[coreboot] unsupported mb questions (amd fam10h)

[Roman Elshin]

Adding call soft_reset() just after rs780_htinit() in romstage.c allow
to go further, now it stops just before boot:
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ATA controller 1 at 3010/3020/0 (irq 0 dev 88)
ATA controller 2 at 3018/3024/0 (irq 0 dev 88)
Got ps2 nak (status=51)
ata1-0: ST3500410AS ATA-8 Hard-Disk (465 GiBytes)
Searching bootorder for: /pci at i0cf8/*@11/drive at 1/disk at 0
ebda moved from 9fc00 to 9f800
USB keyboard initialized
ehci_wait_td error - status=80000d42
Initialized USB HUB (1 ports used)
All threads complete.
Scan for option roms
Press F12 for boot menu.
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Why it may stop and why soft_reset() call may be needed there? 
If I try to enable internal vga bios the last message are:
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In CBFS, ROM address for PCI: 01:05.0 = ffc00778
PCI expansion ROM, signature 0xaa55, INIT size 0xf000, data ptr 0x01b0
PCI ROM image, vendor ID 1002, device ID 9715,
PCI ROM image, Class Code 030000, Code Type 00 
Copying VGA ROM Image from ffc00778 to 0xc0000, 0xf000 bytes 
Real mode stub @00000600: 867 bytes 
Calling Option ROM...  
... Option ROM returned.
Devices initialized 
Detected error on hypertransport link 
Unknown device path type: 0 

HT: Leftover static devices. Check your devicetree.cb
POST: 0x24

Unknown device path type: 149613058
Unknown device path type: 0 
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Is the problem in devicetree.cb and how create correct devicetree.cb ?