DoC Debug Level Issue

[John Day]

> I have a 64 Mb DoC that boots Linux using GRUB.  However, depending on
> what I set the MTD debug level to, the system will either work well, or
> hang when accessing the DoC.  I am using kernel 2.4.18 with the MTD CVS
> as of about one week ago.  The device has one ext2 partition on it.

> With the debug verbosity set to 3 (highest), the system boots fine, but
> rapidly fills up the kernel log file, especially when the DoC is the
> only device in the system.  With the debug level set to 2 or lower, the
> system hangs at the point during boot where the kernel tries to launch
> the init process.

> Any suggestions are appreciated.

> -- Dave

I have been investigating a similar problem with our MPC8260 PCB with a 3.3v
48M DOC using 2.4.10 Kernel.

Found the DOC resets during DoC_ScanChips in DOC2000.c when an invalid
second floor is selected. The code locks up unless the floating data bus
reads high. Later code seems to re-initialise the DOC....

Try setting MAX_FLOORS in DOC2000.h to 1. Temporary fix but worked for me.

This function does not appear to have changed in later kernels.

Hardware not Linux expert so sorry if email format not correct

John Day

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