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* RE: omap5912 and regular DDR
@ 2005-12-15 17:21 Hunter, Jon
  2005-12-19 12:53 ` Olav Kongas
  0 siblings, 1 reply; 6+ messages in thread
From: Hunter, Jon @ 2005-12-15 17:21 UTC (permalink / raw)
  To: Woodruff, Richard, Olav Kongas, linux-omap-open-source

Hi Olav, Richard,  

Unfortunately, I do not believe that we support this on the OMAP5912. My
understanding is that we only support regular SDR, mobile SDR and mobile
DDR. The description of the EMIFF interface in the data manual only
lists these. I also recall that we had said no to this in the past to
from another request. 

Regards,
Jon


> -----Original Message-----
> From: linux-omap-open-source-bounces@linux.omap.com 
> [mailto:linux-omap-open-source-bounces@linux.omap.com] On 
> Behalf Of Woodruff, Richard
> Sent: Thursday, December 15, 2005 10:45 AM
> To: Olav Kongas; linux-omap-open-source@linux.omap.com
> Subject: RE: omap5912 and regular DDR
> 
> I'll give my disclaimer that I don't have an OSK. Nor did I 
> look up the module capabilities, So I really don't know.
> 
> I would guess it should support DDR and mDDR.  The 
> initialization sequence as documented in TRM's and DDR data 
> sheets I've looked at are slightly different.
> 
> OMAP2 DDR controllers defiantly are designed to support both 
> though I've only seen mDDR on boards which I use.
> 
> Regards,
> Richard W.
> 
> > -----Original Message-----
> > From: linux-omap-open-source-bounces@linux.omap.com
> [mailto:linux-omap-
> > open-source-bounces@linux.omap.com] On Behalf Of Olav Kongas
> > Sent: Thursday, December 15, 2005 10:32 AM
> > To: linux-omap-open-source@linux.omap.com
> > Subject: omap5912 and regular DDR
> > 
> > Hi,
> > 
> > omap5912 supports mobile DDR, OSK devel boards have it.
> > However, it is unclear to me from omap docs, whether the 
> chip supports 
> > regular DDR. Yes, I know, my questions should be destined to the TI 
> > support, but you know, I really have got real (omap) help only from 
> > this list.
> > 
> > 1. Is regular DDR known to work on omap5912 (or known not 
> to work). If 
> > it works then ...
> > 
> > 2. is there anything tricky to get the regular DDR working
> > 
> > 3. has anybody a working DDR initialization code for omap5912.
> > 
> > Thanks in advance,
> > Olav
> > _______________________________________________
> > Linux-omap-open-source mailing list
> > Linux-omap-open-source@linux.omap.com
> > http://linux.omap.com/mailman/listinfo/linux-omap-open-source
> _______________________________________________
> Linux-omap-open-source mailing list
> Linux-omap-open-source@linux.omap.com
> http://linux.omap.com/mailman/listinfo/linux-omap-open-source
> 

^ permalink raw reply	[flat|nested] 6+ messages in thread
* RE: omap5912 and regular DDR
  2005-12-15 17:21 omap5912 and regular DDR Hunter, Jon
@ 2005-12-19 12:53 ` Olav Kongas
  0 siblings, 0 replies; 6+ messages in thread
From: Olav Kongas @ 2005-12-19 12:53 UTC (permalink / raw)
  To: Hunter, Jon; +Cc: linux-omap-open-source



On Thu, 15 Dec 2005, Hunter, Jon wrote:

> Unfortunately, I do not believe that we support this on the OMAP5912. My
> understanding is that we only support regular SDR, mobile SDR and mobile
> DDR. The description of the EMIFF interface in the data manual only
> lists these. I also recall that we had said no to this in the past to
> from another request. 

Hi Jon, Richard,

Jon, thanks for the information.

We have developed a board on which we use regular DDR 
MT46V16M16TG, attached to omap5912. Last Friday I got the 
DDR working and till now the u-boot's alternative (more 
thorough) memory test has been running flawlessly for about 
72 hours. Though I don't think anyone is stupid enough to 
knowingly design for unsupported memory type, it seems at 
least until now that it can be done with the above memory.

Jon, I would most appreciate if you could find out and 
reveal the reason, why rDDR is not officially supported on 
omap5912. 

Thanks in advance,
Olav

^ permalink raw reply	[flat|nested] 6+ messages in thread
* RE: omap5912 and regular DDR
  2005-12-20 16:37 Hunter, Jon
@ 2005-12-20 18:51 ` Olav Kongas
  0 siblings, 0 replies; 6+ messages in thread
From: Olav Kongas @ 2005-12-20 18:51 UTC (permalink / raw)
  To: Hunter, Jon; +Cc: linux-omap-open-source



On Tue, 20 Dec 2005, Hunter, Jon wrote:

> > Jon, I would most appreciate if you could find out and reveal 
> > the reason, why rDDR is not officially supported on omap5912. 
> 
> 
> I doubled checked on this as it had been sometime since I had looked at
> this. However, the official statement still is that we do not support
> ddr1. The problem is that the internal i/o buffer on the 5912 will not
> meet the JEDEC spec for ddr1. It could be possible that it may work,
> however, we cannot guarantee across all devices produced that it will
> work as there will be some variation in the silicon between parts. 

