Tony Harris
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Joined: Tue Jan 16, 2018 11:07 pm

Pi Zero W No WiFi Possible Board Revision Issue [solved]

Tue Jan 16, 2018 11:42 pm

Hello
First post.
Trying to diagnose my Pi Zero W's 'No WiFi' problem has led me to believe that I have an incorrectly programmed board.
/proc/cpuinfo contains revision value 000f whereas Line 30 in vcgencmd otp_dump contains value of 00000000
I've tried various Stretch and Jessie packages and everything else on the Zero W seems to work ok, including wlan0 if I add a usb wifi dongle but the symptoms are no onboard wifi and no act led. All packages work fine on my Pi3
I'd be grateful for any help as to whether I'm on the right track with my diagnosis.
Thanks in advance, I can provide more details if needed.

mattmiller
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Re: Pi Zero W No WiFi Possible Board Revision Issue

Wed Jan 17, 2018 8:37 am

For the sake of another $10 (plus taxes and shipping) - I'd get another PiZeroW as its going to be by far the easiest way to determine whether you have a hardware or a software issue

Tony Harris
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Re: Pi Zero W No WiFi Possible Board Revision Issue

Wed Jan 17, 2018 8:47 am

I've got one of the new ones with pre-soldered header on order. Still keen to understand the technical issue.

mattmiller
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Re: Pi Zero W No WiFi Possible Board Revision Issue

Wed Jan 17, 2018 9:01 am

Still keen to understand the technical issue.
IMO - the quickest way to understand the technical issue is to have another one to compare/contrast :)

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RaTTuS
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Re: Pi Zero W No WiFi Possible Board Revision Issue

Wed Jan 17, 2018 9:11 am

/proc/cpuinfo contains revision value 000f
means it thinks it is a pi1 there is a way of reprogramming it but I dont know how OTTOMH
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piglet
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Re: Pi Zero W No WiFi Possible Board Revision Issue

Wed Jan 17, 2018 9:27 am

RaTTuS wrote:
Wed Jan 17, 2018 9:11 am
means it thinks it is a pi1 there is a way of reprogramming it but I dont know how OTTOMH
I didn't know what OTTOMH meant, off the top of my head.

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RaTTuS
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Re: Pi Zero W No WiFi Possible Board Revision Issue

Wed Jan 17, 2018 9:28 am

;-p ... currently trying to find a post on how you program the bits if they have not been set ....
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RaTTuS
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Re: Pi Zero W No WiFi Possible Board Revision Issue

Wed Jan 17, 2018 9:41 am

see
viewtopic.php?f=43&t=160611

someone will be ablong at some stage to tell you how to to make it permanent
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Tony Harris
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Re: Pi Zero W No WiFi Possible Board Revision Issue

Wed Jan 17, 2018 11:51 am

Thanks for that link, I tried to force it using the info here https://github.com/raspberrypi/firmware/issues/758.

But that resulted in no boot and continuous 4 long 4 short act led flashing, first time I'd seen the act led light up though!

I'll try the other values and report back.

Tony Harris
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Re: Pi Zero W No WiFi Possible Board Revision Issue

Thu Jan 18, 2018 8:39 am

Forcing it with 0x900093 brings the act led to life and it boots ok, but still no wifi.

There's more info here viewtopic.php?t=178362

Looks like there may be a few of these about.

Tony Harris
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Re: Pi Zero W No WiFi Possible Board Revision Issue

Fri Jan 19, 2018 7:08 pm

Update, have received new Zero W and its cpuinfo version and line 30 of vcgencmd otp_dump both read 009000c1
So my initial diagnosis appears correct.
Hope this helps anyone else with the same symptoms.

jesperdj
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Joined: Thu May 10, 2018 12:15 pm

Re: Pi Zero W No WiFi Possible Board Revision Issue [solved]

Sat May 12, 2018 10:18 pm

Forcing it with 0x900093 brings the act led to life and it boots ok, but still no wifi.
That's because code 0x900093 is for the Pi Zero V1.3 which does not have WiFi / bluetooth and not the Pi Zero W.

You would need to use 0x9000c1 instead for the Pi Zero W V1.1 as you can see in this table: https://elinux.org/RPi_HardwareHistory

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