Dear Fleming Andy-AFLEMING,
In message <d4848e4b-3c47-4d5c-a171-a69439660...@freescale.com> you wrote:
>
> > Does this not depend on the units used for speed, and thus in the end
> > on CONFIC_SYS_HZ ?
>
> No, but that wasn't apparent because I didn't mention the units of
> 2^(13+timeout). It is in units of sd clocks.
>
> So: num sd clocks = (sd clocks per sec) * 0.25 sec =
> mmc->tran_speed/4 = 2^(13+regval).
>
> Now, it is true that the actual speed of the sd clock is going to
> depend on CONFIG_SYS_HZ, in that a tran_speed of 25MHz may not be
> perfectly achievable with available dividers, but this code is not
> taking that into account, and the fact that it's rounding up to the
> next power of two should take care of that.
Fine. Can we please add such explanation to the code?
Thanks.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
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