> Can we use existing backend pstore ram driver (fs/pstore/ram.c) for DDR
> instead of SRAM ?
The expectation for pstore is that the system will go through a reset when it
crashes. Most systems do not preserve DDR contents across reset.
> Was the current driver written only to support persistant RAM like SRAM
> or it can accept further change
Linux is in a constant state of change :-)
> to support DDR, If we have a mechanism to copy stored data from DDR to
> external device after the crash.
See above about DDR contents. But if you have a platform that does preserve
DDR contents until your "mechanism" can copy the pstore buffer, then post
a patch.
-Tony
On 2/10/2021 2:32 AM, Luck, Tony wrote:
>> Can we use existing backend pstore ram driver (fs/pstore/ram.c) for DDR
>> instead of SRAM ?
> The expectation for pstore is that the system will go through a reset when it
> crashes. Most systems do not preserve DDR contents across reset.
>
> to support DDR, If we have a mechanism to copy stored data from DDR to
> external device after the crash.
>> Was the current driver written only to support persistant RAM like SRAM
>> or it can accept further change
> Linux is in a constant state of change :-)
>
> See above about DDR contents. But if you have a platform that does preserve
> DDR contents until your "mechanism" can copy the pstore buffer, then post
> a patch.
Thanks for the reply
I have posted the patch.
https://lore.kernel.org/patchwork/patch/1378949/
-Mukesh
>
> -Tony