Identifying boot device (from MMC2 or MMC1)

We would like to use both MMC2 and MMC1 to boot from with MMC2 beign used for field upgrades, to enable to happen we need to correctly identify the boot device in xload so we can load uboot, then in the same fashion in uboot identify the boot device so that we can load the linux image from the correct device.

Using Uboot to inspect the memory at the location of the tracing data I get

4020ffb0: 00000001 8000a1dc 80009560 6d000000    ........`......m

4020ffc0: 40204880 00000003 ffffffff 0000ffff    .H @............ 

So current vector is 00000001 8000a1dc 

Cold reset vector is 6d000000 40204880 

Both of these are from the same boot run with power applied to the board so only one boot should have happened, values aquired using "md" in uboot.

The same results occur with an MMC2 boot

Any ideas,