Genode on RK3588 and Emulation

[Michael Grunditz]

In message <Y1kBF4LltIgWpXGj at genode-labs.com>
          Stefan Kalkowski <stefan.kalkowski at genode-labs.com> wrote:



> I do not know in which mode your platform is started. From your
> writings, I did assumed it starts in EL2. If I remember correctly,
> apart from UART accesses, the first "register" access should be the
> EL2 MMU setup right before the assembler snippet switches to EL1.

EL2 is where uboot leaves me.

>> 
>> I am also thinking of uboot.  I have no control over it as it is now. It
>> promptly refuses uimages,  gives abort. I am loading binary to load/start
>> address and start it with go.
>> 
>> Bootm command does a bit more than just jumping to a address.
>> 
>> I need to build uboot, but in order to boot from mmc I need to nuke boot
>> sector on emmc.
>> 
>> A good thing is that I have the TRM's now.

> To me this seems to be the root cause for the symptoms you are
> experiencing. When the image is somehow corrupted resp. not setup
> completely (e.g. non-zeroed data segment parts), you'll get strange
> results in the execution of the bootstrap code.
> Therefore, it would be good to first target the issues that lead to
> the uImage load failure. Normally, you do not necessarily need to
> build u-boot on your own. Maybe you can investigate what holds u-boot
> from loading your uImage successfully (trying different linking
> address, different loadaddr for the uImage etc.).

> Regards
> Stefan

Makes sense. I have tried many load linking addresses. They all fail in 
the same way. It fails before "Starting kernel..."

 We are moving to a new place here so it will not be done right now. Board 
and similar stuff makes it ways into boxes.

I have tried to use different banks of ram. Linux lists four areas. If I 
go with the second I get data abort at the place bootstrap code hangs. Not 
a very useful ESR , but the cpu is reading. PC,LR and SP points to 
addresses in uboot. I don't think alignment is a problem here. But it can 
be uboot. If interrupts are on it can make things corrupt pretty quick. 
But before it starts mapping elf segment it maps the beginning of image 
with success.

So new uboot is the first thing I will do when things are settled here.



-- 
Best regards,
Michael Grunditz

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