Greetings, That is best done in Linux when it is truly known that the LinuxBIOS boot image was entirely successful (or at least successful enough that you could flash a new image if necessary).
G'day, sjames On Fri, 21 Feb 2003, Terry B. Chen wrote: > I read the code in cmos_failover.inc > But I don��t understand that RTC_BOOT_BYTE bit 1 gets the value from bit 0, the >program clear bit 0 every time. But When to set the bit0 to 1, it will make the code >jump to normal image next time? > I search 0x70(cmos index) in all but I cant find when set bit 0 to 1? > > -----Original Message----- > From: steven james [mailto:[EMAIL PROTECTED]] > Sent: 2003��2��20�� 23:27 > To: Terry B. Chen > Cc: [EMAIL PROTECTED] > Subject: Re: how to choice fallback or normal image? > > Greetings, > > > Several conditions need to exist for the primary image to be used. The > code looks at the RTC register to check for indication of power failure > (either battery dead, or clear CMOS jumper set), then the CMOS checksum is > checked. If both tests show that CMOS is valid, then check the > RTC_BOOT_BYTE. First, bit 0 is moved to bit 1 and bit 0 is cleared. Then, > if bit 1 is set, call the primary (normal image), That is done so that if > the boot fails for some reason, it will choose the fallback image next > time. It is also possible to cause a fallback boot by setting the clear > CMOS jumper. > > The RTC_BOOT_BYTE is not included in the checksum since it will be changed > wi8th every boot. > > Note that on some boards, the CMOS checksum is skipped. > > G'day, > sjames > > > The RTC_BOOT_BYTE > > > On Thu, 20 Feb 2003, Terry B. Chen wrote: > > > Dear all: > > I was puzzled by the fallback and normal image in s2722 > > (e7500), I am sorry to ask so simple question. When shall we use the > > fallback image and when shall we use the normal image? How you control > > which to run? > > The register DRC (7c) bit 29(Init complete) seem not to be set > > after memory initialization complete. am I right? > > Thank you! > > > > -- -------------------------steven james, director of research, linux labs ... ........ ..... .... 230 peachtree st nw ste 701 the original linux labs atlanta.ga.us 30303 -since 1995 http://www.linuxlabs.com office 404.577.7747 fax 404.577.7743 ----------------------------------------------------------------------- _______________________________________________ Linuxbios mailing list [EMAIL PROTECTED] http://www.clustermatic.org/mailman/listinfo/linuxbios
