[U-Boot] [PATCH V3 0/8] SPL Linux boot

[Simon Schwarz]

Dear Wolfgang,

On 08/26/2011 01:36 PM, Wolfgang Denk wrote:
> Dear Simon,
>
> In message<4E563136.2030608 at gmail.com>  you wrote:
>>
>>> A question ex ante: what is the "bp" in "savebp" supposed to mean? I
> ...
>> It means "save boot parameters" - better proposals welcome.
>
> If it's not too much of trouble I would indeed ask you to change that
> name.
>
> Dismissing ecological considerations (should we save BP?), the
> ntroduction of such a command name would break a number of boards
> which use "save" as abbreviation for "saveenv" in their default
> configurations:
>
> FPS850L     M5253DEMO   M5329EVB    M5475EVB    TQM850L     TQM860M
> FPS860L     M5271EVB    M5373EVB    M5485EVB    TQM850M     TQM862L
> M5208EVBE   M5272C3     M54451EVB   NSCU        TQM855L     TQM862M
> M52277EVB   M5275EVB    M54451EVB   TQM823L     TQM855M     TQM866M
> M52277EVB   M5282EVB    M54455EVB   TQM823M     TQM860L     virtlab2
> M5235EVB    M53017EVB   M54455EVB
>
> Yes, it has always been a bad idea to use abbreviated command names
> in environment settings, but it's being done again and again (myself
> not being immune to that temptation).
>
> So please let's use a different name, one that does not start with
> "save".

Ecological reasons accepted :)

>
> Also, I think we should try and make the approach a bit more generic.
> Your current implementation supports only NAND as storage.  But what
> if we want to do the same when booting from SDCard?

Agreed.

>
> Maybe we should split the steps of extracting the FDT and ATAGS images
> and the process of actually writing them to persistent storage in two
> separate steps - for the second step we can then use existing standard
> commands, so only the "export" step is needed.

Essentially it would already be possible to extract FDT/ATAGS if
arm bootm implementation would implement prep subcommand.

I plan to split 1/8 from this set - see discussion for this patch. After 
that extract the images is just reading the start address and 
reading/calculating the size of them.

> As all this is about preparing for a SPL boot, I suggest we name the
> new command "spl"; the resulting user interface could be like this:
>
>
> 	spl export<img>  addr [args ...]
>
> with "img" being either "fdt" or "atags". [This would allow to add
> other SPL related commands easily in case we should need them.

No objections.

> What do you think?
>
> Best regards,
>
> Wolfgang Denk
>

Regards
Simon