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Hi, Matt<br>
<br>
Thanks a lot for replying, your help is very much<br>
appreciated. I've followed your suggestion and now<br>
ioremap works as expected. I've removed ivocation<br>
of m4xx_map_io() replacing it by normal ioremaps<br>
for serial ports, RTC and ethernet adapter. <br>
<br>
It would be great to see this stuff cleaned up in 2.6.<br>
<br>
Felix.<br>
<br>
<br>
Matt Porter wrote:
<blockquote cite="mid20041109111707.A14471@home.com" type="cite">
<pre wrap="">On Tue, Nov 09, 2004 at 07:27:09PM +0200, Felix Radensky wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi, folks
I have a 405GPr based board with 512M of RAM.
My kernel is 2.4.17 from Monta Vista Linux 2.1.
I'm trying to reserve 64M on boot using mem=448M
and map it later by
ioremap(__pa(high_memory), 64*(1<<20));
This worked fine when system had 256M of RAM,
but now ioremap fails. If I understand the kernel
code correctly, by adding more RAM I've reduced
the vmalloc/ioremap space. I can also see that this
space is reduced dramatically on boot by mappings
done in arch/ppc/kernel/ppc4xx_setup.c:m4xx_map_io()
Is there any way to fix problem ? Is it necessary to have
a 1:1 virtual to physical mappings as its done in m4xx_map_io()
or maybe higher virtual addresses can be used, thus
allowing to save some precious ioremap space.
</pre>
</blockquote>
<pre wrap=""><!---->
This is exactly why the PPC44x ports don't use io_block_map()...
it can interfere with dynamic mappings. It is not necessary to
have 1:1 virtual to physical mappings nor is it necessary to
have m4xx_map_io() at all. One can use ioremap() to map any
space and let the kernel place things intelligently. In order
to use serial console you'll have to use early_serial_setup()
after you've ioremapped the UART...once you've removed the
io_block_map() call. Look at other ports to see how this is
done.
Someday I might get down my list to cleaning up 40x stuff in 2.6.
-Matt
</pre>
</blockquote>
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