[Gumstix-users] How do you access MMC driver set_ios?

[Larry M. <Larry@GlueLogix.com>]

What is the accepted method for getting to the mmc_set_ios() method?

I want to lower the Verdex Pro MMC clock by passing in a nonstandard 
clock rate.  The pxamci driver refreshes the CLKRT register from the 
stored value on each pxamci_start_cmd(), which chains from 
mmc_start_request().  It looks like you have to compute your desired 
clock rate by dividing the max clock by a power of two between 0 and 6. 
  You then pass that value in to mmc_set_ios(), using an mmc_ios 
structure, and let pxamci_set_ios() reverse the computation.  The end 
result is a three bit number in CLKRT.

I have looked for a command line interface in /proc and /sys with no 
success.  I am currently looking at modprobe with parameters and 
eventually a C program, but would be very grateful if someone would 
share a command line access method.

Thanks,
Larry Martin
www.GlueLogix.com

Related Posts:
http://old.nabble.com/slowing-down-MMC-clock-on-Verdex-Pro--to29765291.html#a29765291
http://old.nabble.com/Sporadic-SD---MMC-failure-to28603343.html