21 Nov
2014
21 Nov
'14
10:55 a.m.
On Thu, 20 Nov 2014, Clem Cole wrote:
I don't think the BSD networking code in 2.10
worked on systems with only
256K bytes of memory. The kernel is too big even without networking and a
lot of work was done to push things out of the kernel. [The 17th bit (split
I/D) really only mattered for user space, the kernel mapped things around -
but with only 18 bits of address map there is not much space]. Adding
networking and in particular the space for the mbuf's becomes a real issue.
It's unsupported; see my email where I pasted the "HCL" from 2.10's
GENERIC config.
Here are some thoughts..
1.) Easiest/Cheapest solution might be to front end the system with an RPi,
Intel Edison or the like and run the IP stack on it and then use one or
more serial ports from the micro to 11.
Well, 2.10 has SLIP, but it'd certainly be easier to implement a simple
userland tool to talk to a frontend!
2.) See if you can dig up an old copy of the 3
COM's first product - UNET -
which was the original TCP/IP for V7. It's old and not very sexy, but the
kernel requirements are minimal and if all you want it telnet & FTP that
will work.
That I am pretty sure I DO NOT have source for.
3.) If you have real hardware, see if you can find an
old Able "Enable"
board which will allow you to put 4Megs of memory in an 40 class processor
(you get a cache plus a new memory MAP with 22 bits of address like the 45
class processors). I had 2.X working on that years ago (and wrote a
USENIX paper on it). The Enable board support was in the BSD 2*
distributions (I put there) but I doubt its been tried in many years.
That sounds like a neat board. Betting it's a bit hard to find, though.
;)
4.) Ultrix-11 should boot on a 40 class system, but I
do not remember if on
the 18 bit machines you could configure networking. Armando might
remember if Fred ever made that work. If any one could have or would have,
it would have been Fred. As I said, there just is not a lot of space and
frankly there is not going to be a lot of space left for user programs.
I'd check but I'm pretty sure I don't have Ultrix-11 sources. :(
Clem
PS I remember running V6 on 11/34 with 48K bytes of memory for a few months
as our memory for that system was back ordered. It was slow, but it worked
and we were happy. It was our machine!!
What were you using for paging/swapping on that?
--
Cory Smelosky
http://gewt.net Personal stuff
http://gimme-sympathy.org Projects