ext Tony Lindgren wrote:
* Roger Quadros <roger.quadros@xxxxxxxxx> [100419 05:06]:
Balbi Felipe (Nokia-D/Helsinki) wrote:
Hi,
On Mon, Apr 19, 2010 at 01:49:15PM +0200, ext Arnaud Ebalard wrote:
Nokia N900 is shipped to users with a 2.6.28 omap kernel. Many patches
for the hardware and various features have been pushed upstream by Nokia
developers and possibly others. Those are now available in current l-o
tree.
Nonetheless, many drivers and various features are still missing
upstream. Simply put, one cannot expect to run a current l-o kernel on
the device (and expect to get a GUI and/or make call with the device).
tell me about it :-p
Thing is that it doesn't really depend only on Nokia to get those
parts done. Well, we can get the kernel part done by just cleaning
up and porting the 2.6.28 drivers to current mainline, but in case
of e.g. SGX we still miss the xorg driver and I don't think
that'll be released any time soon.
Another problem is that the bootloader believes it can pass all
the obsoleted OMAP TAGs to kernel and the 2.6.28 kernel depends on
those, maybe that can be worked around. I don't know whether
kernel simply drops invalid TAGs or not...
Yes kernel simply drops unrecognized TAGs and just prints a warning message.
All the the custom tags should be replaced with platform_data.
If something is needed for revision detection of the board,
there is arm-linux common ATAG_REVISION.
However, also Maemo userspace depends on some things set by the
custom tags. As this is non-standard, we should not spend much
effort on that. Instead we should concentrate on making N900
work with any distro the standard Linux way.
So I recommend using kexec patched Maemo kernel, then boot the
new mainline kernel from Maemo kernel and mount root directly
on the eMMC.
FYI. kexec-tools will be available in maemo.org repo soon and you can also
expect kexec patched kernel to be available.
Then we need a kexec helper utility that parses /proc/atags and feeds the
necessary stuff on Command line for the new kernel.
So the ATAG Hacks will be unnecessary.
cheers,
-roger
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