533Mhz FSB of E7501

steven james pyro at linuxlabs.com
Thu Apr 10 09:13:01 CEST 2003


Greetings,

I'll have to do a bit of studying, but the one thing that jumps out at me
immediatly is bit 7 of register 0x8c. and 0x78-0x7b. The big difference
there is that DRAM timings are backed off a bit, and 0x8c selects for 133
(266) MHz operation.

There will likely be a bit of trial and error with differences to the RAM
configuration since there is no way to dump those settings out (unless
someone knows something I don't).

0xe8-9 and 0x80-3 are not documented by Intel. 0x80 appears to involve CAS
latency according to Eric (it certainly seems that way). That setting is
at line 189 of e7501/raminit.inc.

G'day,
sjames




On Thu, 10 Apr 2003, Terry B. Chen wrote:

> 	We tested s2723 that use E7501 source code; I find linuxbios can not support dual channel memory. Then I try to disable hyper threading, the spot_check meet error again£¡ 
> 	I have compare the E7501 with E7500 Bios spec, it have a lot of differences between these two chipsets including RCOMP programming. I suppose it need to modify in many site.
> 	This is the two the lspci file. I suppose you just need 00:00;0 
> 400 FSB:
> 	00:00.0 Host bridge: Intel Corp.: Unknown device 254c (rev 01)
> 00: 86 80 4c 25 06 01 90 00 01 00 00 06 00 00 00 00
> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 30: 00 00 00 00 40 00 00 00 00 00 00 00 00 00 00 00
> 40: 09 00 05 11 00 00 00 00 00 00 00 00 00 00 00 00
> 50: 04 60 0d 00 00 00 00 00 00 10 11 01 00 00 33 33
> 60: 00 00 08 08 08 08 08 08 00 00 00 00 00 00 00 00
> 70: 00 03 00 00 00 00 00 00 1f 04 01 39 79 02 67 20
> 80: b1 0b 71 00 00 00 00 00 00 98 10 d2 0d 00 00 00
> 90: 00 00 00 00 00 00 00 00 55 05 55 05 01 1a 38 00
> a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> c0: 44 c0 50 11 00 20 ff 03 00 00 00 00 00 00 00 00
> d0: 02 28 00 0e 03 00 00 33 80 09 31 b5 00 00 01 01
> e0: 1d 1d 00 00 00 00 00 00 56 46 00 00 00 00 00 00
> f0: 00 00 00 00 74 00 30 40 40 0f 00 00 00 00 00 00
> 533 MHZ:
> 00:00.0 Host bridge: Intel Corp.: Unknown device 254c (rev 01)
> 00: 86 80 4c 25 06 01 90 00 01 00 00 06 00 00 00 00
> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 30: 00 00 00 00 40 00 00 00 00 00 00 00 00 00 00 00
> 40: 09 00 05 11 00 00 00 00 00 00 00 00 00 00 00 00
> 50: 04 60 0d 00 00 00 00 00 00 10 11 01 00 00 33 33
> 60: 00 00 08 08 08 08 08 08 00 00 00 00 00 00 00 00
> 70: 00 03 00 00 00 00 00 00 04 02 01 28 79 02 67 20
> 80: 62 06 71 00 00 00 00 00 00 98 10 d2 8d 00 00 00
> 90: 00 00 00 00 00 00 00 00 55 05 55 05 01 1a 38 00
> a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> c0: 44 c0 50 11 00 20 ff 03 00 00 00 00 00 00 00 00
> d0: 02 28 00 0e 03 00 00 33 80 09 31 b5 00 00 01 01
> e0: 1d 1d 00 00 00 00 00 00 54 4a 00 00 00 00 00 00
> f0: 00 00 00 00 74 00 30 40 40 0f 00 00 00 00 00 00
> 
> 	
> -----Original Message-----
> From: steven james [mailto:pyro at linuxlabs.com] 
> Sent: 2003Äê4ÔÂ8ÈÕ 23:16
> To: Terry B. Chen
> Cc: linuxbios at clustermatic.org
> Subject: Re: 533Mhz FSB of E7501
> 
> Greetings,
> 
> Most likely, there is an undocumented register issue in the northbridge.
> 
> With the OEM BIOS, can you send me an lspci with a 400 FSB and a 533
> FSB. That should narrow things down.
> 
> G'day,
> sjames
> 
> 
> On Tue, 8 Apr 2003, Terry B. Chen wrote:
> 
> > Dear all;
> > 	I am trying the Tyan 2723(E7501), but I find it will report
> > spot_check error if the board run in 533 FSB. But if the CPU or the
> > memory is 400 FSB it will be ok. Does anyone else meet the same problem?
> > 	
> > Best regards
> > Terry chen
> > _______________________________________________
> > Linuxbios mailing list
> > Linuxbios at clustermatic.org
> > http://www.clustermatic.org/mailman/listinfo/linuxbios
> > 
> 
> 

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