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* RE: BDI2000 and failed MMU translations
@ 2002-01-23 22:22 Gessner, Matt
  2002-01-23 22:51 ` Dan Malek
  0 siblings, 1 reply; 9+ messages in thread
From: Gessner, Matt @ 2002-01-23 22:22 UTC (permalink / raw)
  To: 'Dan Malek', Gessner, Matt; +Cc: 'Linux PPC'


It's straight 2_4.  I wasn't stopping at start_kernel though.
I don't have PTBASE set up.

Not sure what I need.
Following some advice from mattl on #mklinux, I'm going to
break at start kernel FIRST, then connect with BDI, then
see if I can look at my data.

THX and Regards,

Matt

> -----Original Message-----
> From: Dan Malek [mailto:dan@embeddededge.com]
> Sent: Wednesday, January 23, 2002 5:24 PM
> To: Gessner, Matt
> Cc: 'Linux PPC'
> Subject: Re: BDI2000 and failed MMU translations
>
>
> Gessner, Matt wrote:
>
>
> > I get a LOT of failed MMU translations reported.
> > Is this b/c I have something misconfigured?
> > I'm running 2.4.18 out of bk on an 860P.
>
> Is it 2_4 or 2_4_devel?  I'm travelling for about the next
> week, but will check it out when I return (if I can borrow
> a BDI2000 from someone :-).
>
> Has it worked on previous kernel versions?  If so, which ones?
>
> Thanks.
>
>
> 	-- Dan
>

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

^ permalink raw reply	[flat|nested] 9+ messages in thread
* RE: BDI2000 and failed MMU translations
@ 2002-01-23 22:58 Gessner, Matt
  2002-01-23 23:34 ` Dan Malek
  0 siblings, 1 reply; 9+ messages in thread
From: Gessner, Matt @ 2002-01-23 22:58 UTC (permalink / raw)
  To: 'Dan Malek'; +Cc: 'Linux PPC'


Whooops, too soon.

OK, AFTER the first breakpoint, it then gets mad about
single stepping.

The MMU xlation fails for the next address.

Matt

> -----Original Message-----
> From: Dan Malek [mailto:dan@embeddededge.com]
> Sent: Wednesday, January 23, 2002 5:51 PM
> To: Gessner, Matt
> Cc: 'Linux PPC'
> Subject: Re: BDI2000 and failed MMU translations
>
>
> Gessner, Matt wrote:
>
> > It's straight 2_4.  I wasn't stopping at start_kernel though.
>
> You don't need to stop anywhere unless there are some breakpoints
> you want to set for early debug.
>
> > I don't have PTBASE set up.
>
> You need:
> 	MMU XLAT 0xc0000000
> 	PTBASE 0x000000f0
>
> The newer kernels initialize the page table pointers for the BDI2000,
> so ignore comments about stopping and setting values.  We went through
> several iterations of implementation, so anything written about how to
> do this manually is probably wrong :-).
>
> > ...... I'm going to
> > break at start kernel FIRST, then connect with BDI, then
> > see if I can look at my data.
>
> How do you break and then connect the BDI?  You need the BDI
> connected to set and trap the breakpoint.
>
> Have fun.
>
>
> 	-- Dan
>
>
>

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

^ permalink raw reply	[flat|nested] 9+ messages in thread
* RE: BDI2000 and failed MMU translations
@ 2002-01-23 22:57 Gessner, Matt
  0 siblings, 0 replies; 9+ messages in thread
From: Gessner, Matt @ 2002-01-23 22:57 UTC (permalink / raw)
  To: 'Dan Malek', Gessner, Matt; +Cc: 'Linux PPC'


Ah... breaking at "start_here" works much better...


> -----Original Message-----
> From: Dan Malek [mailto:dan@embeddededge.com]
> Sent: Wednesday, January 23, 2002 5:51 PM
> To: Gessner, Matt
> Cc: 'Linux PPC'
> Subject: Re: BDI2000 and failed MMU translations
>
>
> Gessner, Matt wrote:
>
> > It's straight 2_4.  I wasn't stopping at start_kernel though.
>
> You don't need to stop anywhere unless there are some breakpoints
> you want to set for early debug.
>
> > I don't have PTBASE set up.
>
> You need:
> 	MMU XLAT 0xc0000000
> 	PTBASE 0x000000f0
>
> The newer kernels initialize the page table pointers for the BDI2000,
> so ignore comments about stopping and setting values.  We went through
> several iterations of implementation, so anything written about how to
> do this manually is probably wrong :-).
>
> > ...... I'm going to
> > break at start kernel FIRST, then connect with BDI, then
> > see if I can look at my data.
>
> How do you break and then connect the BDI?  You need the BDI
> connected to set and trap the breakpoint.
>
> Have fun.
>
>
> 	-- Dan
>
>
>

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

^ permalink raw reply	[flat|nested] 9+ messages in thread
* RE: BDI2000 and failed MMU translations
@ 2002-01-23 22:55 Gessner, Matt
  0 siblings, 0 replies; 9+ messages in thread
From: Gessner, Matt @ 2002-01-23 22:55 UTC (permalink / raw)
  To: 'Dan Malek'; +Cc: 'Linux PPC'


Ok,

This still doesn't solve my problem.

