* MP8xx: not initialized CPM RAM crash
@ 2002-05-03 5:51 bart
2002-05-03 6:40 ` Wolfgang Denk
0 siblings, 1 reply; 3+ messages in thread
From: bart @ 2002-05-03 5:51 UTC (permalink / raw)
To: Embedded Linux PPC List; +Cc: dmalek
Hi,
I found in ./drivers/i2c/i2c-rpx.c in rpx_iic_init the structure member
ii->iic_rpbase != 0. Very likely because ppcboot uses this area as initial
stack. This causes the kernel to get a machine check during i2c init. Should
the CPM RAM not be zero'd somewhere during kernel boot?
Regards,
Bart
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: MP8xx: not initialized CPM RAM crash
2002-05-03 5:51 MP8xx: not initialized CPM RAM crash bart
@ 2002-05-03 6:40 ` Wolfgang Denk
2002-05-03 7:25 ` bart
0 siblings, 1 reply; 3+ messages in thread
From: Wolfgang Denk @ 2002-05-03 6:40 UTC (permalink / raw)
To: bart; +Cc: Embedded Linux PPC List, dmalek
In message <3CD2255B.330FA4E4@ardistech.com> you wrote:
>
> I found in ./drivers/i2c/i2c-rpx.c in rpx_iic_init the structure member
> ii->iic_rpbase != 0. Very likely because ppcboot uses this area as initial
> stack. This causes the kernel to get a machine check during i2c init. Should
> the CPM RAM not be zero'd somewhere during kernel boot?
Which kernel version are you talking about?
I think we fixed this in our version of the 8xx I2C driver long ago.
I don't think that the whole CPM RAM should be zeroed; it's
sufficient to correctly initialize the necessary fields.
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de
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who really run organizations are usually found several levels down,
where it's still possible to get things done.
- Terry Pratchett, _Small Gods_
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: MP8xx: not initialized CPM RAM crash
2002-05-03 6:40 ` Wolfgang Denk
@ 2002-05-03 7:25 ` bart
0 siblings, 0 replies; 3+ messages in thread
From: bart @ 2002-05-03 7:25 UTC (permalink / raw)
To: Wolfgang Denk; +Cc: Embedded Linux PPC List, dmalek
Wolfgang Denk wrote:
>
> In message <3CD2255B.330FA4E4@ardistech.com> you wrote:
> >
> > I found in ./drivers/i2c/i2c-rpx.c in rpx_iic_init the structure member
> > ii->iic_rpbase != 0. Very likely because ppcboot uses this area as initial
> > stack. This causes the kernel to get a machine check during i2c init. Should
> > the CPM RAM not be zero'd somewhere during kernel boot?
>
> Which kernel version are you talking about?
>
2.4.2 MontaVista HH linux
> I think we fixed this in our version of the 8xx I2C driver long ago.
>
Thanks, I'll check out a newer kernel.
Bart
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
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2002-05-03 5:51 MP8xx: not initialized CPM RAM crash bart
2002-05-03 6:40 ` Wolfgang Denk
2002-05-03 7:25 ` bart
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