[U-Boot] [PATCH] make hang() a weak function

[Wolfgang Denk <wd@denx.de>]

Dear Andreas,

In message <516D62E1.7090306@gmail.com> you wrote:
>
> But how about other places in u-boot hang()ing the device? How can we
> tell the user that state without a terminal? If one plugs a uart cable
> he might see some cause of the hang() but this is not acceptable for
> some groups of users.
> Is it wise to completely stop a device without showing the state to the
> user?

If you want to tell the user, this should be done _before_ calling
hang() - if you decide to hang() your board.  Keep in mind that you
don't have to define CONFIG_PANIC_HANG.

Also, as done in arch/powerpc/lib/board.c we usually print an error
message on the console device, and we can call bootstage_error(),
which could initialte such actions.

> This question is a bit hypothetical cause we should eliminate the root
> causes for hang()s before going to market. However I would like to hear
> your thoughts about that.

You cannot eliminate all causes that will lead a board to run into
hang().  There may be simply broken hardware, for example...

Best regards,

Wolfgang Denk

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