[Skiboot] [PATCH] npu2: Disable fast reboot

[Balbir Singh]

On Wed, Mar 14, 2018 at 7:48 AM, Reza Arbab <arbab at linux.vnet.ibm.com> wrote:
> On Tue, Mar 13, 2018 at 01:51:52PM +1100, Alistair Popple wrote:
>>
>> Why/how do things break? This would effectively disable fast reboot on
>> Witherspoon (and possibly other systems which merely have it present), but
>> if it
>> only causes problems after the driver has loaded we could wait until then
>> before
>> disabling fast reboot.
>
>
> After a fast reboot, the links won't complete training. It seems independent
> of driver load, because I just verified this sequence:
>
> 1. Cold boot
> 2. Do not load driver
> 3. Fast reboot
> 4. Load driver
> 5. Sanity tests fail
>
> During (4), the training doesn't explicitly fail, but I noticed that not all
> the hw procedures are executed--the last one run is phy_disable_tx_rxcal
> (not check_credits), and the GPU memory is not onlined.
>

Reza

Have you tried putting the links in reset mode during the fast reboot
and see if that works?

Balbir Singh.