Re: [PATCH] Add Amstrad Delta NAND support.

[David Vrabel]

Jonathan McDowell wrote:
> On Thu, May 18, 2006 at 06:57:28PM +0200, Jörn Engel wrote:
>> On Thu, 18 May 2006 17:09:41 +0100, Jonathan McDowell wrote:
>>> +	omap_writew(0, (OMAP_MPUIO_BASE + OMAP_MPUIO_IO_CNTL));
>>                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> Could that be done in a macro?
> 
> Is there any benefit to doing so?
> 
>>> +	udelay(0.04);
>> Floating point in the kernel?
> 
> Not quite. udelay is a macro on ARM so this ends up as an integer before
> it ever hits a function call. In an ideal world I'd use "ndelay(40);"
> but that would result in a delay of over 1µs as ARM doesn't have ndelay
> defined so we hit the generic fallback.

Use instead:

/* delay for at least 40 ns */
udelay(1);

Or better yet provide an ndelay implementation for ARM.

David Vrabel
-- 
David Vrabel, Design Engineer

Arcom, Clifton Road           Tel: +44 (0)1223 411200 ext. 3233
Cambridge CB1 7EA, UK         Web: http://www.arcom.com/
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