K8 + 2.4.21 + SuSE 64-bit mode + Arima HDAMA + 49LF040 + MTD

Eric W. Biederman ebiederman at lnxi.com
Sat Jun 28 12:06:01 CEST 2003

YhLu <YhLu at tyan.com> writes:

> Eric,
> I have some questions about the APIC.
> How can I change the Second Opteron's  APIC_ID? DO I need to make the second
> CPU run and its process access (APIC_DEFAULT_BASE+APIC_ID) and set (1<<24)
> to it.

You need to know the apic id before you can start code on the second
cpu.  I recall seeing how how this is set in the BIOS programmers guide.
Look under unit id.

> Then When should start the process in auto.c or hardwaremain.c (
> startup_other_cpus function)?  I have tried to add one branch in auto.c and
> seems the second cpu start only from crt0.base. and it try copy LinBIOS and
> Jump

You definitely want to use the code in startup_other_cpus.
There is no good reason to run to multiple cpus in auto.c


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