video and usb driver (rk3588)

[Michael Grunditz]

On Fri, 13 Jan 2023 at 12:05, Norman Feske <norman.feske at genode-labs.com> wrote:
>
> Hi again,
>
> >>>> Kernel: MMU-fault not handled ESR=0x92000061
> >>>> Kernel: init -> drivers -> gui_fb -> ep raised unhandled MMU fault
> >>>> ip=0x1009bb4 fault-addr=0x113d76ac type=unknown
>  >
> > [...]
> >
> >> Maybe the fault IP refers to some special (neon?) instruction with
> >> tighter constraints? Have you had a look at the faulting instruction?
> >>
> > Sorry , for being uneducated, but is "ip" an instruction (doesn't make
> > sense , isn't an opcode)
> > or is it an address? If address, where can I look it up?
>
> just noticed that I left your question unanswered.
>
> IP stands for "instruction pointer". It is printed in the page-fault
> message (in this case 'ip=0x1009bb4').
>
> When I see such an address, I'm usually using objdump to look up the
> code around it, using the debug version of binary. In this case:
>
>    build/arm_v8a$ genode-aarch64-objdump -lSd debug/gui_fb | less
>
> In less, I search for '1009bb4', where I can see both the source line
> numbers around the IP (scrolling back helps sometimes for heavily
> inlined code), and also the opcode of the instruction at the IP.
>
> However, if my guess of the previous posting is correct, the particular
> instruction is probably innocent.
>
> > Thanks , again. USB is currently a mess. I started from older imx8
> > driver which depends on u-boot to start. I use u-boot "usb start"
> > before boot.
> > But it works :-)
>
> Congratulations, it's a miracle! :)

Thanks I am happy! I have worked with this for 9 days and 9 nights
since the first serial output.
I will try to devise a platform driver .. I think I already did this (
but not right now, things got bad for unknown reasons , so reverted ).

Michael