[MinnowBoard] HDMI level shifters and revision A4

[Anders, David]

Leigh,

See this bug report:

https://bugzilla.yoctoproject.org/show_bug.cgi?id=7719

specifically the TFP401 and TFP501 chips from TI are not working with the MinnowBoard Max. the issue appears to be a firmware , not hardware issue, and is being worked on…

thanks
Dave

From: elinux-MinnowBoard [mailto:elinux-minnowboard-bounces at lists.elinux.org] On Behalf Of Leigh Gawne
Sent: Sunday, June 7, 2015 2:43 AM
To: MinnowBoard Development and Community Discussion
Subject: Re: [MinnowBoard] HDMI level shifters and revision A4


Hi Dave,

I am using the TI TFP401 as the DVI decoder.

I thought about spinning another revision of the board with an additional level shifter, but given that these are present on the A4 revision, my preference is just to get this revision and everything should play nice.

Thanks,

Leigh
On 6 Jun 2015 11:21 pm, "Anders, David" <david.anders at intel.com<mailto:david.anders at intel.com>> wrote:
Leigh,

We have found that there are some DVI receiver chips that are of issue with the minnowboard max. which chipset are you using to covert from HDMI/DVI to LVDS?

Dave

From: elinux-MinnowBoard [mailto:elinux-minnowboard-bounces at lists.elinux.org<mailto:elinux-minnowboard-bounces at lists.elinux.org>] On Behalf Of Leigh Gawne
Sent: Saturday, June 6, 2015 6:46 AM
To: elinux-minnowboard at lists.elinux.org<mailto:elinux-minnowboard at lists.elinux.org>
Subject: [MinnowBoard] HDMI level shifters and revision A4

Hi guys,

I have a customised daughterboard for the Minnoxboard Max which includes an HDMI to LVDS subsystem. During test, I have found that some boards are unable to drive the connected LCD display panel. Further investigation leads me to believe that it is the missing level shifters on the Minnowboard Max which mean that this is not working as expected (connecting other HDMI sources to the board, i.e. PC, etc. work absolutely fine. Inspection of the diff pair levels on a scope shows that it is definitely marginal).

I understand that revision A4 of the board (https://bugzilla.yoctoproject.org/show_bug.cgi?id=7027) will include these level shifters. My question is whether this revision of the board is available yet, and if so, how I couple go about ordering a couple of them for test to ensure it solves my problem. I purchase around 10 boards around a month or so ago, and these are all revision A2.

Any insights or additional information would be most helpful.

Regards,

Leigh

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