MVME2100 patch

MVME2100 patch

[okorpil]

Hello.

Before I'm going into a prolonged Easter weekend, I've updated my patch
for the MVME2100.

Straightened out the interrupt configuration of the EPIC according to tips
from Tom Rini, commented a bit of stuff, cleaned up the patch itself, and
tested it. Boots up, works fine.

Tests for sanity of PCI/PMC cards and the VME-Bus stuff are planned for
the next weeks.

Get the patches at:
http://www.fh-landshut.de/~okorpil/mvme2100-linux-2.4.25.patch.bz2
http://www.fh-landshut.de/~okorpil/mvme2100-linux-2.4.25.patch.gz


My interrupt config without addon cards looks like this:

# cat /proc/interrupts
           CPU0
  2:          0   i8259     Edge      82c59 secondary cascade
  8:          0   i8259     Edge      rtc
 16:       1828   OpenPIC   Level     eth0
 25:        311   OpenPIC   Level     serial
BAD:          1

I still wonder why it maps RTC to IRQ8, because it should be at 27 in my
current config - 2nd line after serial.

Was wrong about IRQ stuff last time - I'm off course operation in serial
IRQ mode here, because there is a serial IRQ source (8259(attached to the
IRQO of the OpenPIC, giving me the 12 (16 in total, 4 unused) IRQs I care
about. But no cascade within that 16 lines, so no cascade hook.

I hope I got it right now.

Have a happy Easter, y'all.
Oliver Korpilla

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Re: MVME2100 patch

[Adrian Cox]

On Wed, 2004-04-07 at 15:51, okorpil@fh-landshut.de wrote:

> Was wrong about IRQ stuff last time - I'm off course operation in serial
> IRQ mode here, because there is a serial IRQ source (8259(attached to the
> IRQO of the OpenPIC, giving me the 12 (16 in total, 4 unused) IRQs I care
> about. But no cascade within that 16 lines, so no cascade hook.

I'm not sure what you mean here. The presence of an i8259 cascade is
independent of the EPIC serial mode. EPIC serial mode is a hardware
design decision, which is required if you need to feed more than 5
sources into the EPIC. An i8259 is just another source, and as far as I
can tell, there is no i8259 on the MVME2100.

The RTC is probably connected to IRQ 8 because you set CONFIG_RTC=y. Use
CONFIG_GEN_RTC instead.

- Adrian Cox


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