Hi,

Looks like there is a huge performance issue with the sdhc hardware/software driver on the mx31 Earlier on i had adapated the freescale mx "sdhc driver" and ported it to the mx31 platform for U-boot v1.0. I have modified the driver to put the host as well as the card in 4 bit mode in the initialization sequence. Inspite of that doing a "fatload" for a file of size of the order of 16MB takes about 10 minutes, which is nowhere near the theoretical speed even in 1 bit mode. I have seen the scope trace(s) and looks like multiple Data pins are being used for data, but seems like it takes forever, Could anyone give me quick clues as to what could be the issue? I haven't done any measure on the linux side yet using "dd".

Thanks in advance, Alfred