[Linux-parport] Problem with ppdev in EPP mode

Andreas Stricker andreas.stricker at fela.ch
Fri Apr 28 12:00:41 EDT 2006


I'm narrowing the problem. It seems like the mode IEEE1284_MODE_EPP
don't work on that machine. To remind:

 > parport_pc: VIA 686A/8231 detected

If I set the software emulated mode (IEEE1284_MODE_EPPSWE) it works.

The device is definitly able to do hardware supported EPP. If
I write directly to IO. I can send addresses by writing to
base_port+3 (address) and data by writing to base_port+4 (eppdata).
(base_port set to 0x378).

I've looked at the lspci output and saw this:

0000:00:0c.1 Parallel controller: Oxford Semiconductor Ltd: Unknown device 9500
0000:00:0c.1 0701: 1415:9500

Although it's a VIA board, could it be there was not the right
driver loaded?

Host bridge: VIA Technologies VT8605 [ProSavage PM133] (1106:0605)
ISA bridge: VIA Technologies VT82C686 [Apollo Super South] (1106:0686 rev 40)
Bridge: VIA Technologies VT82C686 [Apollo Super ACPI] (1106:3057 rev 40)

I'll do further research. I think it could be possible that this
parallel port device is unknow to the driver.


Andy who is still reading the kernel source...

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