Asus A7V600-X mobo won't let me edit HDD boot sequence

I've got Asus A7V600-X mobo and two SATA HDDs, both bootable. I would like easy to choose from which one to boot-up.

BIOS doesn't "see" the HDDs so I can not edit the HDD boot sequence. (However, ATA devices are fully shown: DVDRW - Pioneer, CDROM - LG. Instead of my HDD SATA drives only stands "Onboard serial ATA device".)

After the BIOS screen VIA CONTROLLER shows my HDDs for the first time.

If I press ESC, then F1 during boot-up -- I can choose the boot sequence (exactly as it was in BIOS), but still I don't see my HDDs, only DVDRW, CDROM and "Onboard serial ATA device". F8 doesn't work.

So whatever I do, PC will boot the HDD connected to the first ("disk0" ) SATA port on Asus mobo.

If I want to boot from the other HDD, I must manually switch the SATA cables on the mobo! Sounds like stone age, huh? What can I do?