video and usb driver (rk3588)

[Norman Feske]

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! :)

Cheers
Norman

-- 
Dr.-Ing. Norman Feske
Genode Labs

https://www.genode-labs.com · https://genode.org

Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth