* Floating point error on a MPC8280 based board
@ 2004-10-15 20:59 annamaya
2004-10-15 21:05 ` Kumar Gala
2004-10-15 21:21 ` Dan Malek
0 siblings, 2 replies; 4+ messages in thread
From: annamaya @ 2004-10-15 20:59 UTC (permalink / raw)
To: linuxppc-embedded
When I try to reboot my system on a MPC8280 eval
board, I see the floating point error. Does anyone
know why is this happening?
bash-2.05b# reboot -f
Restarting system
floating point used in kernel (task=cf458000,
pc=ff000104)
Thank you.
-Navin.
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Floating point error on a MPC8280 based board
2004-10-15 20:59 Floating point error on a MPC8280 based board annamaya
@ 2004-10-15 21:05 ` Kumar Gala
2004-10-15 21:21 ` Dan Malek
1 sibling, 0 replies; 4+ messages in thread
From: Kumar Gala @ 2004-10-15 21:05 UTC (permalink / raw)
To: annamaya; +Cc: linuxppc-embedded
One guess with be some possible memory corruption.
- kumar
On Oct 15, 2004, at 3:59 PM, annamaya wrote:
>
>
> When I try to reboot my system on a MPC8280 eval
> board, I see the floating point error. Does anyone
> know why is this happening?
>
> bash-2.05b# reboot -f
> Restarting system
> floating point used in kernel (task=3Dcf458000,
> pc=3Dff000104)
>
> Thank you.
> -Navin.
>
> __________________________________________________
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Floating point error on a MPC8280 based board
2004-10-15 20:59 Floating point error on a MPC8280 based board annamaya
2004-10-15 21:05 ` Kumar Gala
@ 2004-10-15 21:21 ` Dan Malek
2004-10-16 1:03 ` annamaya
1 sibling, 1 reply; 4+ messages in thread
From: Dan Malek @ 2004-10-15 21:21 UTC (permalink / raw)
To: annamaya; +Cc: linuxppc-embedded
On Oct 15, 2004, at 4:59 PM, annamaya wrote:
> When I try to reboot my system on a MPC8280 eval
> board, I see the floating point error. Does anyone
> know why is this happening?
It's trying to jump to a restart location in the boot rom.
It fetches a bad instruction that attempts to execute
as a floating point instruction.
> bash-2.05b# reboot -f
> Restarting system
> floating point used in kernel (task=cf458000,
> pc=ff000104)
This program counter is a typical warm restart boot
rom location. Change the kernel reboot code to jump
to the proper place in your boot rom or force a restart
in some way.
-- Dan
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Floating point error on a MPC8280 based board
2004-10-15 21:21 ` Dan Malek
@ 2004-10-16 1:03 ` annamaya
0 siblings, 0 replies; 4+ messages in thread
From: annamaya @ 2004-10-16 1:03 UTC (permalink / raw)
To: Dan Malek; +Cc: linuxppc-embedded
Thanks for the reply Dan. I see it clearly now. I
think I need to visit my optometrist again. The pc is
set to 0xff000104 but the flash is mapped at
0xfff00000 and the default vector is going to be
0xfff00100. I need to look at the reset code just as
you suggested. I was stumped by the "floating point"
error since that was not something I expected on a bad
instruction fetch.
--- Dan Malek <dan@embeddededge•com> wrote:
>
> On Oct 15, 2004, at 4:59 PM, annamaya wrote:
>
> > When I try to reboot my system on a MPC8280 eval
> > board, I see the floating point error. Does anyone
> > know why is this happening?
>
> It's trying to jump to a restart location in the
> boot rom.
> It fetches a bad instruction that attempts to
> execute
> as a floating point instruction.
>
> > bash-2.05b# reboot -f
> > Restarting system
> > floating point used in kernel (task=cf458000,
> > pc=ff000104)
>
> This program counter is a typical warm restart boot
> rom location. Change the kernel reboot code to jump
> to the proper place in your boot rom or force a
> restart
> in some way.
>
>
> -- Dan
>
>
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^ permalink raw reply [flat|nested] 4+ messages in thread
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2004-10-15 20:59 Floating point error on a MPC8280 based board annamaya
2004-10-15 21:05 ` Kumar Gala
2004-10-15 21:21 ` Dan Malek
2004-10-16 1:03 ` annamaya
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