When trying to install FreeBSD 6.2 on a 2 GB compact flash card, the following error appeared:

It seems that big compact flash cards have some problems and you have to disable DMA in order to use them. Here is how you do it:

1. At the installation CD's loader prompt, choose Escape to loader prompt.
2. Enter
   
   set hw.ata.ata_dma=0
3. And boot the kernel with this variable set, enter:
   
   boot
4. Install FreeBSD
5. Restart with the same trick as in step 2, now from the flash card.
6. Once booted, add the following line in /boot/loader.conf:
   
   hw.ata.ata_dma=0
7. The flash card should be usable now without human intervention.

That should make the flash card work correctly.