I'd like to use one of the currently unused SCC's as WAN interface.
My ultimate dream is to run PPP or Frame Relay at a speed of
2Mb/s on it.
......
Hi Ruedi,
I too am hoping to one day run one SCC on an MBX860 board as a 2M WAN
port. My general plan was to run the SCC in HDLC synchronous mode and use
the PPP protocol on top of this. From my quick investigation I found that
in the LinuxPPc /kernel/drivers/char area there some files synclink.c
(rewrite of serial.c) and n_hdlc.c (rewrite of ppp.c). Together they form a
Linux Device Driver & line disipline for a synchrouous PPP link.
Unfortunately the synclink.c driver is dedicated to a PCI serial card
produced by MicroGate.
What is needed is a new version of 8xx_io/uart.c that sets up and drives
the SCC as a synchronous serial port. This may then be useable with the sync
PPP line disipline from the above driver.
I have started playing with it but only when I have some spare time....
and I dont seem to get much of that these days :-(
Please let me know if you get any info from other people or find out any
other possible solutions....
Regards
Hugh McDonald
hugh.mcdonald@nokia.com
-----Original Message-----
From: EXT Ruedi.Hofer@ascom.ch [mailto:Ruedi.Hofer@ascom.ch]
Sent: Tuesday, May 30, 2000 1:51 AM
To: linuxppc-embedded@lists.linuxppc.org
Cc: kernel@linux01.hasler.ascom.ch
Subject: SCC used for WAN connection
Hi,
I'd like to use one of the currently unused SCC's as WAN interface.
My ultimate dream is to run PPP or Frame Relay at a speed of
2Mb/s on it.
Is someone out there, who has
1. seen something like this?
2. written some kernel modules which support this functionality?
3. seen links containing related information?
4. ideas on how to do this?
If you were doin' something like that, would you first buy a
WAN Interface
card for the PC? (eg. Sangoma, for tests?)
5. Has someone done tests with such a WAN card?
Thanx for any information,
Ruedi
From: john zhan <hidden> Date: 2000-06-14 03:24:40
hi, Hugh McDonald
On 30/5/00 Ruedi Hofer wrote,
quoted
I'd like to use one of the currently unused SCC's as WAN interface.
My ultimate dream is to run PPP or Frame Relay at a speed of
2Mb/s on it.
me too. in fact, also, I need generic x.25 running on it.
Hugh McDonald wrote,
Hi Ruedi,
I too am hoping to one day run one SCC on an MBX860 board as a 2M WAN
port. My general plan was to run the SCC in HDLC synchronous mode and use
the PPP protocol on top of this. From my quick investigation I found that
in the LinuxPPc /kernel/drivers/char area there some files synclink.c
(rewrite of serial.c) and n_hdlc.c (rewrite of ppp.c). Together they form a
Linux Device Driver & line disipline for a synchrouous PPP link.
Unfortunately the synclink.c driver is dedicated to a PCI serial card
produced by MicroGate.
yes , we NEED a SCC HDLC mode synchronous driver.
What is needed is a new version of 8xx_io/uart.c that sets up and drives
the SCC as a synchronous serial port. This may then be useable with the sync
PPP line disipline from the above driver.
I have started playing with it but only when I have some spare time....
great!
I think it will probably have big difference from the existing uart.c , and init routine must contain of both uart and hdlc init code.
or , maybe need reconstruct the directory/file structures , add hdlc.c which supports full features of net device.
and I dont seem to get much of that these days :-(
Please let me know if you get any info from other people or find out any
other possible solutions....
I think we can work together .
If you like,let's discuss it later , privately.
what do you say?
regards.
john zhan.
hacking time.
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
From: john zhan <hidden> Date: 2000-06-17 00:16:54
hi, Hugh McDonald
On 30/5/00 Ruedi Hofer wrote,
quoted
I'd like to use one of the currently unused SCC's as WAN interface.
My ultimate dream is to run PPP or Frame Relay at a speed of
2Mb/s on it.
me too. in fact, also, I need generic x.25 running on it.
Hugh McDonald wrote,
Hi Ruedi,
I too am hoping to one day run one SCC on an MBX860 board as a 2M WAN
port. My general plan was to run the SCC in HDLC synchronous mode and use
the PPP protocol on top of this. From my quick investigation I found that
in the LinuxPPc /kernel/drivers/char area there some files synclink.c
(rewrite of serial.c) and n_hdlc.c (rewrite of ppp.c). Together they form a
Linux Device Driver & line disipline for a synchrouous PPP link.
Unfortunately the synclink.c driver is dedicated to a PCI serial card
produced by MicroGate.
yes , we NEED a SCC HDLC mode synchronous driver.
What is needed is a new version of 8xx_io/uart.c that sets up and drives
the SCC as a synchronous serial port. This may then be useable with the sync
PPP line disipline from the above driver.
I have started playing with it but only when I have some spare time....
great!
I think it will probably have big difference from the existing uart.c , and init routine must contain of both uart and hdlc init code.
or , maybe need reconstruct the directory/file structures , add hdlc.c which supports full features of net device.
and I dont seem to get much of that these days :-(
Please let me know if you get any info from other people or find out any
other possible solutions....
I think we can work together .
If you like,let's discuss it later , privately.
what do you say?
regards.
john zhan.
hacking time.
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
From: Dan Malek <hidden> Date: 2000-06-17 17:14:49
john zhan wrote:
me too. in fact, also, I need generic x.25 running on it.
So, write it.
quoted
What is needed is a new version of 8xx_io/uart.c that sets up and drives
No, what you want is an SCC synchronous driver. Period. Don't put
stuff like this in the uart driver, it is a big enough mess the
way it is. I am close to having a really configurable uart driver,
so you can select what SCC/SMCs you want. The uart driver is a uart
driver, not an SCC driver.
We will probably have to create some other functions for managing the
baud rate generators, but for synchronous I/O that clock should be
provided externally.
quoted
other possible solutions....
I think we can work together .
If you like,let's discuss it later , privately.
I would strongly suggest not going off and making a big mess, then
sending me a patch and hope it gets applied to the kernel sources.
I have done lots of synchronous SCC, HDLC, and other things as custom
proprietary drivers for many customers. Typically, the driver does
very little, just buffers the data for mmap()'ed applications that
do the real work. I will see if I can provide some framework from
past work I have done, but some of these folks are quite protective
of this.
These drivers are not hard to write, and you can use examples from
Motorola's NetComm site to get started. You may need to do some
uncached memory buffering tricks in Linux or just use cache management
functions to ensure cache coherency.
Don't use old silicon, like before Rev. C 860. Most of these functions
don't work as advertised on SCC3 and SCC4, only on SCC1 and SCC2. Make
sure you pay close attention to the external hardware, as clock and
data transition edges are criticaly to this working correctly.
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/