alfred steele wrote:
Hi,
Looks like there is a huge performance issue with the sdhc hardware/software driver on the mx31
Actually I do not find any MX31 board in the mainline supporting MMC. However, drivers/mmmc/mxcmmc.c is suitable for both MX2 and MX3 processors.
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.
This is your code and I am afraid we cannot help you. And u-boot 1.0 belongs to prehistory. I can only suggest you to update to the actual u-boot (2010.06-rc3) and sets your target to use the mxcmmc driver, and reports us if you find problems.
Best regards, Stefano Babic