linux-kernel - Re: [PATCH] dsp56k: use request

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Date:	Thu, 10 Jul 2008 09:53:39 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Fredrik Noring <noring@...rew.org>
Cc:	Jaswinder Singh <jaswinder@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	kernelnewbies <kernelnewbies@...linux.org>,
	kernel-janitors <kernel-janitors@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Lars Brinkhoff <lars@...rew.org>,
	Tomas Skäre <tomas@...rew.org>
Subject: Re: [PATCH] dsp56k: use request_firmware

On Thu, 2008-07-10 at 09:38 +0200, Fredrik Noring wrote:
> Hi David,
> 
> 9 jul 2008 kl. 15.05 skrev David Woodhouse:
> > It is in fact identical. Disassembly with the tools found on  
> > sourceforge
> > was fun, since they have endianness bugs, don't recognise the 'JMP'
> > which was the first instruction, and need each 3-byte instruction in  
> > the
> > binary to be prefixed with a zero byte to make it 4 bytes. But after
> > sorting that out and going through it instruction by instruction, it
> > really does seem to match.
> 
> Heh. Amazing.
> 
> [ I think the code can be simplified: It currently copies itself to a  
> high program memory location, but this is not necessary because DSP  
> soft reset was never implemented (the reset would have been trapped by  
> the code, in order to load a new program). The driver instead power- 
> cycles the DSP every time a new program is loaded. ]

I did wonder about that. But since we can't test, we're not going to
touch. Better to keep the assembler code which precisely matches the
known-good binary.

-- 
dwmw2

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