Re: Porting to Marvell 88F5182?

[Rogan Dawes <rogan@dawes.za.net>]

On 2010/07/31 2:36 PM, Eric Bénard wrote:
> Hi Rogan,
>
> Le 31/07/2010 13:21, Rogan Dawes a écrit :
>> Since I'd be chainloading barebox from the existing U-Boot, which does
>> support loadb and bootm, it probably makes the most sense initially to
>> just skip the lowlevel init, and build a minimal ARM second stage, and
>> wrap it in a u-boot image, I think.
>>
>> I tried using the at91sam9263ek_defconfig, and unsetting
>> CONFIG_MACH_DO_LOWLEVEL_INIT.
>
> that won't work : you don't have the same memory mapping so barebox has
> little chance to be in ram on your platform and, even if it was in RAM
> as soon as it will poll for the serial port tx empty bit, you will stay
> blocked because your serial port is not the same as the at91sam9263.
>
> Eric

Hi Eric,

Ok, that makes sense, I guess. So the bare minimum I absolutely have to 
do is set up the serial port.

But won't the second stage loader simply use the existing memory map? I 
suppose I could tell it what it actually is, if it can't figure it out. 
I'm a little surprised it doesn't "just work", because I am currently 
booting using an old U-boot, chaining to a newly compiled U-Boot, and it 
"just works" (apart from the flash).

Regards,

Rogan

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