You are correct... We have no battery backup on our custom carrier board. Bill
-----Original Message----- From: Michael Karcher [mailto:[email protected]] Sent: Thursday, April 08, 2010 12:44 AM To: Carl-Daniel Hailfinger Cc: Bill Flanders (wtflanders); [email protected] Subject: Re: [flashrom] JIDA CMOS Am Donnerstag, den 08.04.2010, 04:20 +0200 schrieb Carl-Daniel Hailfinger: > > I ran into the same problem when I automated flashing the BIOS followed > > by running nvramtool to set the CMOS values. > > The settings do not hold if you power down the system, however, they do > > hold when you reboot the system via the "reboot" command. > So unless I'm misunderstanding you, the BIOS performs some "magic" on a > warm reboot which causes the effect of nvramtool to become permanent. As I understand it, the system is equipped with two storage system for the BIOS parameters: The CMOS RAM/"RTC" and an "EEPROM" (which is why you need to run jidacmos twice - one for rtc, once for eep). My guess would be that this eeprom is a i2c eeprom that contains a copy of the rtc parameters. The CMOS RAM seems to be powered down/lose settings on powering down the system (i.e. no battery backup), so parameters are restored from the EEPROM on next power-on. Regards, Michael Karcher _______________________________________________ flashrom mailing list [email protected] http://www.flashrom.org/mailman/listinfo/flashrom
