[U-Boot-Users] [PATCH] ARM: add support of CONFIG_LAST_STAGE_INIT for arm
Wolfgang Denk
wd at denx.de
Tue Dec 11 23:03:16 CET 2007
In message <200712111205.48970.vapier at gentoo.org> you wrote:
>
> > Please keep in mind that U-Boot shall initialize hardware if and only
> > if it is using it (and that it must deactivate it after use).
>
> with many pieces of hardware, you can draw a line between initializing it and
> actually enabling/using it.
Correct. If make such a difference, then initialization shall be
performed when you enable it for the very first time in U-Boot.
There is many reasons for such a design; for example, think about the
system boot time.
> for example, shouldnt the initialization/programming of the MAC address always
> happen regardless of the network being used ? not all MAC's have/support
Not, it should not. It must not.
> eeprom's which contain the MAC address, so the implicit address programming
> that happens in hardware cannot happen.
The MAC is not needed before you access the Ethernet port, so ther
eis no need to do it before - or to ever do it, if you don't use the
network in U-Boot.
Please see also the FAQ.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
My play was a complete success. The audience was a failure.
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