[U-Boot-Users] simplify bootm command

[Detlev Zundel]

Hi,

> Wolfgang Denk wrote:
>>> One minor flaw, I don't see how "bootm" the env script could run "bootm" 
>>> the built-in command, because it would instead recursively run "bootm" 
>>> the env script if scripts have higher priority and the command line 
>>> "bootm" would run the built-in "bootm" if scripts have lower priority. 
>> 
>> That's why I think we should have an explicit "builtin" command, i. e.
>> command with the name "builtin" that will always run the corresponding
>> builtin command, no if there is a "command alias" or not - similar to
>> the bash command:
>
> Ahh, I missed the point that "builtin" was a command, not a concept. 
> Yes, that solves the dilemma neatly.
>
> WRT Albert's comment:
>> ... and make sure that one can *never* define an environment variable 
>> called 'builtin', and even remove any such definition if found in the 
>> environment when reading it from persistent memory at boot.
>
> ...another way of handling this would be to special-case the "builtin" 
> command so that it takes precedence over a "builtin" env variable (i.e. 
> ignore an env variable named "builtin").  I'm not wild about 
> auto-deleting env variables.

But ignoring it by having a separate precedence is again a special case
which we want to avoid ;) 

So I agree 100% with the whole idea and agree with Albert to "fail
loudly" in this case (another pretty clever Unix design philosophy).

Cheers
  Detlev

-- 
Directories are added, deleted, and rearranged much as you would
expect, even if you don't know it's what you'd expect.
                                         -- Tom Lord in TLA Documentation
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de