[U-Boot] How can i add intterrupt for AT91SAM9260EK board

[Reinhard Meyer]

Alexander Stein wrote:
> Hello,
>
> Am Donnerstag, 29. Juli 2010, 08:25:53 schrieb Reinhard Meyer:
>   
>> You have add interrupt handling (write source) to AT91 in general and
>> provide a patch for that.
>>
>> But first you have to define why you need interrupts (in the u-boot
>> phase) in the first place.
>>     
>
> One reason would be to workaround errata 44.3.5.1 (RSTC: Reset During SDRAM 
> Accesses) on the AT91SAM9G20 which traps the reset interrupt to shutdown the 
> SDRAM controller properly -.-
>   
This problem exists in the 9260 and 9G20, I wonder if the 9XE has it, 
too (its not documented there).
However it would only prevent initial boot from external NOR or NAND 
flash. I am not sure if anyone does that... And -what if- a short 
brownout triggers a reset, but the SDRAM chips don't reset their state 
machines?

Then, that particular IRQ would not mean enabling IRQs for other devices 
in u-boot.
 I would probably add the code in such a manner (board.c) that it does 
not need CONFIG_USE_IRQ defined.

Reinhard