Thank you for the reply.
I undid the changes made by the 3 patches mentioned in r47045, and everything works perfectly now.
Can I blacklist the kmod-mmc-spi and kmod-mmc so that they do not load during boot?
I do not see the point in this, because, the conflict is with the ath79-spi driver.
It is really weird that the mod still works on Chaos Calmer after booting, but just not during the boot process.
If I remove the card while booting, the device boots succesfully.
Then I do
This leads to the card being successfully detected and I was even able to write and read a test file.
I'm unable to figure out what makes the difference during boot and not after boot.
Thanks again for your Deep MMC Hack!