[U-Boot] [PATCH v2] AT91: add RTT and GPBR based RTC

[Xu, Hong]

Hi Reinhard,

> -----Original Message-----
> From: Reinhard Meyer [mailto:u-boot at emk-elektronik.de] 
> Sent: Wednesday, August 25, 2010 10:23 AM
> To: Xu, Hong
> Cc: u-boot at lists.denx.de
> Subject: Re: [U-Boot] [PATCH v2] AT91: add RTT and GPBR based RTC
> 
> Dear Xu, Hong,
> > Some of Atmel's ARM926EJS chips have builtin RTC, for 
> example, SAM9G45 SAM9M10 SAM9RL and new X5 serials.
> > May we take this into account at this stage?
> Maybe you can help me here:
> the 9260 and the 9XE-ENG Sample (soldered on my EK) have the 
> GPBRs at 0xfffffd50.
> Its sold as a feature (but I think its a bug) that the 
> current Mask of the 9XE has the GPBRs at 0xfffffd60 
> (0xfffffd50 designated "reserved" now).
> Is there a simple way to distinguish between both masks?

Per the latest datasheet from Atmel's official website, 0xFFFFFD60 is GPBR base address for SAM9XE
0xFFFFFD50 is GPBR base address for SAM9260.

We'd use this for official EK board and forget Eng samples.

If you want to distinguish different chip revision, DBGU_CIDR and DBGU_EXID may help.

BR,
Eric

> Reinhard
>