[U-Boot-Users] uboot basics ?

[Wolfgang Denk]

In message <8bf24776050830223673cd6b8e at mail.gmail.com> you wrote:
>
> How does a boot loader know which device is connected. say i have connected>  

U-Boot is stupid. It doesn't "know" anything. It just does  what  you
tell it.

> the smc 91111 ethernet 
> controller - how does it know it is smc91111 controller.

It doesn't know. It juist runs the code you configure into it.

> I think as soon as it detects the smc91111 controller is connected. it must>  

It doesn;t detect it. It just runs the init code if you configure it.

> What will happen if there are 2 ethernet controllers in the board. how 
> u-boot responds to this.

If just does what you configure...

> Does anybody know what constitues configuring a ethernet controller and wha> t 
> the code does ?.

I'd say such a question is off topic here. You are supposed to have a
deep understanding of the hardware and driver code when digging  into
boot loader code.

> i would request you to kindly let me the flow in u-boot. from startup to 
> configuring ind. devices.

Just start at the reset entry point and follow the code. Ther eis  no
easy way to understand it all.

> Any description is available in this matter will be very useful. 

Read the README and the manual.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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