Re: Athlon Optimization Problem

From: Denis Vlasenko (vda@port.imtp.ilyichevsk.odessa.ua)
Date: Tue Feb 05 2002 - 07:56:20 EST

On 5 February 2002 01:22, Serguei Miridonov wrote:
> Just as followup... I was trying to find a minimum deviation
> from BIOS settigns to make Soyo Dragon Plus stable:
>
> In KT266A northbridge 1106:3099:
>
> Reg[0x75] = 0x07; // this was set to 0x01 by BIOS
> Reg[0x76] = 0x00; // this was 0x10
> Without this change I had filesystem corruptions during
> kernel compilation...

[MODEL]=VT8366 (KT266) Athlon NB
[VID]=1106:VIA
[DID]=3099:Host to PCI Bridge

[75:7]=Arbitration Mode 0=REQ-based 1=Frame-based
(75:6)=CPU Latency Timer read only
(75:5)=(same as above)
(75:4)=(same as above)
[75:3]=(Reserved)
[75:2]=PCI Master Bus Time-Out 000=Disable
[75:1]=001=1x32 PCICLKs 010=2x32 PCICLKs
[75:0]=011=3x32 PCICLKs ... 111=7x32 PCICLKs

Note: other doc I have (for KT266A) says 75.3 is used for PCI Master Bus
Time-Out too (thus max timeout is 1111 = 15x32 PCICLKs)

[76:7]=I/O Port 22 Enable
[76:6]=(Reserved)
[76:5]=Master Priority Rotation 0x=every PCI master grant
[76:4]=10=after every 2 PCI 11=after every 3 PCI
[76:3]=REQn# to REQ4# Mapping 00=REQ4# 01=REQ0#
[76:2]=10=REQ1# 11=REQ2#
[76:1]=(Reserved)
[76:0]=REQ4# Is High Priority 0=disable 1=enable

KT266A doc says:
76.5-4: Master Priority Rotation: 00 disable
        01 every PCI master grant
        10 every 2 PCI master grant
        11 every 3 PCI master grant 

--
vda
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This archive was generated by hypermail 2b29 : Thu Feb 07 2002 - 21:00:41 EST