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From: Orjan Friberg <of@flatfrog.com>
To: barebox@lists.infradead.org
Subject: BeagleBoard sdrc init writes reserved values
Date: Wed, 10 Nov 2010 09:55:21 +0100	[thread overview]
Message-ID: <4CDA5DF9.7050906@flatfrog.com> (raw)

In sdrc_init in board-beagle.c both

         writel(0x1A, SDRC_REG(SYSCONFIG));

and

         writel(0x18, SDRC_REG(SYSCONFIG));

sets bits 4:3 in the IDLEMODE field.  The OMAP3 TRM (spruf98k) defines 
0x2 as the only valid value for this field, all others being marked as 
"reserved - do not use".  board-omap3evm.c does the same thing, 
board-sdp343x.c does not.

Anyone knows where these settings come from?  Derived from an older 
version of the TRM?  (I'm thinking there may have been a feature that 
was discovered to be unreliable or not working as intended so it was 
removed from the docs.)

Thanks,
Orjan


-- 
Orjan Friberg
FlatFrog Laboratories AB

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             reply	other threads:[~2010-11-10  8:55 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-11-10  8:55 Orjan Friberg [this message]
2010-11-10 15:11 ` BeagleBoard sdrc init writes reserved values Sascha Hauer
2010-11-10 16:13   ` Anand Gadiyar
2010-11-11 11:55     ` Orjan Friberg

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