Belxjander wrote:What is the latest for getting a dual-boot sam440 happening?
The 440, which is UBoot based, uses either SLB as standard, or Parthenope (ub2lb) as bootloader. SLB locates and creates a boot menu from one Kicklayout and supports Linux with an A1 config file stored on an Ext2/3 volume that also holds menu entries. Parthenope works similar but supports a more configurable GRUB like Linux config file.
Do you wish to dual boot only OS4 volumes or also Linux?
Is there any option for chainloading or providing modules for amigaboot or however uboot "boota" works to access filesystems using modules for bootstrapping?
There is in a way. From the Kicklayout you can add multiple entries and specify boot device to build up a custom list of boot entries. You can also set up soft links to different Kickstarts so that a kernel update will automatically update the kernel modules. With the Kicklayout pointing to those modules. I can dig up the info on this if you like.
But it sounds like you want greater control. You could write your own SLB or modify Parthenope to do this. Or indeed write your own Kickstart module to do it.
But what is it you need to achieve by this chain loading? Beyond being able to set up different systems to boot via menu.