[U-Boot] Supporting SCCB protocol

[John Tobias]

Thanks for chatting.

Regards,

john

On Mon, Jun 6, 2011 at 3:26 PM, Wolfgang Denk <wd at denx.de> wrote:

> Dear John Tobias,
>
> In message <BANLkTinn5oA711EuOELQeNRk2uYQ1N4+nw at mail.gmail.com> you wrote:
> >
> > I am going to use the OTP register to put a unique ID of the board. In
> order
> > to do that, I don't have to boot the OS if I need to read/write the
> unique
> > ID of the board.
> ...
> > On Mon, Jun 6, 2011 at 2:12 PM, Wolfgang Denk <wd at denx.de> wrote:
> ...
> > > Could you please explain why this cannot be done in the OS driver
> > > initialization code as well?
>
> Well, this is obviously nowhere needed for U-Boot operation, and you
> also don't need this in U-Boot to boot your OS.
>
> See bullet # 2 at
> http://www.denx.de/wiki/view/U-Boot/DesignPrinciples#2_Keep_it_Fast :
> We don't initialize things in U-Boot, that are not needed here, unless
> there is a very good reason for it.
>
> In your case, such initialization should be done in the OS device
> driver.  Leave it out of U-Boot.
>
> Best regards,
>
> Wolfgang Denk
>
> --
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
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>