 
> However, it's quite feasible to cut out the write capability in the device
> driver, so that an attacker would have to load his own driver for it if he 
> wanted to write to it. That would probably be enough for your purposes.
> 
> I've been intending to do that for a while now anyway - as it would mean I
> could mark the write support as experimental.
> 
> In fact, read-only support is all I'd really want people to use the MTD 
> DiskOnChip driver for right now.
> 
> --
> dwmw2
> 
> 
I am not sure how I would update the image then. And also garentee that
noone else can. 
Thanks
Paonia



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