| Author |
Message |
Patrick
Guest
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 Posted:
Tue Dec 14, 2004 12:46 am Post subject:
pausing execution on ppc405 |
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Hello,
i'm trying to stop a running executable on the ppc405 placed on a
virtex2-pro.
Currently i'm trying to do this by pulling the clock-input
(CPM405CLOCK) to the ppc to 1 (simple by using a multiplexed bufg
switching between normal clock( ppc_clk_), and net_vcc0), thus
imitating kind of power management as i read in the
ppc405-block-reference-guide.
This approach won't work, the ppc is not responding when normal clock
operation continues.
My next intention was to suspend the ppc in software, though there is
no halt-instruction.
In further threads i read setting the msr[13]-bit will put the ppc to
sleep and certain interrupts will awaken it again.
So, if anyone has done this before or has further suggestions how to
do this any help would be very useful.
Thanks.
Best regards,
Patrick Siegel |
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Peter Ryser
Guest
|
| Posted:
Tue Dec 14, 2004 1:26 am Post subject:
Re: pausing execution on ppc405 |
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Depending on what you are trying to do you can use the DBGC405DEBUGHALT
pin on the processor block to stop the processor. See the PowerPC 405
Processor Block Guide for more information
(http://direct.xilinx.com/bvdocs/userguides/ug018.pdf).
- Peter
Patrick wrote:
| Quote: | Hello,
i'm trying to stop a running executable on the ppc405 placed on a
virtex2-pro.
Currently i'm trying to do this by pulling the clock-input
(CPM405CLOCK) to the ppc to 1 (simple by using a multiplexed bufg
switching between normal clock( ppc_clk_), and net_vcc0), thus
imitating kind of power management as i read in the
ppc405-block-reference-guide.
This approach won't work, the ppc is not responding when normal clock
operation continues.
My next intention was to suspend the ppc in software, though there is
no halt-instruction.
In further threads i read setting the msr[13]-bit will put the ppc to
sleep and certain interrupts will awaken it again.
So, if anyone has done this before or has further suggestions how to
do this any help would be very useful.
Thanks.
Best regards,
Patrick Siegel |
|
|
| Back to top |
|
|
Guest
|
| Posted:
Tue Dec 14, 2004 8:45 pm Post subject:
Re: pausing execution on ppc405 |
|
|
| Quote: | Depending on what you are trying to do you can use the
DBGC405DEBUGHALT
pin on the processor block to stop the processor. See the PowerPC 405
Processor Block Guide for more information
(http://direct.xilinx.com/bvdocs/userguides/ug018.pdf).
- Peter
|
Hello,
thanks for the hint, i'll try. But i think i found out that solely
stopping execution won't solve my problem.
What i am trying to do is bypass the ppc to directly access sdram
(a component on the fpga is saving/fetching data in sdram, but an
executable is running in sdram, too. Resulting in concurrent accesses
on the same addresslines ).
My hope is, once the ppc is put to sleep, i can manage the bus and
access sdram without destroying the executable/cpu-context.
My first thought was to use DMA, but i cannot find any examples how to
implement a DMA-capable obp-ipif with a master attachement to the bus,
at least not with EDK6.2.
(as far as i understand a master attachement is needed for dma-access)
EDK6.2 only provides a very basic opb-ipif reference-design with a
master attachement..
Best regrads
Patrick |
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tony.p.lee@gmail.com
Guest
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| Posted:
Thu Dec 16, 2004 4:43 am Post subject:
Re: pausing execution on ppc405 |
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Patrick wrote:
| Quote: | Hello,
i'm trying to stop a running executable on the ppc405 placed on a
virtex2-pro.
|
^C in gdb over xmd over jtag?
-Tony |
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