Marek,
Linux has SDIO stack. vendor provides wifi driver with SDIO interface like PCI interview.
My redpine wifi chip based custom SDIO card be detected in 2.6.30 but not in 2.6.18.
Redpine reference SDIO card works well in 2.6.18.
Where should I take a look in SDIO stack that invoke probe function?
---henry