[U-Boot] emmc access in pSLC mode

I couldn't find information about how to access emmc partitions, after switching to pSLC mode?
My previous commands like if ext4load mmc 0:1 ${addr_ld} /update give now ** Bad device size - mmc 0 **
Below the mmc info. The problem might be that user capacity=0, while I want to access GP1. But howto do so? Thanks a lot. - Arno
mmc info Device: sdhci@e0100000 Manufacturer ID: 13 OEM: 14e Name: Q1J54 Tran Speed: 52000000 Rd Block Len: 512 MMC version 5.0 High Capacity: Yes Capacity: 0 Bytes Bus Width: 4-bit Erase Group Size: 512 KiB HC WP Group Size: 8 MiB User Capacity: 0 Bytes WRREL Boot Capacity: 2 MiB ENH RPMB Capacity: 512 KiB ENH GP1 Capacity: 1.8 GiB ENH WRREL
mmc read 0 0 1 MMC read: dev # 0, block # 0, count 1 ... MMC: block number 0x1 exceeds max(0x0) 0 blocks read: ERROR
mmc dev 0 0 MMC: block number 0x1 exceeds max(0x0) switch to partitions #0, OK mmc0(part 0) is current device
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Arno