My understanding is that when a device appears as 'umass', support for large cards and/or SDHC is entirely at the mercy of the reader chipset 'behind' the USB interface that hides it from the host.
For the Thinkpad, it looks like the card reader is detected as an actual SDHC device (sdhc0 at pci6 dev 0 function 2 "Ricoh 5C822 SD/MMC"), so support for larger cards might require specific support in the OpenBSD driver? My new work laptop has a similar Ricoh reader, so I am interested in the outcome of this question. Kevin
