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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi all,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am currently working on a PPC440SPe based custom board to
bring up the System ACE interface from Linux.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am using linux-2.6.16 with the patch applied as per <span
class=SpellE>Ameet’s</span> suggestion from the following link<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<pre><i><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-style:italic'><a
href="https://www.cs.york.ac.uk/rtslab/demos/amos/xupv2pro/patches/linuxppc-2.6.17.1-sysace-1.1.patch">https://www.cs.york.ac.uk/rtslab/demos/amos/xupv2pro/patches/linuxppc-2.6.17.1-sysace-1.1.patch</a><o:p></o:p></span></font></i></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>We are able to access the controller registers from u-boot, but kernel throws a “Data Machine Check exception” while accessing the registers.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1;tab-stops:
list .5in left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><![if !supportLists]><font
size=2 face="Courier New"><span style='font-size:10.0pt;mso-fareast-font-family:
"Courier New"'><span style='mso-list:Ignore'>1.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>I have set up System ACE base address as 0xE000_0000 (which is the same as in u-boot).<o:p></o:p></pre><pre
style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1;tab-stops:
list .5in left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><![if !supportLists]><font
size=2 face="Courier New"><span style='font-size:10.0pt;mso-fareast-font-family:
"Courier New"'><span style='mso-list:Ignore'>2.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>As far as I understand, kernel should pick-up TLB settings from u-boot.<o:p></o:p></pre><pre
style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1;tab-stops:
list .5in left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><![if !supportLists]><font
size=2 face="Courier New"><span style='font-size:10.0pt;mso-fareast-font-family:
"Courier New"'><span style='mso-list:Ignore'>3.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>But , while debugging through BDI this is what I observe:<o:p></o:p></pre><pre
style='margin-left:.5in'><b style='mso-bidi-font-weight:normal'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-weight:bold;mso-bidi-font-weight:
normal'><o:p> </o:p></span></font></b></pre><pre style='margin-left:.5in'><b
style='mso-bidi-font-weight:normal'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-weight:bold;mso-bidi-font-weight:normal'>TLB entry Listings from u-boot</span></font></b>:<o:p></o:p></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'>IDX TID<span style='mso-spacerun:yes'> </span><span
class=GramE>EPN<span style='mso-spacerun:yes'> </span>SIZE</span> VTS<span style='mso-spacerun:yes'> </span>RPN<span style='mso-spacerun:yes'> </span>USER WIMGE USRSVC<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>0 :</span> 00 ff000000<span style='mso-spacerun:yes'> </span>16MB V0 -> 4_ff000000 U:0000 WI-G- XWRXWR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>1 :</span> 00 00000000 256MB V0 -> 0_00000000 U:0000 -I-G- XWRXWR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>2 :</span> 00 10000000 256MB V0 -> 0_10000000 U:0000 -I-G- XWRXWR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>3 :</span> 00 20000000 256MB V0 -> 0_20000000 U:0000 -I-G- XWRXWR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>4 :</span> 00 30000000 256MB V0 -> 0_30000000 U:0000 -I-G- XWRXWR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>5 :</span> 00 90000000 256KB V0 -> 4_00000000 U:0000 -I--- XWRXWR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>6 :</span> 00 e0000000<span style='mso-spacerun:yes'> </span>1KB V0 -> 4_e0000000 U:0000 -I-G- XWRXWR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><span class=GramE><b style='mso-bidi-font-weight:normal'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-weight:bold;
mso-bidi-font-weight:normal'>Note</span></font></b> :</span> 6<sup>th</sup> entry is for system ACE.<o:p></o:p></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><b style='mso-bidi-font-weight:normal'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-weight:bold;mso-bidi-font-weight:
normal'>TLB entry <span class=GramE>Listings <span style='mso-spacerun:yes'> </span>from</span> Kernel</span></font></b>:<o:p></o:p></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'>IDX TID<span style='mso-spacerun:yes'> </span><span
class=GramE>EPN<span style='mso-spacerun:yes'> </span>SIZE</span> VTS<span style='mso-spacerun:yes'> </span>RPN<span style='mso-spacerun:yes'> </span>USER WIMGE USRSVC<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>0 :</span> 00 00000000<span style='mso-spacerun:yes'> </span>1KB -0 -> 4_ff000000 U:0000 WI-G- XWRXWR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>1 :</span> 00 fdfff000<span style='mso-spacerun:yes'> </span>4KB V0 -> 4_f0000000 U:0000 -IMG- ----WR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>2 :</span> 00 fdffe000<span style='mso-spacerun:yes'> </span>4KB V0 -> 4_f0000000 U:0000 -IMG- ----WR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>3 :</span> 00 fdffd000<span style='mso-spacerun:yes'> </span>4KB V0 -> 4_f0000000 U:0000 -IMG- ----WR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>4 :</span> 00 e1000000<span style='mso-spacerun:yes'> </span>4KB V0 -> 0_e0000000 U:0000 -IMG- ----WR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>5 :</span> 00 00000000<span style='mso-spacerun:yes'> </span>1KB -0 -> 4_00000000 U:0000 -I--- XWRXWR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> <span class=GramE>6 :</span> 00 00000000<span style='mso-spacerun:yes'> </span>1KB -0 -> 4_e0000000 U:0000 -I-G- XWRXWR<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><b style='mso-bidi-font-weight:normal'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-weight:bold;mso-bidi-font-weight:
normal'>Note</span></font></b>: 4<sup>th</sup> entry is system ACE.<o:p></o:p></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'>The RPN and access permissions are totally different for System ACE from u-boot and kernel. I u-boot it is – <b
style='mso-bidi-font-weight:normal'><span style='font-weight:bold;mso-bidi-font-weight:
normal'>4_<span class=GramE>e0000000<span style='font-weight:normal'> ,</span></span></span></b> and in kernel it is <b
style='mso-bidi-font-weight:normal'><span style='font-weight:bold;mso-bidi-font-weight:
normal'>0_e0000000</span></b><o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'>I think this is the issue, causing exception during writes to registers from kernel.<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'>Could someone throw some light on this area? This is very critical for us now.<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'>Or am I missing something?<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'>Any help would be appreciated.<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'>Thanks in advance<o:p></o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'>Junita<o:p></o:p></span></font></pre></div>
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