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