Dear Kumar Gala, In message <1298537614-20797-1-git-send-email-ga...@kernel.crashing.org> you wrote: > > - Timeout counter value is set as DTOCV bits in SYSCTL register > For counter value set as x, > Timeout period = (2^(13+x))/SD_CLOCK > > - As per 4.6.2.2 section of SD Card specification v2.00, host should > cofigure timeout period value to minimum 250 msec. > > - SD_CLOCK = mmc->trans_speed > > - Calculating x based on > 250 msec = (2^(13+x))/mmc->trans_speed
OK, here the theory is given... > + /* Timeout period = (2^(13+timeout))/mmc->trans_speed > + * Timeout period should be minimum 250msec as per SD Card spec > + */ > + timeout = fls(mmc->tran_speed/4); > timeout -= 13; But how does this translate intothis formula? I think there must be missing something. Also, should there not be some checking for valid input data ranges? Nitpick: incorrect multi-line comment style. 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 "There's always been Tower of Babel sort of bickering inside Unix, but this is the most extreme form ever. This means at least several years of confusion." - Bill Gates, founder and chairman of Microsoft, about the Open Systems Foundation _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
