[U-Boot] [PATCH 0/6] board: ti: am43xx: Enable hardware leveling

[keerthy]

On 4/15/2019 6:35 AM, Tom Rini wrote:
> On Mon, Apr 15, 2019 at 06:19:31AM +0530, keerthy wrote:
>>
>>
>> On 4/13/2019 6:32 PM, Tom Rini wrote:
>>> On Fri, Apr 12, 2019 at 12:08:14PM +0530, Keerthy wrote:
>>>
>>>> The series adds the support for hardware leveling. This needs the
>>>> kernel to be patched with hardware leveling support and the
>>>> kernel support is already in linux-next:
>>>>
>>>> https://patchwork.kernel.org/project/linux-omap/list/?series=100273
>>>>
>>>> Match recommended values from EMIF Tools app note:
>>>> http://www.ti.com/lit/an/sprac70/sprac70.pdf
>>>
>>> What happens if you boot an old kernel with this series applied?  I'm a
>>> bit worried about applying something that breaks existing kernels,
>>> thanks!
>>
>> Hi Tom,
>>
>> Deep Sleep 0 feature will fail as the corresponding hardware leveling
>> patches will not be present.
> 
> So to be clear, some new functionality will not work, but there is no
> functional regression?

Okay i got your concern. Deep sleep 0 is currently working with software 
leveling that will stop working with this patch series(hardware 
leveling) applied on older kernels. EMIF tools application note 
recommends hardware leveling over what existed previously.

Hence i posted this series. Older kernels with this patch series Deep 
sleep 0 feature will regress.

>