[coreboot] boot hard disk image in Simnow

[WANG Siyuan]

Hi, all
I am trying to boot a hard disk image on SimNow. I use Parmer to test.
There are some errors on Seabios stage:
AHCI/0: probing
AHCI/0: link up
WARNING - Timeout at ahci_port_setup:470!
AHCI/0: device not ready (tf 0x7f)

On the real machine, this part is:
AHCI/0: send cmd ...
AHCI/0: ... intbits 0x2, status 0x58 ...
AHCI/0: ... finished, status 0x58, OK

The attachments are entire logs:
parmer.log is log on real machine
parmer_simnow.log is log on Simnow

Do you have ever worked on Simnow? Would you please give some suggestions?
Thank you!