> Everybody knows how to add Timer Interrupt to the u-boot?
> I wrote a fuction called timer0_isr(), and wanted to add it to Uboot,
> but I didn't know what to do, Does the uboot has a funciton like
> function request_irq() in linux kernel?
As Jerry told you, U-Boot generally avoids using interrupts.
For some architectures however we have code to allow using interrupts,
e.g. from standalone applications. You can look at
examples/interrupt.c which effectively was written with
cpu/mpc5xxx/interrupts.c in mind. The latter was of course derived
from the Linux version so it shouldn't be a big problem to do
something similar for other architectures.
Once the implementation is up and running, it is still a trick to keep it
running. In a normal, closed implementation, this is not a problem; in a
system with metaobject protocols [..] there is the potential for spectacular
failure modes if certain situations are not properly anticipated.
-- The Art of the Metaobject Protocol
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