SuperCard provides CF and SD to GBA adaptors, and offer support on their website at http://www.supercard.cn/.
All kinds of Supercards are supported by DSLinux. But the Supercard rumble, Supercard Rumble lite and Supercard DS(ONE) contain no extra RAM, and are therefore not recommended for use with DSLinux.
Running homebrew on the Supercard
Current versions of the supercard firmware run .nds files out of the box, do NOT use the Supercard PC software to patch homebrew files. Just follow the installation instructions for DSLinux and you are ready to go.
note: The latest firmware (1.84) has support for DLDI auto patching
Firmware updates
SuperCard seems to provide updates fairly regularly - so you may want to check back to see if there are updates. They also provide modified versions of moonshell, as well as other loaders.