SD 4-bit mode

Hi

why are u-boot and linux accessing SD card in 1-bit mode on zedboard? I see no reason for this? The card is connected in 4-bit compatible mode, and all applications and software should talk in 4-bit mode for best performance.

0 Former Member over 12 years ago

trioflex,

When the zedboard was launched Xilinx was on 14.1 of their tools. Today they are on 2012.3 (14.3). After reviewing the git repo for uboot it doesn't look like the support existed for x4 up until this release.

I am more than halfway done with a how-to for compiling, and packaging the newer version of uboot for the Zedboard. I should have it published by tomorrow afternoon.
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0 Former Member over 11 years ago

As per as in u-boot....

clone the latest u-boot from xilinx git.
http://git.xilinx.com/?p=u-boot-xlnx.git;a=summary

We can able to detect and program through 4-bit mode as well.

-Jagan.
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