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<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bjooky@gmail.com href="mailto:bjooky@gmail.com">Bjook</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=u-boot-users@lists.sourceforge.net
href="mailto:u-boot-users@lists.sourceforge.net">u-boot-users@lists.sourceforge.net</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 22, 2007 10:56
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [U-Boot-Users] Where in u-boot
is the RAM "Mode Register"programmed?</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">My question is: Where in u-boot is
the RAM “Mode Register” programmed? Also, is my PCB usable with its
mangled RAM address lines?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I am using the “at91rm9200dk”
configuration with a couple of changes. <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I ran into problems with the
RAM. We are using a 64Mbit MT48LC2M32 instead of the 128Mbit MT48LC8M32
which should not be a problem. Same chip except for half the
capacity.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">The only problem is my hardware
layout guy decided to mangle the address lines when he connected the RAM to
the ARM processor. His reasoning was that a RAM address is a RAM address
is a RAM address. If you always access the RAM from the Arm chip then
the mangled lines will always get decoded and you will get the correct data
value.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">What the layout guy did not
realize was that this RAM has a Mode Register that needs to be
programmed. Where does this happen in u-boot? If I can find out
where it is set then I can decode the mangled address lines and put the proper
value in.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Also I will set the <FONT
color=navy><SPAN style="COLOR: navy">“</SPAN></FONT>burst read<FONT
color=navy><SPAN style="COLOR: navy">”</SPAN></FONT> to
0.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Do you think this situation
salvageable? A10 is the same because it is a special li<FONT
color=navy><SPAN style="COLOR: navy">n</SPAN></FONT>e but I may need to jumper
A8 and A9 since it looks like they are only used to program the address
register.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">The mangled lines are as
follows<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><FONT face=Arial
size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Normal</SPAN></FONT></st1:City></st1:place><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> ->
Mangled<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">A0 ->
A1<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">A1 ->
A3<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">A2 ->
A2<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">A3 ->
A11<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">A4 ->
A7<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">A5 ->
A8<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">A6 ->
A6<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">A7 ->
A4<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">A8 ->
A9<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">A9 ->
A0<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">A10 ->
A10<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Next time I will fix the mangled
lines but I really need to prove out my design on <FONT color=navy><SPAN
style="COLOR: navy">my current </SPAN></FONT>50 boards since another spin
takes around a month (because of BGA chips).<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">-Bjook<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT></P></DIV></BLOCKQUOTE>
<DIV><FONT face=Arial size=2>You need to know what flash memory you are
using.</FONT></DIV>
<DIV><FONT face=Arial size=2>If you are using a dataflash, then it takes place
in dataflashboot.bin, not in U-Boot.</FONT></DIV>
<DIV><FONT face=Arial size=2>Otherwise you have to look at the
cpu/arm920t/at91rm9200 directory.</FONT></DIV>
<DIV><FONT face=Arial size=2>Should be an assembler file there. Dont remember
its name.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Best Regards<BR>Ulf
Samuelsson </FONT></DIV></BODY></HTML>