[U-Boot] AM3703 does not boot from MicroSD card

Hi I'm trying to upgrade u-boot from 2016.03 to 2017.09. When I boot it up, u-boot gives me this error. What could be the problem? Thanks.
U-Boot SPL 2017.09-dirty (Jan 29 2018 - 10:56:46) Trying to boot from MMC1 MMC Device 0 not found spl: could not find mmc device. error: -19 SPL: failed to boot from all boot devices ### ERROR ### Please RESET the board ###
-- Sent from: http://u-boot.10912.n7.nabble.com/

On Tue, Jan 30, 2018 at 1:54 AM, phantom0 sicong.jia@gumstix.com wrote:
Hi I'm trying to upgrade u-boot from 2016.03 to 2017.09. When I boot it up,
I vaguely remember something similar to this with some similar device, any reason you can't just got to 2018.01?
u-boot gives me this error. What could be the problem? Thanks.
U-Boot SPL 2017.09-dirty (Jan 29 2018 - 10:56:46) Trying to boot from MMC1 MMC Device 0 not found spl: could not find mmc device. error: -19 SPL: failed to boot from all boot devices ### ERROR ### Please RESET the board ###
-- Sent from: http://u-boot.10912.n7.nabble.com/ _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
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Peter Robinson
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phantom0