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thefighter
nFHQ Member
Joined: 12 May 2006
Posts: 14
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 Posted: Mon Jul 24, 2006 2:36 pm Post subject: 80 cable problem with nForce4 |
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I'm trying to understand a problem behind a driver for nForce4 SATA. It tells me "I don't have the 80-cable conductor installed".
On the sata_nv driver for linux, the following is mentioned in a log when driver is loaded.
| Quote: |
| NFORCE-CK804-SATA: BIOS didn't set cable bits correctly. Enabling workaround. |
I need to know what this workaround is, what the code is and any other details about it. I cannot seem to find it anywhere after googling, just some posts that are not related and are from 2002
(If anybody could send me the sata_nv driver or post a link to an upload of it so I can look at the code, that would be great  )
Any help at all, would be greatly appriciated. Thank you all in advance 
TheFighter |
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TedTS
Friendly machine
Ultra nForced
Joined: 22 Jul 2004
Posts: 2607
Location: a big cloud
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| Posted: Mon Jul 24, 2006 3:37 pm Post subject: |
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80 cable on sata?!!!
i knew there are only 7
do you have any drives that use the ide controller? |
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thefighter
nFHQ Member
Joined: 12 May 2006
Posts: 14
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| Posted: Tue Jul 25, 2006 10:37 am Post subject: |
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| 80bit cable or something. Linux uses a workaround, and I need to know what it is. I cannot find it in the sata_nv.c code I've been looking at, can somebody please help. |
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thefighter
nFHQ Member
Joined: 12 May 2006
Posts: 14
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| Posted: Tue Jul 25, 2006 9:59 pm Post subject: |
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thefighter
nFHQ Member
Joined: 12 May 2006
Posts: 14
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| Posted: Thu Jul 27, 2006 11:10 am Post subject: |
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| C'mon! Somebody must know how it works, please! |
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pzgren
Linux Moderator
Moderator
Joined: 18 Jun 2003
Posts: 1081
Location: The old Europe, Germany
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| Posted: Fri Jul 28, 2006 5:15 pm Post subject: |
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| thefighter wrote: |
| C'mon! Somebody must know how it works, please! |
It seems you're using the ide driver amd74xx (AMD 755/756/766/8111 and nVidia nForce/2/2s/3/3s/CK804/MCP04) driver. Try if you can use the better and faster libata scsi driver...
From the source in linux-2.6.17.6/drivers/ide/pci/amd74xx.c
| Code: |
/*
* Check 80-wire cable presence.
*/
switch (amd_config->flags & AMD_UDMA) {
case AMD_UDMA_133:
case AMD_UDMA_100:
pci_read_config_byte(dev, AMD_CABLE_DETECT, &t);
pci_read_config_dword(dev, AMD_UDMA_TIMING, &u);
amd_80w = ((t & 0x3) ? 1 : 0) | ((t & 0xc) ? 2 : 0);
for (i = 24; i >= 0; i -= 8)
if (((u >> i) & 4) && !(amd_80w & (1 << (1 - (i >> 4))))) {
printk(KERN_WARNING "%s: BIOS didn't set cable bits correctly. Enabling workaround.\n",
amd_chipset->name);
amd_80w |= (1 << (1 - (i >> 4)));
}
break;
case AMD_UDMA_66:
/* no host side cable detection */
amd_80w = 0x03;
break;
}
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Marcus[/code] |
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thefighter
nFHQ Member
Joined: 12 May 2006
Posts: 14
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| Posted: Sun Jul 30, 2006 10:16 am Post subject: |
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I dont get it, I'm confused which bit is the actual workaround.
if (((u >> i) & 4) && !(amd_80w & (1 << (1 - (i >> 4))))) { This is the bit that decides whether the 80-wire cable is present.
It then echos the message and then performs the workaround:
amd_80w |= (1 << (1 - (i >> 4)));
But I do not understand what this is actually doing, I'm trying to convert this into the following:
| Code: |
if (ultraModeNumber > 2)
{
if ( f80PinCablePresent == false )
{
ERROR_LOG("%s: 80-conductor cable not detected on channel %u\n",
getName(), fChannelNumber);
ultraModeNumber = 2;
}
}
fBusTimings[unit].ultraEnabled = true;
fBusTimings[unit].ultraModeNumber = ultraModeNumber;
DEBUG_LOG(" selected Ultra mode %d\n", ultraModeNumber);
publishDriveProperty(unit, kSelectedUltraDMAModeKey, ultraModeNumber);
} |
I'm trying to make it so that when it =false it will run the workaround. I cannot figure it out, can anybody explain to me what the workaround is doing. And thanks for that code pzgren
TheFighter |
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pzgren
Linux Moderator
Moderator
Joined: 18 Jun 2003
Posts: 1081
Location: The old Europe, Germany
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| Posted: Sun Jul 30, 2006 1:15 pm Post subject: |
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| thefighter wrote: |
| I'm trying to make it so that when it =false it will run the workaround. I cannot figure it out, can anybody explain to me what the workaround is doing. And thanks for that code pzgren |
This is a problem with many bad BIOS! http://lkml.org/lkml/2005/8/1/59
Greetings,
Marcus |
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