Re: custom mpc8240 student project (long)

Thanks for your response.  I was hoping to use something I
 build myself to do the BDM programming.  Something similar
 to what people are doing for the LART project with JFlash.
  I understand a NDA is required for all the details about
 the JTAG/COP port on the MPC8240 but all I really need
 here is basic flash programming so I can bootstrap
 something that will load a real bootloader through the
 uart.  Is enough information about the BDM available to do
 this?  I'm not afraid of hacking something together if the
 information is there.

Thanks again.


      --Dustin


On Mon, 18 Feb 2002 21:17:26 +0100
 Langus Matevz    RDHW_EXT [off-list ref] wrote:

Hi!

I don't see any reasons to add buffers betwen UART and
 CPU. Max232 does all
driving usually.

Programming Flash thru BDM is a good idea, just be
 careful which BDM
debugger you will buy. I have a lot of problems with
 Windriver's
visionProbe-II and visionICE-II. They do not work with
 never versions of
MPC8260 - I need to renew (and pay) licence in order to
 get it working. And
Windriver is responding very slowly...
Choose another one.

quoted

but what is the cheapest way to get a 4-6 layer board

 done.

Try www.iskratel-electronics.si

Matevz

-----Original Message-----
From: Dustin Byford [mailto:dustin@firein.net]
Sent: Monday, February 18, 2002 11:34 AM
To: linuxppc-embedded@lists.linuxppc.org
Subject: custom mpc8240 student project (long)



Hi,

For purely academic purposes I am building an IP router
 based on an mpc8240
in my "capstone" EE class at NMSU.  I was wondering if
 someone who may have
done something similar could tell me if I'm working in
 the right direction.
I've done some research with the list archives and I
 think I have decided on
a basic hardware layout.  I'm just wondering if my ideas
 are sane and I have
a couple of questions.

I will be wire-wrapping the entire design (sockets have
 been acquired) and
and plan to use:

MPC8240 (At ~30MHz bus)
National 16550 UART connected to RCS1, etc...
2 16-bit flash ROMs (8MByte total) (Am29LV320D x2)
 connected toRCS0, etc...
128MB SDRAM in 1 DIMM PCI (wire wrap board attached to a
 backplane) with 2
FA310TX netgear cards There is also a reset circuit, a
 power supply, and I'm
guessing I need a buffer between the UART and the CPU and
 a MAX232 for
serial line driving.

I also planned to start out by programming the ROMs
 through the BDM/JTAG
port on the CPU.  I'll start with the GDB target for MPCs
 and attempt to
load a program into RAM to program the 2 flashes,
 with--ppcboot.  Hopefully
this will allow me to run the 2.4_devel version of the
 ppc kernel,
busybox/uclibc as a distro and iptables as the "router".

I'm expecting many frustrations (I mean learning
 experiences) along the way
and I suppose I'll begin with sandpoint code for ppcboot
 and the kernel.

So, what do you think.  Will it work?  Also, is there
 maybe a different
kernel I should start out with.  Anybody see any major
 pitfalls?

Also, in the chance that this works I would love to PCB
 it and fire it up at
200 MHz/100MHz Memory/66MHz PCI and then hang it on my
 wall because I have
to give the 8240 back to my professor.  I can design the
 PCB but what is the
cheapest way to get a 4-6 layer board done.

Thanks for any and all advice!

			--Dustin

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