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<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Hi Henry. I recently migrated to
ARCH=powerpc on 2.6.24 from ARCH=ppc on 2.6.16 (having obtained a distribution
from the ltib project).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>The ppc architecture is nearing end-of-life
as far as development goes, so I recommend jumping to powerpc now. In mey
recent experience I encountered better driver support, and I generally noticed
that future patching/development would support ARCH=powerpc. I think the old
ppc implied embedded (or non-mac) architectures, while the powerpc was intended
for mac desktops. I might be wrong, but it looks like the two have merged.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>This architecture issue doesn’t speak
directly to your question, but if you could get 2.6.25 working with
ARCH=powerpc on your lite5200b then you and I would be working with basically
the same set-up and I could help you better. For now, here are a few questions:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=3 color=navy face="Times New Roman"><span style='font-size:12.0pt;
color:navy'><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]><font
color=navy><span style='color:navy'>Have you successfully NFS mounted your
rootfs and not woried about the RAMdisk at this point?<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><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]><font
color=navy><span style='color:navy'>Maybe you are using ARCH=powerpc, but your
comment </span></font>in /arch/ppc/configs/ has me confused. Did you mean in
/arch/powerpc/configs/ ?<o:p></o:p></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'>Please clarify if you are using
ARCH=powerpc and I think I can be of more assistance. For example, on my 2.6.24
kernel I needed to…<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=3 color=navy face="Times New Roman"><span style='font-size:12.0pt;
color:navy'><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]><font
color=navy><span style='color:navy'>Halve the memory sive specified in
lite5200b.dts. It specified twice as much memory as is actually on my
lite5200b, causing a strange, long delay at boot time as page initialization
attempted to operate on a bunch of non-existent memory, near as I can tell. The
symptom was around 30-45 seconds of delay between U-boot boot and any console
output. Weird, but I figured it had something to do with RAM initialization
only after getting my BDI2000 JTAG debugger going and breaking to see that the
kernel appears stuck on something related to initializing the RAM. This drove
me to discover the size spec is wrong in the dts file.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><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]><font
color=navy><span style='color:navy'>If you need edge-sensitive interrupts you’ll
need a set interrupt type callback. Mpc52xx_pic.c is missing this callback.
Check another powerpc architecture for set_interrupt_type. I would upload a
patch but it turns out I am fine with level-sensitive only so I didn’t go
through the trouble of formalizing a fix for this.</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><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]><font
color=navy><span style='color:navy'>SPI driver for SPI peripheral (not PSC): this
is missing but there is a patch for it. Tell me if you need it and I’ll
direct you).</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><span
style='mso-list:Ignore'>4)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
color=navy><span style='color:navy'>IN GENERAL, THE DEVICE TREE CONCEPT IS
COOL, BUT IT HAS A LEARNING CURVE. I can help you. For example, just requesting
an external IRQ requires creating a “device” node so that you can
associate a specific IRQ number with said device for easy access from your
module driver code at run time. Basically, ALL register access is done by
run-time parsing of the device tree information, NOT by simply direct register
access, given a bunch of defined address constants in some header file.</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.25in'><font size=3 color=navy
face="Times New Roman"><span style='font-size:12.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.25in'><font size=3 color=navy
face="Times New Roman"><span style='font-size:12.0pt;color:navy'>Sorry if none
of this helps, but I just recently clawed my way up the learning curve so some
of the wounds are fresh. Hopefully I can provide a bit of guidance on the easy
concepts.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.25in'><font size=3 color=navy
face="Times New Roman"><span style='font-size:12.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.25in'><font size=3 color=navy
face="Times New Roman"><span style='font-size:12.0pt;color:navy'>-Mike</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><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'>
linuxppc-embedded-bounces+mike_timmons=trimble.com@ozlabs.org
[mailto:linuxppc-embedded-bounces+mike_timmons=trimble.com@ozlabs.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Henry Chen<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, June 03, 2008 9:55
PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">linuxppc-embedded@ozlabs.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Is the linux-2.6.25.4
compatible with freescale lite5200b?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hi, all expert!<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Thank you for your patience.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I want to use Linux as the OS of freescale lite5200b develop board.
Then I have tried two version of kernel, <a href="http://2.6.25.4">2.6.25.4</a>
and <a href="http://2.4.25.">2.4.25.</a><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>We succeed in 2.4.25, failed in <a href="http://2.6.25.4">2.6.25.4</a>. We
use the default config file for the board, lite5200_defconfig, which would
be found both in /arch/ppc/configs/. And we use the same ramdisk. The following
info is about the error of <a href="http://2.6.15.4">2.6.15.4</a>.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><em><i><font size=3 face=monospace><span style='font-size:
12.0pt;font-family:monospace'>=> bootm fe000000 fe200000
</span></font></i></em><i><font face=monospace><span style='font-family:monospace;
font-style:italic'><br>
<em><i><font face=monospace><span style='font-family:monospace'>## Booting image
at fe000000 ...
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>
Image Name: Linux-2.6.25
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>
Image Type: PowerPC Linux Kernel Image (gzip compressed)
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>
Data Size: 802989 Bytes = 784.2 kB
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>
Load Address: 00000000
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>
Entry Point: 00000000
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>
Uncompressing Kernel Image ... OK
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>## Loading
RAMDisk Image at fe200000 ...
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>
Image Name: rootfs in flash
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>
Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>
Data Size: 5055519 Bytes = 4.8 MB
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>
Load Address: fe5a0000
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>
Entry Point: fe5a0000
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>
Loading Ramdisk to 0fa7c000, end 0ff4e41f ... OK
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>id mach(): done
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>MMU:enter
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>MMU:hw init
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>MMU:mapin
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>MMU:setio
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>MMU:exit
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>setup_arch:
enter
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>setup_arch:
bootmem
</span></font></i></em><br>
<em><i><font face=monospace><span style='font-family:monospace'>arch: exit</span></font></i></em></span></font></i><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Would you please help us to solve it and explain the cause?<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Best regards!<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Sincerely yours,<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Henry<o:p></o:p></span></font></p>
</div>
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