[U-Boot] [PATCH V2] console: Implement pre-console buffer

[Simon Glass]

Hi Wolfgang,

On Tue, Aug 30, 2011 at 12:52 PM, Wolfgang Denk <wd at denx.de> wrote:
> Dear Simon Glass,
>
> In message <CAPnjgZ1fXCCFDcwCWgZD7H-siVEV-H+Ks5TPeiT=nGS743fzcg at mail.gmail.com> you wrote:
>>
> ...
>> > +#define CIRC_BUF_IDX(idx) ((idx) % CONFIG_PRE_CON_BUF_SZ)
>>
>> The division here sticks in the craw, but unless we go with
>
> Does it?  Why?

Only because of the division. But as Mike mentions later, the compiler
will avoid it for powers of two. So all is well.

>
>> CONFIG_PRE_CON_BUF_SZ_LOG2 then I don't see an easy way around it, and
>> since this is serial output we can't honestly claim to worry much
>> about performance.
>
> Please see my previous posting
> (http://article.gmane.org/gmane.comp.boot-loaders.u-boot/106810)
>
> I don't think 3 additional addembler instructions really play a big
> role here.

Yes I saw it, thanks.

Regards,
Simon

>
> Best regards,
>
> Wolfgang Denk
>
> --
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