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<DIV><SPAN class=063034015-18042006><FONT face=Arial color=#0000ff size=2>When
is mentioned "cs" i meant the DDR bank cs bounds. In
cpu/mpc83xx/spd_ram.c.</FONT></SPAN></DIV>
<DIV><SPAN class=063034015-18042006><FONT face=Arial color=#0000ff size=2>They
are hardcoded to be 2 and 3. Shouldn't this come from the config ?
</FONT></SPAN></DIV>
<DIV><SPAN class=063034015-18042006><FONT face=Arial color=#0000ff
size=2>cpu/mpc83xx/spd_ram.c should be a common code for any 83xx based
board not only the freescale board which have the DDR module in the back of the
board.</FONT></SPAN></DIV>
<DIV><SPAN class=063034015-18042006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=063034015-18042006><FONT face=Arial color=#0000ff
size=2>cheers</FONT></SPAN></DIV>
<DIV><SPAN class=063034015-18042006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=063034015-18042006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
u-boot-users-admin@lists.sourceforge.net
[mailto:u-boot-users-admin@lists.sourceforge.net]<B>On Behalf Of </B>Ben
Warren<BR><B>Sent:</B> Tuesday, April 18, 2006 10:08 AM<BR><B>To:</B> Jerry Van
Baren<BR><B>Cc:</B> u-boot-users@lists.sourceforge.net<BR><B>Subject:</B> Re:
[U-Boot-Users] u-boot 834x spd_ram<BR><BR></FONT></DIV>Jerry,<BR><BR>The 83xx
chips have a separate memory bus for DDR, with its own chip selects. For
these chips, you do in fact need to use the local bus CS0 for your boot
flash/EEPROM.<BR><BR>I can't find anything in the manual that differentiates
between the DDR chip selects, so using CS2/3 was probably just a design
choice.<BR><BR>regards,<BR>Ben<BR><BR>On Tue, 2006-04-18 at 10:02 -0400, Jerry
Van Baren wrote:
<BLOCKQUOTE TYPE="CITE"><PRE><FONT color=#000000>Aziz Mzili wrote:</FONT>
<FONT color=#000000>> </FONT>
<FONT color=#000000>> Hi</FONT>
<FONT color=#000000>> </FONT>
<FONT color=#000000>> I'm wondering why in cpu/83xx/spd_ram.c we expect the DDR ram to be on </FONT>
<FONT color=#000000>> cs2 and cs3. Is there any issue with it on cs0 and cs1 ?</FONT>
<FONT color=#000000>> </FONT>
<FONT color=#000000>> thank you</FONT>
<FONT color=#000000>> </FONT>
<FONT color=#000000>> Aziz Mzili</FONT>
<FONT color=#000000>I'm not a 834x expert, but all my experience is that CS0 is used to boot </FONT>
<FONT color=#000000>the processor. If it is DDR RAM rather than flash, someone other than </FONT>
<FONT color=#000000>the 834x must initialize the DDR RAM and load it with the boot program. </FONT>
<FONT color=#000000> That is possible, but very uncommon.</FONT>
<FONT color=#000000>gvb</FONT>
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