Interfaces supported on PPC860?

[Wohlgemuth, Jason]

David,

Off the top of my head, I am pretty sure that you will not be able to
support RTS/CTS flow control over the  SMC/SCC's, I believe that at one time
we thought that the SCC's could do it but it isn't truely done in hardware.
You will have to refer the the Motorola PowerQUICC Manual, or look through
the list's archives.  The ethernet driver included in the mpc8xx-2.2.13.tgz
works great, you will need to tweak the kernel in several places to fit your
board configuration, especially the GPIO for your ethernet signals, but it
is straightforward.  Also, you will have to modify fadsrom.tgz pretty
significantly to support the DRAM timings for your board, chip selects, and
so on... mpc8xx-2.2.13 will not work right out of the box on your custom
board, you have a lot of work to do with the bootrom (fadsrom is a great
starting point) and kernel changes.  Drop me a line if you run into problems
and I'll see if I can assist you.

Jason

-----Original Message-----
From: owner-linuxppc-embedded at lists.linuxppc.org
[mailto:owner-linuxppc-embedded at lists.linuxppc.org]On Behalf Of Brown,
David (dbrown03)
Sent: Thursday, April 06, 2000 12:04 PM
To: 'linuxppc-embedded at lists.linuxppc.org'
Subject: Interfaces supported on PPC860?



I am planning on running Linux on an existing custom 860-based board, and on
a second board which is still being designed.  The application will include
TCP/IP over Ethernet and PPP interfaces.

Can someone please give me feedback on how difficult this will be?
Specifically, are all of the interfaces I require currently supported in the
kernel?
Or will I have to tweak the kernel code?
Or will I have to write some new drivers?
What could I change on the new board to work better with Linux?
Do the serial drivers support RTS/CTS flow control?

If I should be reading some existing document or web-page instead of asking
the list, please kindly redirect me.  I have looked at the mpx8xx-2.2.13.tgz
code from ppc.kernel.org (I think that's where I got it from), and I have
successfully built and loaded it on a BSE ipEngine.  I haven't looked at the
2.3.x series code yet.


Interfaces of the existing board:

Flash: 1MB(AMD) + 8MB(Intel)

SCC1:	Ethernet (external PHY), using RXD, TXD, RTS, CTS, CD, and RCLKI
	(ethernet chip supplies 20MHz clock on RCLKI)

SCC3:	Async serial: RXD, TXD

SCC4:	Ethernet loopback and enable (using RXD and TXD lines)

SMC1:	Async serial: RXD, TXD

SMC2:	Async serial: RXC, TXD

PortC: general purpose I/O, for a user-space driver of a simple LCD display
and keyboard.



Interfaces of the new board:

Flash: 1MB(AMD) + 8MB(Intel)

SCC1:	Ethernet (external PHY), using RXD, TXD, RTS, CTS, CD, and RCLKI

SCC2: Async serial: RXD, TXD (and flow control if possible)

SCC3:	Async serial: RXD, TXD (and flow control if possible)

SCC4:	Async serial: RXD, TXD (and flow control if possible)

SMC1:	Async serial: RXD, TXD

SMC2:	Async serial: RXC, TXD

PortA: Ethernet loopback and enable control signals

SPI:	Communication with another processor.
	Does the Linux kernel use this at all today?
	If not, I'd probably try to expose it to user space.

PCMCIA: no use for it now, but looking to the future

--
Dave Brown <dbrown03 at harris.com>


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