Re: N900 device tree conversion: how to do first step

From: Pavel Machek
Date: Sun Jun 09 2013 - 13:30:21 EST

On Sun 2013-06-09 03:59:44, Pavel Machek wrote:
> Hi!
> I'd like to convert Nokia N900 to device tree.
> Unfortunately, serial port is not easily available (very special cable
> would be needed, does someone know where to get one?) and I don't have
> BDI (and very special cable would be needed, too).
> So I tried doing very small first step, hoping that I get booting
> system... obviously I did not.
> I tried formally switching to device tree while still booting using
> hardcoded functions. No luck. Does anyone see what I did wrong?
> Is it possible that n900 has its main memory somewhere else than
> 0x80000000?

Interesting. It seems that memory setup from atags is indeed
0x8000 0000 size 0x0800 0000
0x8800 0000 size 0x0800 0000

. But hopefully that's just complicated way of saying
0x8000 0000 size 0x1000 0000


Anyway, I now see problem with my reasoning: kernel is full of

if (of_have_populated_dt())

tests, so it is impossible to switch to device tree, and still expect
old-style init to work :-(.


(cesky, pictures)
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