Re: [PATCH v5 15/31] powernv/fadump: support copying multiple kernel boot memory regions

[Hari Bathini]

On 04/09/19 5:00 PM, Michael Ellerman wrote:
> Hari Bathini <hbath...@linux.ibm.com> writes:
>> Firmware uses 32-bit field for region size while copying/backing-up
> 
> Which firmware exactly is imposing that limit?

I think the MDST/MDRT tables in the f/w. Vasant, which component is that?

>> +    /*
>> +     * Firmware currently supports only 32-bit value for size,
> 
> "currently" implies it could change in future?
> 
> If it does we assume it will only increase, and we're happy that old
> kernels will continue to use the 32-bit limit?

I am not aware of any plans to make it 64-bit. Let me just say f/w supports
only 32-bit to get rid of that ambiguity..

- Hari