netdev - Re: ARCNET Contemporary Controls PCI20EX PCIe Card

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Date:   Sat, 18 May 2019 21:31:20 +0000
From:   "Kenton, Stephen M." <skenton@...edu>
To:     Michael Grzeschik <mgr@...gutronix.de>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: ARCNET Contemporary Controls PCI20EX PCIe Card

On 5/17/19 2:38 PM, Michael Grzeschik wrote:

> On Fri, May 17, 2019 at 07:03:19PM +0000, Kenton, Stephen M. wrote:
>> I've got some old optical (as in eyeglasses) equipment that only talks
>> over ARCNET that I want to get up and running. The PEX PCIe-to-PCI
>> bridge is on the card with the SMC COM20022 and lspci sees them
>>
>> 02:00.0 PCI bridge [0604]: PLX Technology, Inc. PEX 8111 PCI
>> Express-to-PCI Bridge [10b5:8111] (rev 21)
>> 03:04.0 Network controller [0280]: Contemporary Controls Device
>> [1571:a0e4] (rev aa)
>>        Subsystem: Contemporary Controls Device [1571:a0e4]
>>
>> I just pulled the current kernel source and 1571:a0e4 does not seem to be supported by the driver.
>>
>> Before I start trying to invent wheels, is/has anyone else looking in this area?
> Hi,
>
> you should probably add a new entry into com20020pci_id_table
> with the mentioned id 1571:a0e4 in drivers/net/arcnet/com20020-pci.c
> and try how far you will come.
>
> Regards,
> Michael
>
I thought I would try temporarily adding support for the card id via 
sysfs before trying to build from source

cd /sys/bus/pci/drivers

sudo modprobe com20020_pci
This creates the com20020 directory but not a com20020_pci directory if that matters

echo 1571 A0E4 | sudo tee com20020/new_id
This immediately generated two "killed" message in addition to echoing the PCI address to the console
which is probably not a good sign although it now claims to have a kernel driver, see below

lspci -nnk
<snip>
20:00.0 PCI bridge [0604]: PLX Technology, Inc. PEX 8111 PCI Express-to-PCI Bridge [10b5:8111] (rev 21)
21:04.0 Network controller [0280]: Contemporary Controls Device [1571:a0e4] (rev aa)
     Subsystem: Contemporary Controls Device [1571:a0e4]
     Kernel driver in use: com20020

Not surprisingly "ifconfig -a" does *NOT* show an arc0 interface

There are references to the COM20022 chip in the com20020 driver source so I was hoping it was really com2002x :-(

How now? My desktop is Ubuntu 14.04LTS (4.4.0-148) up-to-date will be much easier to use for testing but the intended target is running Ubuntu 18.04LTS up-to-date

Thanks,

Steve Kenton