I got the device to recognize the SD card by building manual on a Linux system.
It now works with no need of additional installations of other packages. All through added some packages in the make configmenu and I don't exactly know which one is responsible for this nice behavour because there are many possibilities.
It seams that the official config does not have any spi packages installed that may break te usage of the SPI based SD cardreader, but the mmc packages are maybe related as well...
Can somebody determine the packages that are not responsible for SD Card recognicion and I/O, so i can make only one or two new builds to determine the exact package.
I think it would make sense to insert the related package in the official build as soon as I find it.
This is the my conifg.seed
This is the official config.seed
maybe its one of those:
CONFIG_PACKAGE_kmod-mmc=y
CONFIG_PACKAGE_kmod-mmc-spi=y
CONFIG_PACKAGE_kmod-sdhci=y
CONFIG_PACKAGE_kmod-sdhci-mt7620=y
CONFIG_PACKAGE_kmod-spi-bitbang=y
CONFIG_PACKAGE_kmod-spi-dev=y
CONFIG_PACKAGE_kmod-spi-gpio=y
CONFIG_PACKAGE_kmod-spi-gpio-custom=y
CONFIG_PACKAGE_libdbus=y
CONFIG_PACKAGE_libstdcpp=y