MPC8xx DPRAM : m8xx_cpm_hostalloc

[Christian Batt]

Hello

I am currently working with a MPC860 (Linux kernel 2.2.13)
and I need more DPRAM space for my BD/buffers, than the
space between IMMR+0x2800 - IMMR+0x2F00 (1792 bytes).

I know the 860 has 5K of DPRAM : 4K + 1K of parameter RAM.

So, I have tried to modify the value of
    CPM_DATAONLY_BASE   from 0x0800 to 0x0000
    CPM_DATAONLY_SIZE     from 0x0700 to 0x1000
but my kernel (compiled with those values) stucks early at boot time :

...
Uncompressing Linux... done.
Now booting the kernel
    -(and no more)-

Does anybody have an idea why it seems I cannot use the space
between IMMR+0x2000-IMMR+0x2800 for my module ?

Thanks for any help

Regards

Christian


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