[c-nsp] 1600R series router internals

[Tom Storey]

Hi Lukasz,

Interesting. I might take a little look into this, but not sure how much of
it will translate over, I presume they will be very different platforms
(there are very few similarities between the 2500 and 1600R other than the
family of CPU).

It definitely is going to be a challenge, but if you dont ask, you dont
get. :-)

On Fri, 26 Mar 2021 at 12:43, Lukasz Bromirski <lukasz at bromirski.net> wrote:

> Tom,
>
> There was a project of porting OpenWRT to 3600 routers, I
> believe you could benefit from talking to the author if he’s
> somewhere around.
>
> Can’t find the URL now, but I bet somebody will do.
>
> We can’t really share confidential information about the
> architecture - if it’s not on CCO, it would require NDA,
> and as 1600 is so old... you can imagine finding person
> willing to do that and take responsibility of sharing that
> info would be kind of a challenge.
>
> --
> ./
>
> > On 25 Mar 2021, at 18:23, Tom Storey <tom at snnap.net> wrote:
> >
> > Hi all, this is probably a long shot from far out of left field, but I
> > wonder if anyone is familiar with the deep inner workings of the 1600R
> > series routers?
> >
> > Long story short, I got a bit bored recently with all of the coronavirus
> > related restrictions, and started to reverse engineer some older model
> > Cisco routers (2500 and 1600R) that are based on Motorola 68000 family
> > CPUs, with a "no particular reason" goal of making FreeRTOS run on them
> > (achievement unlocked.)
> >
> > But the 1600R is throwing me a curve ball, and Im having difficulty
> > seemingly "unlocking" access to the memory ranges that cover the WIC slot
> > and the PCMCIA controller registers.
> >
> > Ive used Ghidra to disassemble and rummage through the factory boot ROM
> > code to figure out basically "what Cisco did", and re-implemented it
> > myself, but I still seem to be missing something. Basically, I wondered
> if
> > someone here might be familiar enough with these old boxes at a low
> enough
> > level and might know if there is something in particular that needs to be
> > poked to make this work?
> >
> > Thanks in advance!
> >
> > Tom
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