How to add three linux image in EMMC

[XianluoCat]

I want to put three same image in emmc, and then choose to boot one of them from HSS(we don't have usbdmsc interface on our board), I have tried to trans the image to DDR, and use the mmc write cmd put the image to MMC, it work ok.
I make a image size 0xC909000 to DDR 0x8a000000 , and I use cmd: "mmc dev 0" ; "mmc write 8a000000 0 64848"; use "mmc part" cmd it shows 3 partitions, then I use cmd: "mmc write 8a000000 80000 64848";try to put the image on another location。but "mmc part" also show 3 partitions. it work ok ? if not , how can I resolve this problem？