Jon, thank you so much.

Olav

^ permalink raw reply	[flat|nested] 6+ messages in thread
* RE: omap5912 and regular DDR
@ 2005-12-20 16:37 Hunter, Jon
  2005-12-20 18:51 ` Olav Kongas
  0 siblings, 1 reply; 6+ messages in thread
From: Hunter, Jon @ 2005-12-20 16:37 UTC (permalink / raw)
  To: Olav Kongas; +Cc: linux-omap-open-source

Hi Olav,

> We have developed a board on which we use regular DDR 
> MT46V16M16TG, attached to omap5912. Last Friday I got the DDR 
> working and till now the u-boot's alternative (more
> thorough) memory test has been running flawlessly for about
> 72 hours. Though I don't think anyone is stupid enough to 
> knowingly design for unsupported memory type, it seems at 
> least until now that it can be done with the above memory.
> 
> Jon, I would most appreciate if you could find out and reveal 
> the reason, why rDDR is not officially supported on omap5912. 


I doubled checked on this as it had been sometime since I had looked at
this. However, the official statement still is that we do not support
ddr1. The problem is that the internal i/o buffer on the 5912 will not
meet the JEDEC spec for ddr1. It could be possible that it may work,
however, we cannot guarantee across all devices produced that it will
work as there will be some variation in the silicon between parts. 

Regards,
Jon
 

^ permalink raw reply	[flat|nested] 6+ messages in thread
* RE: omap5912 and regular DDR
@ 2005-12-15 16:44 Woodruff, Richard
  0 siblings, 0 replies; 6+ messages in thread
From: Woodruff, Richard @ 2005-12-15 16:44 UTC (permalink / raw)
  To: Olav Kongas, linux-omap-open-source

I'll give my disclaimer that I don't have an OSK. Nor did I look up the
module capabilities, So I really don't know.

I would guess it should support DDR and mDDR.  The initialization
sequence as documented in TRM's and DDR data sheets I've looked at are
slightly different.

OMAP2 DDR controllers defiantly are designed to support both though I've
only seen mDDR on boards which I use.

Regards,
Richard W.

> -----Original Message-----
> From: linux-omap-open-source-bounces@linux.omap.com
[mailto:linux-omap-
> open-source-bounces@linux.omap.com] On Behalf Of Olav Kongas
> Sent: Thursday, December 15, 2005 10:32 AM
> To: linux-omap-open-source@linux.omap.com
> Subject: omap5912 and regular DDR
> 
> Hi,
> 
> omap5912 supports mobile DDR, OSK devel boards have it.
> However, it is unclear to me from omap docs, whether the
> chip supports regular DDR. Yes, I know, my questions should
> be destined to the TI support, but you know, I really have
> got real (omap) help only from this list.
> 
> 1. Is regular DDR known to work on omap5912 (or known not
> to work). If it works then ...
> 
> 2. is there anything tricky to get the regular DDR working
> 
> 3. has anybody a working DDR initialization code for
> omap5912.
> 
> Thanks in advance,
> Olav
> _______________________________________________
> Linux-omap-open-source mailing list
> Linux-omap-open-source@linux.omap.com
> http://linux.omap.com/mailman/listinfo/linux-omap-open-source

^ permalink raw reply	[flat|nested] 6+ messages in thread
* omap5912 and regular DDR
@ 2005-12-15 16:32 Olav Kongas
  0 siblings, 0 replies; 6+ messages in thread
From: Olav Kongas @ 2005-12-15 16:32 UTC (permalink / raw)
  To: linux-omap-open-source

Hi,

omap5912 supports mobile DDR, OSK devel boards have it. 
However, it is unclear to me from omap docs, whether the 
chip supports regular DDR. Yes, I know, my questions should 
be destined to the TI support, but you know, I really have 
got real (omap) help only from this list.

1. Is regular DDR known to work on omap5912 (or known not 
to work). If it works then ...

2. is there anything tricky to get the regular DDR working

3. has anybody a working DDR initialization code for 
omap5912. 

Thanks in advance,
Olav

^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2005-12-20 18:51 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-12-15 17:21 omap5912 and regular DDR Hunter, Jon
2005-12-19 12:53 ` Olav Kongas
  -- strict thread matches above, loose matches on Subject: below --
2005-12-20 16:37 Hunter, Jon
2005-12-20 18:51 ` Olav Kongas
2005-12-15 16:44 Woodruff, Richard
2005-12-15 16:32 Olav Kongas

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