[coreboot] Leafhill / Apollolake : S3 resume failed

Hi all,

any body tested out  suspend/resume functionality on any of Apollolake based board  and found working ?

On Leafhill board ( with HAVE_ACPI_RESUME is selected in  mainboard Kconfig ) , suspend works fine  and 'previous sleep state' reads correctly but in resume path boot hangs in romstage ( FSP-M init ) for while and board reboots (behaves as warm boot )

S3 suspend/resume with Fsp from github works fine on other Boot loaders like UEFI & Slim Boot loader.

please anyone can suggest me do i need enable extra config's in mainboard  or is it know issue ?