I have the prebuilt u-boot-sd-P1024RDB_SDCARD-git-r17.bin and tried copying it onto the SD card for booting it. I did the following: I created 3 partitions - 1 partition of 512MB in linux-swap format, 1 partition of 20MB in ext2 format and the remaining space of my 4GB SD card as ext3 format.
I also did the following:
Ran mkswap on /dev/mmcblk0p1
Ran mkfs.ext2fs on /dev/mmcblk0p2
Ran mkfs.ext3fs on /dev/mmcblk0p3
After which I copied the prebuilt u-boot binary on the ext2 format.
I also set the switch settings as given in the quick start guide for booting from SD/MMC.
Could you tell me where I am going wrong? Or should I do something in addition to this?