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Date: Thu, 26 Dec 2013 08:58:30 +0800
From: Li Guang <lig.fnst@cn.fujitsu.com>
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Subject: Re: [Qemu-devel] [PATCH] allwinner-a10: add config script support
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Peter Crosthwaite <peter.crosthwaite@xilinx.com>, QEMU Developers <qemu-devel@nongnu.org>

Peter Maydell wrote:
> On 26 December 2013 00:39, Li Guang<lig.fnst@cn.fujitsu.com>  wrote:
>    
>> Peter Maydell wrote:
>>      
>>> On 26 December 2013 00:14, Li Guang<lig.fnst@cn.fujitsu.com>   wrote:
>>>        
>>>> it's the approach sunxi-linux kernel config hardware,
>>>> the binary is actually a transformed text script,
>>>> and context of script is like:
>>>>
>>>> [card0_boot_para]
>>>> card_ctrl = 0
>>>> card_high_speed = 1
>>>> card_line = 4
>>>> sdc_d1 = port:PF00<2><1><default><default>
>>>> sdc_d0 = port:PF01<2><1><default><default>
>>>> sdc_clk = port:PF02<2><1><default><default>
>>>> sdc_cmd = port:PF03<2><1><default><default>
>>>> sdc_d3 = port:PF04<2><1><default><default>
>>>> sdc_d2 = port:PF05<2><1><default><default>
>>>>
>>>>          
>>> So what sets this up on real hardware? Is this part of
>>> a firmware blob? Is it in ROM or flash?
>>>        
>    
>> it's generally in /boot, bootloader will load it
>> into ram address 0x43000000, kernel will find it
>> at this fixed address, and parse it, learn the hardware
>> related configuration, mostly property of devices, and
>> GPIOes used.
>>      
> Weird. Why isn't this just using devicetree?
>    

don't know the exactly reason linux-sunxi community
do this(actually, the script parsing code mostly wrote
by engineer from Allwinner).

> I'd rather not have to add support to QEMU's bootloader
> for weird things like this if I can avoid it...
>
> Who provides this file? The board manufacturer?
> Where's the source? How do you create the blob?
> What license are the sources under?
>
>    

the file will vary for different board,
we can created by our-self,
just write the formatted text script, and
transform it to binary by a tool,
refer to:
http://linux-sunxi.org/Sunxi-tools

Thanks!