EFI loader doesn't handle md_preload (md_image) correct?

[Harry Schmalzbauer]

 Bezüglich Harry Schmalzbauer's Nachricht vom 16.05.2017 17:28 (localtime):
> Bezüglich Toomas Soome's Nachricht vom 16.05.2017 16:57 (localtime):
>>> On 16. mai 2017, at 17:55, Harry Schmalzbauer <freebsd at omnilan.de> wrote:
>>>
>>> Hello,
>>>
>>> unfortunately I had some trouble with my preferred MFS-root setups.
>>> It seems EFI loader doesn't handle type md_image correctly.
>>>
>>> If I load any md_image with loader invoked by gptboot or gptzfsboot,
>>> 'lsmod'
>>> shows "elf kernel", "elf obj module(s)" and "md_image".
>>>
>>> Using the same loader.conf, but EFI loader, the md_image-file is
>>> prompted and sems to be loaded, but not registered.  There's no md_image
>>> with 'lsmod', hence it's not astonsihing that kernel doesn't attach md0
>>> so booting fails since there's no rootfs.
>>>
>>> Any help highly appreciated, hope Toomas doesn't mind beeing initially CC'd.
>>>
>>> Thanks,
>>>
>>> -harry
>>
>> The first question is, how large is the md_image and what other modules are loaded?
> Thanks for your quick response.
>
> The images are 50-500MB uncompressed (provided by gzip compressed file).
> Small ammount of elf modules, 5, each ~50kB.

On the real HW, there's vmm and some more:
Id Refs Address             Size Name
 1   46 0xffffffff80200000   16M kernel
 2    1 0xffffffff8121d000   86K unionfs.ko
 3    1 0xffffffff81233000  3.1M zfs.ko
 4    2 0xffffffff81545000   51K opensolaris.ko
 5    7 0xffffffff81552000  279K usb.ko
 6    1 0xffffffff81598000   67K ukbd.ko
 7    1 0xffffffff815a9000   51K umass.ko
 8    1 0xffffffff815b6000   46K aesni.ko
 9    1 0xffffffff815c3000   54K uhci.ko
10    1 0xffffffff815d1000   65K ehci.ko
11    1 0xffffffff815e2000   15K cc_htcp.ko
12    1 0xffffffff815e6000  3.4M vmm.ko
13    1 0xffffffffa3a21000   12K ums.ko
14    1 0xffffffffa3a24000  9.1K uhid.ko

Providing md_image uncompressed doesn't change anything.

Will deploy a /usr separated rootfs, which is only ~100MB uncompressed
and see if that changes anything.
That's all I can provide, code is far beyond my knowledge...

-harry