Hello.
I'm in for a porting Linux on board hosting System-on-Chip IC made by

LG - LGMM3001, based on ARM926EJ-S, running at 216MHz. Only uCos has

been ported on the board so far (not by me).
This is my first experience of Linux porting, though I wrote a few not

very complex drivers a couple of years ago for 2.4.x kernel and worked

mainly on application layer since then.
I'm now reading "Embedded Linux System Design and Development" by P.

Raghavan and Sriram Neelakandan and a few articles I found on Web, but

anyway there are lots of questions arose. Right now I want to clear a

few major ones:
- what kernel version to choose. I understand it depends on system

requirements and hardware specs, and I think 2.6.x branch should be

given a preference, as it supports a lot more hardware then 2.4 and

community provides better support as well :) Question is what version

of 2.6.x family to choose, is there a strict criterion to choose ?
- what bootloader can you recommend to choose for porting on the

board? There are U-boot, Redboot and ARMboot as the most common and

portable. I briefly check the Web Links and found that only U-Boot

supports ARM9, am I right?
- I mentioned above about uCos - is it reasonable trying to port uCos

device drivers on to the Linux platform, or drivers should be

rewritten from scratch, as uCos and Linux architectures I guess are

quite different ?
Thanks in advance and looking forward to getting answers to my queries!
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Roman Mashak
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Always choose the latest version . the bugs are fixed and new device
since the board is ported to uCos it should be using the reboot as

default bootloader. so you can use the same. insted of porting it.
reboot supports linux too. just port the linux and run it over the
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H. Mohamed Thalib
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A slight adjustment might be that there is generally a version that most

big distributions agree on (at the moment I believe it's v25) and those

will get longer support (and more external patches made ready for it).
Might be somewhat easier to support for a bit longer therefore. Whether

or not that's important to you ofcourse fully depends on your local use.

If you don't expect to upgrade a once-built board for another few years

or so anyway, any advantage is gone as by that time any current kernel

is obsolete. In that case, "latest" definitely tends to be the best choice.
Rene.
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Le Thu, 14 Aug 2008 01:28:32 -0700,
The latest -rc version, or Linus git tree. During the development work,

don't stay on a fixed version: keep your patches updated until you

submit them for inclusion. For more details, ask on the

linux-arm-kernel mailing list
Don't know about uCos, so I can't tell. Anyway you also need to make

sure that the license of your uCos drivers is GPLv2, another

compatible license, or that you are the author of these drivers and

that you can re-license them under GPLv2.
Sincerly,
Thomas

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Thomas Petazzoni, Free Electrons

Kernel, drivers and embedded Linux development,

consulting, training and support.

http://free-electrons.com
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