Just for the record: i ALWAYS had reboot issues when enabling ramzswap device, regardless of disksize. Just uninstalled speedpatch and batterypatch (like freemangordon suggested multiple times), and tried again (propbably for the 10th time now). At least it created and initialized the device now. So now up to testing with freemangordon's proposed proc and sys values.

I used colin.stephane´s kernel packages btw, and moved swap to /dev/mmcblk1p2 (512MB size).

Remaining issue is that swapoff /dev/mmcblk0p3 takes ages and often returns the message "swapoff: /dev/mmcblk0p3: Cannot allocate memory".

Question: can we use memlimit_kb instead of disdksize_kb and provide /dev/mmcblk1p2 as backing swap, disabling swap on /dev/mmcblk0p3 as usual?