From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wolfgang Denk <wd@denx.de>
Date: Mon, 21 Apr 2008 12:07:49 +0200
Subject: [U-Boot-Users] [PATCH] Blackfin: implement go/boote wrappers
In-Reply-To: Your message of "Mon, 21 Apr 2008 05:41:40 EDT."
	<200804210541.41085.vapier@gentoo.org>
Message-ID: <20080421100749.377CD247AF@gemini.denx.de>
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To: u-boot@lists.denx.de

In message <200804210541.41085.vapier@gentoo.org> you wrote:
>
> > This makes no sense. If it is ``exactly like "go"'' it doesn't matter
> > if the code returns or not (and actually this is what I'm  trying  to
> > point out all the time).
> 
> the obvious implication is that i would add the cache disabling hooks to the 
> jump command instead of the go command since you wont allow the hook around 
> go.

So it would NOT be ``exactly like "go"''.

Providing both a "go" and a "jump" command which differ just in cahce
handling seems broken to me. If you want to add such a feature,  then
I recommend to do it as part of "go", but make it optional, i. e. in-
troduce a new optional argument to the "go" command, something like

	go [ -cache={off,d-off,i-off,on,d-on,i-on} ] addr [ args ... ]

> > It's just that "go" shall retain the standard U-Boot environment for
> > application it runs, and that the applications need to take care if
> > they need to meddle with interrupts, exception handlers, etc.
> 
> U-Boot sets up no interrupts and the only exceptions that occur on the 
> Blackfin are for cache handling.  disabling the caches forces a sane 

There is more procvessors in  this  world  than  just  Blackfin,  and
others  *do*  enable  interrupts,  etc.  It  is  important to me that
implementations behave the same no matter which architecture you  are
using.


Best regards,

Wolfgang Denk

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DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
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