linux-kernel - Re: [PATCH 02/12] Blackfin arch: Add label to call new GPIO API

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Message-Id: <200708171415.33805.david-b@pacbell.net>
Date:	Fri, 17 Aug 2007 14:15:33 -0700
From:	David Brownell <david-b@...bell.net>
To:	"Mike Frysinger" <vapier.adi@...il.com>
Cc:	"Bryan Wu" <bryan.wu@...log.com>, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	"Michael Hennerich" <michael.hennerich@...log.com>
Subject: Re: [PATCH 02/12] Blackfin arch: Add label to call new GPIO API

On Friday 17 August 2007, Mike Frysinger wrote:

> as Michael pointed out, in the Blackfin world we tend to keep things
> very dynamic as we have dev systems which allow for dropping in of
> optional cards at will, so doing this in the bootloader is way too
> inflexible.

That's the tradeoff:  optimize for development boards, or
instead for more fixed-function product boards.


> oh, and another [smallish] data point.  the Blackfin processor has a
> small bootrom on it that could be likened to a very micro bios.  so
> it's possible to actually boot the linux kernel straight without a
> boot loader.  send the kernel over the UART to a Blackfin and watch it
> go go go :)

That's not uncommon, although I'm more used to seeing the
on-chip ROMs relying on a second stage loader for stuff like
getting memory and other clocks going at optimal speeds,
and loading "big" images (that won't fit on-chip SRAM).

- Dave

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