[U-Boot-Users] question about interrupt

[Chetan Nanda]

On Tue, May 20, 2008 at 2:53 PM, Wolfgang Denk <wd at denx.de> wrote:
> In message <7f245da80805200136y297e5309k110f1b193981ac16 at mail.gmail.com> you wrote:
>>
>> as i have mentioned, u-boot do not handle any interrupt, and neither
>
> In this general form, the statement is wrong.
>
> Depending on architecture, U-Boot does implement and use  interrupts.
> It  even exports an interface to standalone applications which allows
> to register custom interrupt handlers.

So if someone enable a interrupt and handled it properly then at the
time of interrupt handler will be called, but how then control reaches
back to u-boot original task that was running prior to interrupt
delivery? I mean who is taking care of context switch at the time of
interrupts?

>
> It's just just most U-Boot drivers do not use interrupts but polling
> mode - note that there are exceptions from this rule, too.
>
> Best regards,
>
> Wolfgang Denk
>
> --
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
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