[U-Boot] [PATCH 5/5] mx6cuboxi: Load the correct 'fdt_file' variable

[Stefano Babic]

Hi Fabio,

On 23/04/2015 19:18, Fabio Estevam wrote:

>> What about to export your is_hummingboard() function as U-Boot command ?
>> You can then use it in U-Boot scripts, and the correct fdt name can be
>> set in the "bootcmd" variable. Something like "if is_humming;then ..."
> 
> I am not sure how I can retrieve the returned value from
> is_hummingboard() as a U-boot command and use it inside a script?
> Maybe I did not understand your suggestion. Please advise.

U_BOOT_CMD returns a value that can be evaluated, exactly as we do with
"if tftp.." or for other commands. So you could implement:

U_BOOT_CMD(is_hummingbird, 1, 1, do_is_hummingbird, ..

and the do_is_hummingbird can return CMD_RET_SUCCESS or CMD_RET_FAILURE.
This is then evaluated in the script as "if is_hummingbird;then
fdt_file=....;else fdt_file=...;fi"

> 
>> And if a user wants to use other names, he can because it is not hard-coded.
> 
> Yes, I understand the concern, but in this specific case we are
> talking about a DTB file, which is board specific and cannot really
> change.

Well, maybe I am alone, but I am used to have several DTB files during
the developmnet phase - I agree with you that at the end there should be
only one DTB file.

Anyway, my was only a proposal - it is also fine if you decide to
maintain the current implementation.

Best regards,
Stefano Babic

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