Re: MP8xx: not initialized CPM RAM crash

In message [off-list ref] 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

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Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
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Wolfgang Denk wrote:

In message [off-list ref] you wrote:

quoted

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

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