From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jerry Van Baren <gvb.uboot@gmail.com>
Date: Fri, 27 Jul 2007 08:57:33 -0400
Subject: [U-Boot-Users] How to add Timer Interrupt to u-boot?
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To: u-boot@lists.denx.de

Robert wrote:
> Hello all:
> 
>     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?
>     Thanks in advance!
> 
> With kind regards,
> 
> Robert Xia 

Hi Robert,

Interrupts are not used by u-boot (with some rare exceptions). 
Generally things poll and there is usually some type of counter register 
(processor or board-specific) for measuring elapsed time.

If you really need interrupts, you will probably have to set up the 
vectors, interrupt registers, etc. yourself.

Best regards,
gvb