[U-Boot-Users] U-boot and Mathematical Library

[U-Boot-Users] U-boot and Mathematical Library

[Vincenzo Scianni]

Hi to everyone.

I have a general question: my need is to use u-boot to initialize a PowerPC 5123 and then to continue with a custom kernel without Linux. The problem is that during initialization I must drive very early a graphical controller by PCI to show some logos and I need of mathematical library; I suspect that u-boot doesn't support any. First question there exist one compatible with u-boot ? In your opinion is it possible to follow idea of import a mathematical library to boot and draw something and after continue with a custom kernel ? There is some deep technical reason to load a Linux kernel and then plot a logo ? 

Thanks and best regards.
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[U-Boot-Users] U-boot and Mathematical Library

[Albert ARIBAUD]

Vincenzo Scianni a ?crit :
> Hi to everyone.
>  
> I have a general question: my need is to use u-boot to initialize a 
> PowerPC 5123 and then to continue with a custom kernel without Linux. 
> The problem is that during initialization I must drive very early a 
> graphical controller by PCI to show some logos and I need of 
> mathematical library; 

What kind of logo display requires math? You're going to display a 
bitmap probably, so the only math involved would be integer arithmetic, 
I think. And if you have a logo in vector form, then you can convert it 
to bitmap (adapted to your FB format) offline and link the bitmap from, 
not the vector, in u-boot.

> I suspect that u-boot doesn't support any.

I suspect you're right.

> First question there exist one compatible with u-boot ?

Don't know.

> In your opinion  is it possible to follow idea of import a mathematical
 > library to boot and draw something and after continue with a custom
 > kernel ?

No reason why you could not; but I think that's a waste of FLASH and 
cycles, and you'd be better of turning your logo into a simple bitmap 
format that u-boot possibly already understands.

> There is some 
> deep technical reason to load a Linux kernel and then plot a logo ?

No reason for this, but again, no reason (that I can see from your 
description) that you'd need math in the first place. Can you elaborate 
on the reason that makes you need math onboard rather than off-board?

Amicalement,
-- 
Albert.

[U-Boot-Users] U-boot and Mathematical Library

[Detlev Zundel]

Hi,

> Vincenzo Scianni a ?crit :
>> Hi to everyone.
>>  
>> I have a general question: my need is to use u-boot to initialize a 
>> PowerPC 5123 and then to continue with a custom kernel without Linux. 
>> The problem is that during initialization I must drive very early a 
>> graphical controller by PCI to show some logos and I need of 
>> mathematical library; 
>
> What kind of logo display requires math? You're going to display a 
> bitmap probably, so the only math involved would be integer arithmetic, 
> I think. And if you have a logo in vector form, then you can convert it 
> to bitmap (adapted to your FB format) offline and link the bitmap from, 
> not the vector, in u-boot.

Check the splashscreen support already in place (CONFIG_CMD_BMP).  It
supports BMPs.

Cheers
  Detlev

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