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linux-2.6.14-m68k on performa 575   Message List  
Reply | Forward Message #7302 of 7317 |
Re: [linux-mac68k] linux-2.6.14-m68k on performa 575

On Mon, Nov 21, 2005 at 04:48:17PM +1100, Finn Thain wrote:
> With VIA 1 on interrupt level 6, ADB generally gets lower latency, which
> kind of explains the improvement in ADB but not the additional
> deterioration of SCSI caused by the alt_via_mapping change.
>
> I don't know what to conclude from this other than ADB probably has more
> than one race condition :-/

Well, many of the mac device drivers take a very stupid approach
to locking and reentrancy. Most of them try things like disabling
all interrupts to prevent problems, which just causes problems
for other drivers. They probably should all be rewritten from
scratch, but that's a painful suggestion.

The via-cuda driver is kind of odd in that it was originally
written for powermacs, and then hacked up to support 68k.

Brad Boyer
flar@...

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Mon Nov 21, 2005 6:49 am

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Forward 		Message #7302 of 7317 |
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Thanks for the OSX compile help! I'm now running 2.6.14-m68k on a Performa 575 w/ 68040 (not LC). The ADB seems to work fine now with light testing, the... 		bob
bob_b@...
Send Email 		Nov 10, 2005
2:15 pm

... Great! ... Please try this patch, http://www.telegraphics.com.au/~fthain/patches/sent/patch_b-mac68k_cvs_via_cleanup_and_fix2.diff It was needed to get...
Finn Thain
fthain@...
Send Email 		Nov 11, 2005
12:41 am

Oh DARN! I see something similar to that on my old source directory: patch_a-sonic-overhaul-and-update-new.diff patch_b-mac68k_cvs_via_cleanup.diff ...
Bob
bob_b@...
Send Email 		Nov 11, 2005
2:13 am

... Hmm.. I guess this can't be a hardware problem if 2.6.10 doesn't print these diagnostics... ... You need a patch like this. I haven't actually tested...
Finn Thain
fthain@...
Send Email 		Nov 11, 2005
4:10 am

... It is certainly worth a try. The original patch_b and patch_c can be used together, but neither one can be used with...
Finn Thain
fthain@...
Send Email 		Nov 11, 2005
12:09 pm

I haven't tried the patch_c yet. I did look at the source for the mac esp in the 2.6.10 with the 2.6.8 patches a,b, and c and compared it to the source for the...
Bob
bob_b@...
Send Email 		Nov 11, 2005
8:10 pm

... You could try sg_verify from the sg3-utils package ... I'd probably run that in single user mode, but only because I don't know what happens when a disk...
Finn Thain
fthain@...
Send Email 		Nov 12, 2005
12:00 am

... Tried with the patched 2.6.10 and it went through the whole disk without a problem. ... I tried it with your newest b and c patches above in 2.6.14 and it...
bob_b@...
Send Email 		Nov 12, 2005
4:22 pm

... Hmm. I hate regressions. ... Thanks for trying. I would try to reproduce this myself, but my macs are stored about 500 km from my present location. I do...
Finn Thain
fthain@...
Send Email 		Nov 13, 2005
1:09 am

... Same result unfortunately. I tried it with and without the via_alt_mapping code. I'm wondering if perhaps it isn't the interrupts in the case of the esp...
bob_b@...
Send Email 		Nov 13, 2005
7:16 am

... I wonder if the esp driver is sensitive to dma_supported() or some other change? Maybe it would be worth trying it without the 42_dma patch (and without...
Finn Thain
fthain@...
Send Email 		Nov 13, 2005
2:10 pm

... Tried the patchc #3, no change... I finally got rid of the error by disabling ADB in the 2.6.14 kernel. It appears there is some conflict between that and...
bob_b@...
Send Email 		Nov 14, 2005
2:45 am

... To answer that question I would have to eliminate the dma variable emprically. ADB shares VIA1 with the timer interrupt, and so I think that dma isn't the...
Finn Thain
fthain@...
Send Email 		Nov 14, 2005
4:19 am

... The CUDA ADB driver is very cavalier about poking bits in the VIA. It's possible that it's conflicting with one of the VIA driver changes in one of those...
Brad Boyer
flar@...
Send Email 		Nov 14, 2005
6:03 am

... patch_b is confined to VIA2... Adding patch_c didn't make any difference. I didn't think ADB was related to VIA2? -f ... ...
Finn Thain
fthain@...
Send Email 		Nov 14, 2005
12:40 pm

... That's true. There shouldn't be anything touching VIA2 in the ADB code. I have to admit that I haven't looked at your patches very closely. In any case,...
Brad Boyer
flar@...
Send Email 		Nov 14, 2005
9:33 pm

Hi All, Maybe the esp problem is timing related. I got an interesting result when I moved the kernel from compiling on an OSX machine to directly on the...
Bob Brose
bob_b@...
Send Email 		Nov 20, 2005
8:06 pm

... That seems odd. Could you send me both kernels (in a private email) so I can take a look at them? It's possible one compiler or the other has a bug in the...
Brad Boyer
flar@...
Send Email 		Nov 20, 2005
8:53 pm

Brad Boyer: . . ... Done. Also, I compared a bunch of different kernel compiles and interrupt configurations and made notes below... ... It seems like the adb...
Bob Brose
bob_b@...
Send Email 		Nov 20, 2005
11:23 pm

... Yes, that's a full ADB hang. All but the oldest models do reboot and shutdown using commands to the ADB controller. The driver probably got into a bad...
Brad Boyer
flar@...
Send Email 		Nov 21, 2005
3:34 am

... With VIA 1 on interrupt level 6, ADB generally gets lower latency, which kind of explains the improvement in ADB but not the additional deterioration of...
Finn Thain
fthain@...
Send Email 		Nov 21, 2005
5:48 am

... Well, many of the mac device drivers take a very stupid approach to locking and reentrancy. Most of them try things like disabling all interrupts to...
Brad Boyer
flar@...
Send Email 		Nov 21, 2005
7:43 am

... A while ago I had the same "stuck" key problem (on very similar hardware). http://marc.theaimsgroup.com/?l=linux-mac68k&m=112006052810878&w=2 ... OK, this...
Finn Thain
fthain@...
Send Email 		Nov 21, 2005
3:53 am

... You should also have gcc 3.3 and 3.4 for OS X. When following the instructions on the mac 68k site, just use a different $PATH. That is, any one of, ...
Finn Thain
fthain@...
Send Email 		Nov 21, 2005
12:33 am

Hi Kars, Looks like it wasn't esp directly anyway. I disabled the adb driver in the 2.6.14 kernel and it works now.. Bob ... -- /~\ The ASCII | Robert E....
bob_b@...
Send Email 		Nov 14, 2005
2:42 am
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