arasan-sdhci eMMC Problem 'command timeout'

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Hey, 

I have connected an eMMC to sdhci0 and a uSD Card to sdhci1 of a Zynq. 
while the uSD Card seams to work fine i'm getting the error

arasan-sdhci e0100000.mmc@xxxxxxxxxxx: registered as mmc0
arasan-sdhci e0100000.mmc@xxxxxxxxxxx: SDHCI_INT_ERROR: 0x00000001
arasan-sdhci e0100000.mmc@xxxxxxxxxxx: error while transfering data for command 8
arasan-sdhci e0100000.mmc@xxxxxxxxxxx: state = 0x01ff0001 , interrupt = 0x00018000
arasan-sdhci e0100000.mmc@xxxxxxxxxxx: SDHCI_INT_ERROR: 0x00000001
arasan-sdhci e0100000.mmc@xxxxxxxxxxx: error while transfering data for command 55
arasan-sdhci e0100000.mmc@xxxxxxxxxxx: state = 0x01ff0001 , interrupt = 0x00018000

from the eMMC. 

arasan-sdhci e0101000.mmc@xxxxxxxxxxx: registered as mmc1
mmc1: detected SD card version 2.0
mmc1: registered mmc1

both eMMC and SDCard work fine in Linux. So I think the Problem is some confuguration difference between Linux and barebox. 
The MMC is from type MTFC8G but Linux detects it as  

[    2.012122] mmc0: new high speed MMC card at address 0001
[    2.021129] mmcblk0: mmc0:0001 Q2J55L 7.09 GiB 
[    2.026355] Btrfs loaded, crc32c=crc32c-generic, zoned=no, fsverity=no
[    2.027458] mmcblk0boot0: mmc0:0001 Q2J55L 16.0 MiB 
[    2.031509] mmcblk0boot1: mmc0:0001 Q2J55L 16.0 MiB 
[    2.039829] mmcblk0rpmb: mmc0:0001 Q2J55L 4.00 MiB, chardev (245:0)

Unfortunattly I'm not very familliar with SDHCI, so I would apreciate any help. 

Best Regards 
Michael














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