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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>There is an error in the spd_sdram.c<font color=blue><span
style='color:blue'> in cpu/ppc4xx/,</span></font> file in a loop statement that
is wrong if you are using two Dimms.</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>It missing initializing a part of the second dimm. So if you have
a 1gig of memory it will show up as 768Megs.</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Without the patch it initializing like this:</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>0 = 256M</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>1 = 256M</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>1= 256M</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>2= 256M</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Total 768M</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>With the patch:</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>0= 256M</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>1=256M</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>2=256M</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>3=256M</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Total 1024M</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Gerald</span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
u-boot-users-bounces@lists.sourceforge.net on behalf of Gerald Jackson<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sun 10/1/2006 3:17 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Stefan Roese;
u-boot-users@lists.sourceforge.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [U-Boot-Users] (no
subject)</span></font></p>
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<p><font size=2 face="Times New Roman"><span style='font-size:10.0pt'>Stefan,<br>
<br>
Thank you for the init.S file. But the problem still persists.<br>
<br>
Here is what I get:<br>
U-Boot 1.1.4 (Oct 1 2006 - 02:58:55)<br>
<br>
CPU: AMCC PowerPC 440GX Rev. F at 800 MHz (PLB=160, OPB=80, EBC=40<br>
MHz)<br>
I2C boot EEPROM enabled<br>
Internal PCI arbiter enabled<br>
32 kB I-Cache 32 kB D-Cache<br>
Board: Ocotea - AMCC PPC440GX Evaluation Board<br>
I2C: ready<br>
DRAM: DIMM slot 0: populated<br>
DIMM slot 1: populated<br>
DIMM slot 0: DDR SDRAM detected<br>
DIMM slot 1: DDR SDRAM detected<br>
DIMM 0 voltage level supported.<br>
Finish program_cfg0<br>
Finish program_cfg1<br>
Finish program_rtr<br>
tr0: 410b401a<br>
Finish program_tr0<br>
Finish program_bxcr Total_Size 805306368 <----
Here is part of the<br>
problem this should return about a 1Gig of memory but it only returns<br>
805Megs. <br>
<br>
If I try only one dimm and move it to either slot it shows the correct<br>
amount but with two dimms the calculation is wrong.<br>
<br>
It seems like I am miss about two (or one) banks from the Dimm which I<br>
assume equals 256M.<br>
<br>
I am still working on what is causing the wrong amount.<br>
<br>
Gerald<br>
<br>
<br>
<br>
<br>
<br>
<br>
-----Original Message-----<br>
From: Stefan Roese [<a href="mailto:sr@denx.de">mailto:sr@denx.de</a>]<br>
Sent: Sunday, October 01, 2006 2:00 PM<br>
To: u-boot-users@lists.sourceforge.net<br>
Cc: Gerald Jackson<br>
Subject: Re: [U-Boot-Users] (no subject)<br>
<br>
Hi Gerald,<br>
<br>
On Sunday 01 October 2006 19:15, Gerald Jackson wrote:<br>
> I look more into using both dimms issue and I see two interesting<br>
> things.<br>
><br>
> 1. With two dimms it never get pass line 1478 - 1500 in spd_sdram.c.<br>
It<br>
> loops once then hangs.<br>
><br>
> 2. If I disable this part (ie break) I get the ERROR: Cannot determine<br>
a<br>
> common read delay. If I comment out the hang() It returns but it
only<br>
> calculated 768MB of memory.<br>
<br>
Only 768MB? Does this mean you are using more than 512MB? As I mentioned<br>
<br>
earlier, this can't work right now. The TLB setup is for a max. of<br>
512MB.<br>
<br>
Please try the attached init.S file. It fixes the issue mentioned by<br>
Marc<br>
Howard _and_ adds TLB entries for a max. of 1GB of DDR. It will be<br>
checked<br>
into the official git tree in a few days.<br>
<br>
Please let me know if this changes anything.<br>
<br>
Best regards,<br>
Stefan<br>
<br>
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