I think your syntax is wrong, have you tried to use the UUID or LABEL, like the FAQ.
You can now specify the device to be used by UUID as follows:
tce=UUID=4773-DFE2 home=UUID=4773-DFE2 opt=UUID=4773-DFE2 restore=UUID=4773-DFE2
For Tiny Core boot options use:
tce=LABEL=tinycore home=LABEL=tinycore opt=LABEL=tinycore restore=LABEL=tinycore
http://tinycorelinux.net/faq.html