Passing boot logs to Linux?

[Dragan Simic]

On 2023-12-20 21:03, Sean Anderson wrote:
> On 12/20/23 14:24, Csókás Bence wrote:
>> On 2023. 12. 20. 9:29, Dragan Simic wrote:
>>> On 2023-12-20 08:52, Csókás Bence wrote:
>>>> On 2023. 12. 20. 8:09, Dragan Simic wrote:
>>>>> On 2023-12-20 07:49, Csókás Bence wrote:
>>>> That's what I read as well. Is there support for U-boot to write and
>>>> Linux to read PStores?
>>> 
>>> No and yes, but U-Boot can already read pstore.  Please see
>>> doc/usage/cmd/pstore.rst for the U-Boot part, and
>>> Documentation/admin-guide/pstore-blk.rst for the Linux kernel part.
>> 
>> Irrelevant, as we only want to write out the console log to U-Boot, 
>> and
>> not the other way around (that's for collecting panic logs, which is
>> already implemented).
>> 
>>> Another benefit of using pstore would be no permanently wasted RAM 
>>> for
>>> the recorded console contents.  Also, having the data recorded to a
>>> storage device also goes along with providing permanent records.
>> 
>> I'm positively *not gonna save boot logs to disk*, as most embedded
>> systems have Flash-based storage media; writing to them on every boot
>> would be devastating. Plus, I don't want the console subsystem to 
>> depend
>> on any file/disk operations/drivers.
> 
> pstore is agnostic to the backend used. In U-Boot we only support RAM
> backends at the moment.

That's a very good point.