Subject: Re: coldfire port of NetBSD?
To: Brian Baird <firstname.lastname@example.org>
From: Andrew Gillham <email@example.com>
Date: 09/12/2000 23:17:03
Brian Baird writes:
> I'm pretty sure that Cisco 25xx routers have 20MHz 68030's in them,
> not Coldfire's. In fact I can't offhand think of any Cisco routers
> that have coldfires:
> Cisco 1000/1400 Mot 68360 (Dragonball)
> Cisco 2500 Mot 68030
CPU Moto MC68EC30FE25C (25Mhz or underclocked to 20Mhz?)
Ether AMD AM79C90JC (+ AM7992BJC?)
Async Moto MC2681FN
Sync Hitachi HD64570F
> Cisco 1600/1700/2600 Mot MPC860 (ppc)
> Cisco 3000 PPC of some kind
The 3000 (or "IGS") has a 68EC030 like the 2500.
> Cisco 3600 R4700/RM5271 (mips)
CPU Orion SDT79R4700-80MS
Async National? PC16552DV
PCI Galileo GT-64010A-B-0
PCMCIA Cirrus Logic, CL-PD6729-QC-C
ARB?? Altera, EPM7032LC44-7
REG?? Altera, EPF8452AQC160-4
IO?? Altera, EPM7032LC44-12
network module: (PCI of some format? PMC?)
Ether AMD AM79C970AKC
Bridge? Xilinx, XC4013E
With a PCCARD SCSI adapter this might be nice. :-)
> Cisco 4000 R4400? (mips)
The 4000 is a 68EC030 (socketed?) AFAIK. I could open one up if there
is real interest.
> > Anybody working on a Moto coldfire, m68kish, NetBSD port? Can't let
> > them oily penguins get all the Cisco 2501 glory! B^).
I started working on it before I fully realized they had a 68EC030 without
a proper MMU. If I remember some details from the datasheet correctly the
'EC' part ignores the MMU instructions, but provides some limited ability
to map "segments" so that a program at 0xN00... thinks it is at 0x00000...
I don't know if this shadowing would be enough to allow a "normal" m68k
binary to run, just without any memory protection.
I guess the idea would be for the kernel to run at the top of memory and
at context switch the process to be run would be shadow mapped to 0x0.
It could still clobber anything else in memory though. :-)
I may be totally wrong about this, so take this with a shovel of salt. :)