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MMC error

Hi,

I am using AM335X in my design,but I got a mmc error when booting up.The booting logs as follow.

the difference of my HW with SK board is I use SPI0_CS0 to the sdCard's CD, and the SPI0_CS1 is used to

UART3_RXD to connect with GPS module.

If I disconnect UART3_RXD from GPS module, the booting is normal.

Maybe I should modify u-boot code,but What should I do with u-boot ?

Thank you very much.

OMAP SD/MMC: 0
reading u-boot.img
reading u-boot.img
mmc_send_cmd : timeout: No status update
mmc fail to send stop cmd
Error reading cluster
spl: error reading image u-boot.img, err - -1