A4000D & A3000D with Deneb

[Marcb]

Hi,

I have posted about this before here and in the Poseidon USB user group and although I found my own fix, it still bugs me that I've not really ever understood why I have a problem...

The problem is that when using the Deneb with Dma, everything boots fine and looks fine until I click on any icon, at which time the miggy freezes up and I need to reboot. This happens on both my 4000 & 3000...
When using Pio all is fine and if I boot with "Setpatch nocache" all is fine in dma mode with both the 3000 & the 4000

Both Denebs are using the latest version of Poseidon etc. and both have buster 11...

I've contacted michael bohmmer and sent him my startup-sequence but the problem remains.

As it is, both Denebs do work and I'm happy with them but I still would like to know why when I use Setpatch Nocache I can use Dma and when I don't I can't?

[Marcb]

@Matt_H

I read the Deneb manual so I knew that buster 11 had issues with Dma
I tried eliminating everything in the startup-sequence, one by one adding things back in, that's how I worked out that it was the Setpatch command, then I tried Nocache and voila... It's the data cache that causes the problem...
I don't have anything in the wbstartup... The 3000 just boots off an usb flash so apart from the Deneb there is nothing else in there, the 4000 has a Buddah installed...

@Alexh, on the 3000 I just have the poseidon files in the flash rom, in the 4000 nothing at all...

(actually the 4000 now has no motherboard, it's on it's way to Anthony Hoffman for some TLC)

[Marcb]

That's what I originally believed, but I recall reading lots of other posts saying that A3000 SCSI was DMA capable (is it DMA over a non-Zorro bus? Maybe that's where the confusion comes from).
 
 
@ Marcb
 
Have you updated the Deneb's firmware?

 
All updates done,  so I guess I'm just unlucky, noone else seems to have experienced the same problem and I have it with two Denebs and two different miggys ... weird..:confused:

[Marcb]

Hmmm...

An '030... I guess that is the common denominator...

Thanks Alexh, I'll try an '040 and report back

[Marcb]

My A4000d motherboard started flaking on me so I sent it to Anthony for repair, Anthony repaired it and before installing back in the case I changed the cpu to an A3640...


I am happy to report that I no longer have the problem with the Deneb!

I know i've muddied the waters by having the motherboard repaired, but I'm willing to bet Alexh was right and it was all down to the cpu board...

The repairs on the motherboard were to the rtc, ram tracks and caps...