In the Makefile:
	CONFIG_KERNEL = -g -ggdb

In mpc860.cnf for the bdi:
	MMU XLAT 0xc0000000 (this is the default BTW)
	PTBASE	0xf0
	BREAK SOFT

On the BDI:
	bi 0xc0157640 (start_kernel)
	go
	<breakpoint>

Now, start gdb w/ vmlinux
(gdb) target remote bdi:2001
(gdb) br scc_enet_init

On the BDI it says:
*** MMU: address translation for 0xC015ECB8 failed
(gdb) c
Continuing.
warning: Cannot insert breakpoint 1:
Error accessing memory address 0xc015ecb8: Operation not permitted

I'm using gdb 5.0.

Does this shed any more light?

TIA Dan and all,

Regards,

Matt

> -----Original Message-----
> From: Dan Malek [mailto:dan@embeddededge.com]
> Sent: Wednesday, January 23, 2002 5:51 PM
> To: Gessner, Matt
> Cc: 'Linux PPC'
> Subject: Re: BDI2000 and failed MMU translations
>
>
> Gessner, Matt wrote:
>
> > It's straight 2_4.  I wasn't stopping at start_kernel though.
>
> You don't need to stop anywhere unless there are some breakpoints
> you want to set for early debug.
>
> > I don't have PTBASE set up.
>
> You need:
> 	MMU XLAT 0xc0000000
> 	PTBASE 0x000000f0
>
> The newer kernels initialize the page table pointers for the BDI2000,
> so ignore comments about stopping and setting values.  We went through
> several iterations of implementation, so anything written about how to
> do this manually is probably wrong :-).
>
> > ...... I'm going to
> > break at start kernel FIRST, then connect with BDI, then
> > see if I can look at my data.
>
> How do you break and then connect the BDI?  You need the BDI
> connected to set and trap the breakpoint.
>
> Have fun.
>
>
> 	-- Dan
>
>
>

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

^ permalink raw reply	[flat|nested] 9+ messages in thread
* RE: BDI2000 and failed MMU translations
@ 2002-01-23 22:44 Rudolf Ladyzhenskii
  0 siblings, 0 replies; 9+ messages in thread
From: Rudolf Ladyzhenskii @ 2002-01-23 22:44 UTC (permalink / raw)
  To: 'Gessner, Matt', 'Linux PPC'


I had to patch 8260 version of kernel to get this to work properly. But I
was looking through 860 code and patch for BDI is there.

Check linux start-up file (it is head.S in /arch/ppc/kernel for 8260) and
search for 'abatron' and 'bdi'.

Did you have it to work before?

Rudolf

> -----Original Message-----
> From: Gessner, Matt [mailto:mattg@aiinet.com]
> Sent: Thursday, January 24, 2002 9:08 AM
> To: 'Linux PPC'
> Subject: BDI2000 and failed MMU translations
>
>
>
> Hi, all.
>
> Seeing this is topical right now...
>
> I get a LOT of failed MMU translations reported.
> Is this b/c I have something misconfigured?
> I'm running 2.4.18 out of bk on an 860P.
>
> TIA,
>
> Regards,
>
> Matt
>

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

^ permalink raw reply	[flat|nested] 9+ messages in thread
* BDI2000 and failed MMU translations
@ 2002-01-23 22:08 Gessner, Matt
  2002-01-23 22:23 ` Dan Malek
  0 siblings, 1 reply; 9+ messages in thread
From: Gessner, Matt @ 2002-01-23 22:08 UTC (permalink / raw)
  To: 'Linux PPC'


Hi, all.

Seeing this is topical right now...

I get a LOT of failed MMU translations reported.
Is this b/c I have something misconfigured?
I'm running 2.4.18 out of bk on an 860P.

TIA,

Regards,

Matt

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

^ permalink raw reply	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2002-01-23 23:34 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
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2002-01-23 22:22 BDI2000 and failed MMU translations Gessner, Matt
2002-01-23 22:51 ` Dan Malek
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2002-01-23 22:58 Gessner, Matt
2002-01-23 23:34 ` Dan Malek
2002-01-23 22:57 Gessner, Matt
2002-01-23 22:55 Gessner, Matt
2002-01-23 22:44 Rudolf Ladyzhenskii
2002-01-23 22:08 Gessner, Matt
2002-01-23 22:23 ` Dan Malek

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