On 05/15/2013 07:55 AM, Sascha Hauer wrote:
Is it possible to remap the registers using the kwbimage tool? That way
every code that runs would see the desired register layout.
Although possible, I prefer a different approach:
- IIRC all MVEBU SoCs boot up at 0xd0000000
- Have a regbase variable within barebox that initially points to that
- Have a mvreadl/mvwritel that adds it to reg offsets
- Rewrite _initial_ SoC code to use mvreadl/mvwritel
I applied this series, but please get this topic done before more code
enters that has to be changed when doing the above.
Sascha,
it's not that easy as I thought. Armada 370 behaves very different
from Dove here. While Dove allows to read from unmapped adresses,
Armada 370 hangs immediately.
I will work with Thomas on this asap and find a solution, but I am
not sure if it will work without dirty tricks. Thomas has one in
mind and I tend to agree with him on this one.
Further, yesterday when I played with Armada 370 I wasn't able to
have it boot with a variable pointer but the same code boots with
a pointer that never gets modified. Haven't investigated more, but
if we remap first thing after boot, that can remain constant at the
remapped reg base.
Sebastian
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