uBoot not working on SDHC card

I'm trying to boot my 4gb SDHC card via uboot however I don't see any sort
of output on the JTAG port.  I tried another card and the same thing
happened.  I tried a buddy's card and it worked fine.

I'd have a closer look at your buddy's card.  Is it a smaller card? A
higher class?  A different brand?

Which machine is this?  What are you looking at the JTAG port with?

His card is a Kingston 2gb.  I'm using an Adata 4GB SDHC.  We're using the
same exact board, and I'm using the same JTAG config on both.  I've seen
output in Putty, and GTKTerm, depending on the OS I'm in.

Ok, tried it on a standard SD card.  That worked.  Now it's down to getting
VGA to output.