On 11/2/21 11:49 AM, Martin Schiller wrote:
I have now found the cause of my boot problems with linux 5.10.
(see [1] for reference)
By changing the TEXT_OFFSET to 0x0 (instead of 0x80000 before) in the
upstream
commit [2] and deactivated kernel option CONFIG_RELOCATABLE the system
could not
boot.
Thus, we now need to set the KERNEL_LOADADDR to 0x80000000 in the
layerscape
target for kernel >= 5.8. (ATTENTION: but then kernel 5.4 can no longer
boot).
You could set this depending on the config option CONFIG_LINUX_5_10.
In addition, we should think about enabling CONFIG_RELOCATABLE in
general to
avoid being completely in the dark in case of similar problems in the
future.
Activating CONFIG_RELOCATABLE for layerscape should be ok, but I would
not activate it for all targets. We tried to make a MIPS target use
kASLR which is CONFIG_RELOCATABLE, and it was not easy to make it boot
up again. We ran into many problems with the early boot process and the
memory relocation. On ARM64 devices with a lot of memory this should be
easier.
The MIPS KConfig help also says this:
> The relocations make the kernel binary about 15% larger, but are
> discarded at runtime
Also, I am currently very unhappy with how the kernel patches are
handled in the
layerscape target. So far they seem to be taken "1 to 1" from the NXP
LSDK. This
pile of patches is totally unmanageable and it is impossible to
understand what
is really needed and what is not.
There was already a small discussion about this [3].
I would like to make a clear CUT here and work as far as possible with
the linux
upstream state.
What is your opinion about this?
(maybe any performance drawbacks, missing features etc.)
I am not a user of this target. I also do not like all these layerscape
patches and would support following upstream with only very few patches.
Doing the cut with the kernel 5.10 update is a good idea.
Hauke
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