On Fri, May 17, 2019 at 11:57:23PM +0300, Sam Eiderman wrote: > From: Liran Alon <liran.a...@oracle.com> > > Windows kernel extracts various BIOS information at boot-time. > The method it uses to extract SystemBiosDate is very hueristic. > It is done by nt!CmpGetBiosDate(). > > nt!CmpGetBiosDate() works by scanning all BIOS memory from 0xF0000 to > 0xFFFF5 (FSEG) in search for a string which is formatted like a date. > It then chooses the string which represents the most recent date, and > writes it to: > > HKLM/HARDWARE/DESCRIPTION/System SystemBiosDate > > This date should usually be BiosDate located at FSEG(0xFFF5).
FWIW, if you want to ensure a stable date is found, it's probably simpler to force a valid date string to be present in the f-segment. Something like: char win_bios_date[] VARFSEG = " 04/01/2014 "; As with my previous emails, I'd recommend using a hard-coded date (not a build date) - as this tends to improve reproducibility. -Kevin _______________________________________________ SeaBIOS mailing list -- seabios@seabios.org To unsubscribe send an email to seabios-le...@seabios.org
