From: Sascha Hauer <s.hauer@pengutronix.de>
To: Orjan Friberg <of@flatfrog.com>
Cc: barebox@lists.infradead.org
Subject: Re: BeagleBoard sdrc init writes reserved values
Date: Wed, 10 Nov 2010 16:11:06 +0100 [thread overview]
Message-ID: <20101110151106.GT6017@pengutronix.de> (raw)
In-Reply-To: <4CDA5DF9.7050906@flatfrog.com>
Hi Orjan,
On Wed, Nov 10, 2010 at 09:55:21AM +0100, Orjan Friberg wrote:
> 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.)
I have no idea. I'm pretty sure though that the value has been copied
from some version of U-Boot or Xloader.
Sascha
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next prev parent reply other threads:[~2010-11-10 15:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-10 8:55 Orjan Friberg
2010-11-10 15:11 ` Sascha Hauer [this message]
2010-11-10 16:13 ` Anand Gadiyar
2010-11-11 11:55 ` Orjan Friberg
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