Re: O2 framebuffer problems with install kernel

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Hello,

On Jul 28, 2008, at 12:20, Jorge Acereda Maciá wrote:

> On Jul 28, 2008, at 5:26 PM, Michael Lorenz wrote:
>>
>> Not really - as I said, unaligned writes there are silently  
>> ignored, unaligned reads just work so you wouldn't get an error  
>> either way, just malfunctioning drivers.
>> The other driver that might get bitten by this is mec ( the O2's  
>> onboard ethernet ) but I don't know if it uses any bits that would  
>> be affected, IIRC most of its registers are 32bit aligned to 64bit.
>
> mec works properly.

Ok.

>> To test this please do this:
>> Look at crmfb_attach(). After mapping the drawing engine's  
>> registers (         rv = bus_space_map(sc->sc_iot, 0x15000000,  
>> 0x6000, 0, &sc->sc_reh);
>>  ) write some random but recognizeable value into one of the  
>> drawing engine's TLB registers ( like this: bus_space_write_8(sc- 
>> >sc_iot, sc->sc_reh, CRIME_RE_TLB_A, 0x1122334455667788L); ) and  
>> read it back a little bit later. If you get the same value you  
>> wrote you're fine and I'll have to think of a new way to screw  
>> things up, but if you get something like 0x1122334400000000 or  
>> some random garbage in the lower 32 bit then that's the problem.
>> If you do this right after mapping the registers it should run  
>> even on a serial console, the code that checks for firmware setup  
>> come later.
>
> Done, it reads back the same value.

Good, so it's something else and apparently Izumi Tsutsui already  
found a fix ( did you get his mail containing the patch? I didn't, if  
you got it please mail it to me privately )

have fun
Michael

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