Passing boot logs to Linux?

[Dragan Simic]

On 2023-12-20 11:31, Mark Kettenis wrote:
>> Date: Tue, 19 Dec 2023 23:45:48 -0500
>> From: Sean Anderson <seanga2 at gmail.com>
>> 
>> On 12/19/23 23:11, Simon Glass wrote:
>> > On Tue, 19 Dec 2023 at 13:15, Csókás Bence <Csokas.Bence at prolan.hu> wrote:
>> >> Is passing the U-Boot boot log to Linux supported yet? We are working
>> >> with a third-party solution, which works, but is a bit hacky, so I was
>> >> wondering if an official solution has been merged yet.
>> >>
>> >> I saw that there was an option CONFIG_CONSOLE_RECORD that saves
>> >> everything to a membuff, but I don't know if that can be exported to
>> >> Linux yet. And if not in the tree yet, would such a patch be welcome?
>> >
>> > Not yet, but yes I would like to see this.
>> 
>> I think most of the infrastructure is already here. We could use
>> either console recording (as mentioned above), which is more
>> complete, or a new LOG_DRIVER (which would have the advantage of
>> omitting things like countdowns).
>> 
>> In terms of sending things to Linux, I think the natural choice
>> would be pstore, which we already have a parser for.
> 
> Well, this should be OS-agnostic of course ;)

If possible, of course.

> What is pstore?  Is this documented somewhere?

As I already explained briefly in one of my earlier posts, it's a 
mechanism that the Linux kernel uses to store the kernel crash data on 
persistent storage, for later examination.

Please see the following links, for exaple, for more details:

- https://docs.kernel.org/admin-guide/pstore-blk.html
- https://man7.org/linux/man-pages/man8/systemd-pstore.8.html
- 
https://blogs.oracle.com/linux/post/pstore-linux-kernel-persistent-storage-file-system