[c-nsp] 1600R series router internals

[Lukasz Bromirski]

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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