EPIA Linuxbios strangeness
Steve Gehlbach
steve at nexpath.com
Sun Aug 17 15:57:01 CEST 2003
SONE Takeshi wrote:
> Setting bit 1 of ISA bridge register 4F does a system reset.
> I have these lines instead of /sbin/reboot in /etc/init.d/reboot
> (Debian system).
>
> sleep 1
> setpci -s 0:11.0 4f.b=9
>
From the datasheet:
Via VT8231 fn 0
Offset 4F –PCI Bus and CPU Interface Control ..........RW
----------------------------------------------------------
7-4 Reserved ................always reads 0
3 CPU Reset Source
0 Use CPURST as CPU Reset..default
1 Use INIT# as CPU Reset
2 Config Command Reg Rx04 Access (Test Only)
0 Normal:Bits 0-1=RO,Bit 3=RW...default
1 Test Mode:Bits 0-1=RW,Bit-3=RO
1 IRDY #Wait States
0 0 Wait States.............default
1 1 WaitState
0 Software PCI Reset ...write 1 to generate PCI reset
What about the ACPI I/O space (set same as Award BIOS, I think, 0x4000),
in particular 0x4002, 0x4003? Anyway this can be used?
-Steve
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