I've got an answer from Unicorn.
If you've got the issue,you have to switch the mode into “Enhanced Mode” of
On-Chip Serial ATA to solve the problem.
See the attached bios screenshot.
** Attachment added: image003.jpg
This bug can be closed as the issue was fixed with a BIOS update from
Unicorn.
Thanks for your help.
** Description changed:
I am using a Unicorn computers ENDAT-2794A motherboard
http://www.unicorn-computer.com.tw/products/itx/2794a.html
With the stock latest release of ubuntu 11.10.
Attached is the install log from Ubuntu 8.04.4 live USB and shows the same
problem. I'm not sure how Unicorn verified that it works, they are also
reporting 11.10 works.
To test if it was a individual hardware fault I have used a different board for
this test but it acts exactly the same.
**
I'm not sure where to look to help debugging this issue, shall I take it
to the linux-ide mailing list. See if they have any suggestions?
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Title:
@ben
Yes, please do.
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Title:
DMA bug with ICH7-M
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@Brad
I have tried the snapshot dated yesterday (29th November) and it
exhibits the same problem.
Unicorn computers have confirmed that it used to work with older kernels it
seems, I have not had a chance to verify this. Here is their list of examples;
NAMEKERNEL
Debian 4.0
@ben,
Those are some very old kernels. Maybe the safest one to start with
would be the Lucid (10.04) release.
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Title:
DMA bug with ICH7-M
To
@Brad
That they are, I have run up a USB image of 10.04 LTS and it cant install to
the harddrive.
However, it is not the complaining about the DMA in dmesg but it does stay on
UDMA/133 which is an old bug and out of spec for ICH7, fixed in ata_piix since
then.
I have attached dmesg from 10.04
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Title:
DMA bug with ICH7-M
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** Changed in: linux (Ubuntu)
Status: New = Confirmed
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Title:
DMA bug with ICH7-M
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@Ben,
Is this the first time that you've tried to install Ubuntu onto this
system? If it was running a previous version, can you tell us which
version was successfully running?
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** Changed in: linux (Ubuntu)
Importance: Undecided = High
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Title:
DMA bug with ICH7-M
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@Brad
This is the first time I have tried personally, however this is an industrial
grade board and the manufacturers state linux runs on it. I have contacted them
to confirm what version of the kernel they can run on it without issue to try
and narrow it down.
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@Ben,
If you want to try to narrow this down, you could download a daily ISO
of the current development series [1] and try that. You could also pull
down the Natty release[2] and try that as well. I'd suggest the current
development series first if possible.
[1]
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