staszek
Posts: 6
Joined: Tue Jul 22, 2014 6:36 am

Problem with new product Compute Module

Tue Jul 22, 2014 7:08 am

Hello,
I currently work with your new product - Raspberry Pi compute module.
I designed a board according to guidelines specified in documentation, but unfortunately the device does not start up.
At first I thought I made mistake with eMMC memory initialization, but after further analysis, it seems it's working properly though.
The processor alone seems like it's starting (LED blinks - just like in Starter Kit), but unfortunately nothing else is happening.
To thoroughly analyse problem I prepared a new test kit, to which I connected power from starter kit board and I led out UART in order to control it's work.
I spent many hours on technical documentation analysis and it seems like I have out of ideas now.
Voltages at the processor's reference points are correct.

Is there anything else I can check?

jamesh
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Re: Problem with new product Compute Module

Tue Jul 22, 2014 7:09 am

Presumably the card works correctly on the IO board?
Principal Software Engineer at Raspberry Pi (Trading) Ltd.
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staszek
Posts: 6
Joined: Tue Jul 22, 2014 6:36 am

Re: Problem with new product Compute Module

Tue Jul 22, 2014 7:16 am

Yes and I checked all of connection pins in my project and they seems ok.

James Adams
Raspberry Pi Engineer & Forum Moderator
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Location: Cambridge

Re: Problem with new product Compute Module

Tue Jul 22, 2014 9:02 pm

What software are you flashing onto the CM? Are you flashing the SW first then plugging CM into your board? I'm afraid you don't give nearly enough details to help debug this. Posting schematics would be best. Obviously you are doing something wrong but impossible to work out without more detail.
James Adams
Raspberry Pi - COO & Hardware Lead

staszek
Posts: 6
Joined: Tue Jul 22, 2014 6:36 am

Re: Problem with new product Compute Module

Thu Jul 24, 2014 1:05 pm

We used newest Raspbian available.

Unfortunately, I cannot share the schematics, but for verification we connected power socket according to documentation and UART lines in order to check work on service console.

CM_1.8 -> 1.8VDC (183-186)
CM_VDAC -> 3.3VDC (189-190)
CM_3V3 -> 3.3VDC (191-194)
CM_VBAT -> 3.3VDC (197-200)
GPIO0-27_VREF -> 3.3VDC (39-40)
GPIO28-45_VREF -> 3.3VDC (41-42)

Voltage used to power processor up was taken from Demo Board.
Addidtionally I checked reference points on processer and they are correct.

I ask for information about which exactly processor's pins have to be connected in order to have circuit started properly.

James Adams
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 121
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Location: Cambridge

Re: Problem with new product Compute Module

Thu Jul 24, 2014 1:08 pm

Should be fine. What are you doing with the RUN pin?
James Adams
Raspberry Pi - COO & Hardware Lead

staszek
Posts: 6
Joined: Tue Jul 22, 2014 6:36 am

Re: Problem with new product Compute Module

Thu Jul 24, 2014 1:22 pm

Left unconnected but I checked the short to ground in order to reset. Unfortunately nothing helped. In line VDD_CORE value is identical to the Demo Board.

James Adams
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 121
Joined: Wed Mar 19, 2014 2:58 pm
Location: Cambridge

Re: Problem with new product Compute Module

Thu Jul 24, 2014 1:26 pm

How about EMMC_DISABLE_N?
Can you try rpi-updating a latest Raspbian?
James Adams
Raspberry Pi - COO & Hardware Lead

staszek
Posts: 6
Joined: Tue Jul 22, 2014 6:36 am

Re: Problem with new product Compute Module

Thu Jul 24, 2014 1:34 pm

I connected EMMC_DISABLE_N to transistors analogically to CMIO board and module identification state change works properly. Used software is the newest one found on Raspberry's site and works ok with Demo Board.

Briarios
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Re: Problem with new product Compute Module

Thu Jul 24, 2014 1:35 pm

How about EMMC_DISABLE_N?
Beat me to it :P , was going to say that, but the next thing is how have you connected GPIO47? I know that you want to keep your schematic secret but are you able to display the schematic on how you have done the EMMC_DISABLE_N section?
http://rpi.pmfg.me -- Test board Eagle Cad Files.

James Adams
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
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Location: Cambridge

Re: Problem with new product Compute Module

Thu Jul 24, 2014 1:37 pm

Newest software downloadable from the site is not the very newest software (as this changes day by day). Try using rpi-update. See http://www.raspberrypi.org/documentatio ... pdating.md
James Adams
Raspberry Pi - COO & Hardware Lead

staszek
Posts: 6
Joined: Tue Jul 22, 2014 6:36 am

Re: Problem with new product Compute Module

Thu Jul 24, 2014 1:48 pm

Ok check and I'll answer tomorrow, but I think it is a hardware issue rather than software

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