Re: [beagleboard] Beaglebone Black won't boot when gpio connections made

2018-11-30 Thread Gerhard Hoffmann 
In principle yes, but given that you won't need that many bits and that 
the BBB pins


are relatively weak drivers and the ground connections on the BBB are a 
joke, I prefer


74LVC244 / 74LVC245 or similar. They present less load to the BBB and 
are also much


more common, mainstream devices, and cheap.

Cheers, Gerhard


p.s.

Has anybody tested out what it takes to isolate that 16 bit multiplexed bus?


Am 01.12.18 um 02:31 schrieb Mike Brandon:

Actually, one more question before I go cry myself to sleep...

Considering I will want to make similar connections on P8 in the 
future... can I use a device like this to isolate the boot pins at boot?


http://www.ti.com/lit/ds/symlink/sn74cbtd16211.pdf



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Re: [beagleboard] Beaglebone Black won't boot when gpio connections made

2018-11-30 Thread Mike Brandon 
Actually, one more question before I go cry myself to sleep...

Considering I will want to make similar connections on P8 in the future... 
can I use a device like this to isolate the boot pins at boot?

http://www.ti.com/lit/ds/symlink/sn74cbtd16211.pdf

On Friday, November 30, 2018 at 8:29:32 PM UTC-5, Mike Brandon wrote:
>
> HAH, wow it has been a long day. It must be time for me to put this aside 
> for a bit... WOW. Sometimes I amaze myself.
>
> Thanks and sorry that my goof has taken up a small bit of ya'lls valuable 
> time.
>
> Until my next stupid question...
>
> On Friday, November 30, 2018 at 8:24:45 PM UTC-5, RobertCNelson wrote:
>>
>>
>>
>> On Fri, Nov 30, 2018 at 7:12 PM Mike Brandon  wrote:
>>
>>> [image: IMG_20181130_194825.jpg]
>>>
>>> [image: IMG_20181130_194818.jpg]
>>>
>>>
>> On Fri, Nov 30, 2018 at 4:38 PM Mike Brandon  wrote: 
 > 
 > But which gpio am I using that is a boot pin? In the reference 
 manual, the 16 boot pins are on the P8 header... I'm using gpios on the P9 
 header. 
 > 


>> From your picture, that's the P8 header...
>>
>> Regards,
>>
>> -- 
>> Robert Nelson
>> https://rcn-ee.com/
>>
>

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Re: [beagleboard] Beaglebone Black won't boot when gpio connections made

2018-11-30 Thread Mike Brandon 
HAH, wow it has been a long day. It must be time for me to put this aside 
for a bit... WOW. Sometimes I amaze myself.

Thanks and sorry that my goof has taken up a small bit of ya'lls valuable 
time.

Until my next stupid question...

On Friday, November 30, 2018 at 8:24:45 PM UTC-5, RobertCNelson wrote:
>
>
>
> On Fri, Nov 30, 2018 at 7:12 PM Mike Brandon  > wrote:
>
>> [image: IMG_20181130_194825.jpg]
>>
>> [image: IMG_20181130_194818.jpg]
>>
>>
> On Fri, Nov 30, 2018 at 4:38 PM Mike Brandon  wrote: 
>>> > 
>>> > But which gpio am I using that is a boot pin? In the reference manual, 
>>> the 16 boot pins are on the P8 header... I'm using gpios on the P9 header. 
>>> > 
>>>
>>>
> From your picture, that's the P8 header...
>
> Regards,
>
> -- 
> Robert Nelson
> https://rcn-ee.com/
>

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RE: [beagleboard] Beaglebone Black won't boot when gpio connections made

2018-11-30 Thread Gerald Coley 
Looks like you may be conflicted with the eMMC pins, which also go to the 
expansion headers.

[cid:image001.png@01D488DB.E1A48D20]

I do not know if the MMC ports are numbered 0 and 1 or 1 and 2 these days in 
SW. But normally the board boots from the eMMC. On the Hardware we numbered 
them 0 and 1, 0 being the SD card and 1 being the eMMC. You can insert a 
bootable SD card and see if it boots from there.

Gerald

From: beagleboard@googlegroups.com [mailto:beagleboard@googlegroups.com] On 
Behalf Of Mike Brandon
Sent: Friday, November 30, 2018 5:09 PM
To: BeagleBoard 
Subject: Re: [beagleboard] Beaglebone Black won't boot when gpio connections 
made

U-Boot SPL 2017.03-2-gd12b1519b4 (Mar 14 2017 - 10:28:26)
Trying to boot from MMC2
mmc_load_image_raw_sector: mmc block read error
spl_register_fat_device: fat register err - -1
spl_load_image_fat: error reading image u-boot.img, err - -1
 ** ext4fs_devread read error - block
Failed to mount ext2 filesystem...
spl_load_image_ext: ext4fs mount err - 0



On Friday, November 30, 2018 at 5:55:16 PM UTC-5, RobertCNelson wrote:
On Fri, Nov 30, 2018 at 4:38 PM Mike Brandon > 
wrote:
>
> But which gpio am I using that is a boot pin? In the reference manual, the 16 
> boot pins are on the P8 header... I'm using gpios on the P9 header.
>

Does anything show up over serial when it's plugged in? And what shows up?

Regards,

--
Robert Nelson
https://rcn-ee.com/
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RE: [beagleboard] Beaglebone Black won't boot when gpio connections made

2018-11-30 Thread Gerald Coley 
Then there must me somethig else at play here. Without  a schematic, kind of 
hard to tell.

-Original Message-
From: beagleboard@googlegroups.com [mailto:beagleboard@googlegroups.com] On 
Behalf Of Mike Brandon
Sent: Friday, November 30, 2018 4:38 PM
To: BeagleBoard 
Subject: Re: [beagleboard] Beaglebone Black won't boot when gpio connections 
made

But which gpio am I using that is a boot pin? In the reference manual, the 16 
boot pins are on the P8 header... I'm using gpios on the P9 header.


On Friday, November 30, 2018 at 5:03:42 PM UTC-5, gcoley1 wrote:
> It just take on boot pin to mess up the boot process. If it is not powered on 
> it still presents a load. It still affects the boot pins.
> 
>  
> 
> Key point…DO NOT PUT ANYTHNING on GPIO pins that share the boot function on 
> power up.
> 
>  
> 
> Gerald
> 
>  
> 
>  
> 
> From: beagl...@googlegroups.com [mailto:beagl...@googlegroups.com]
> On Behalf Of Mike Brandon
> 
> Sent: Friday, November 30, 2018 3:07 PM
> 
> To: BeagleBoard 
> 
> Subject: Re: [beagleboard] Beaglebone Black won't boot when gpio 
> connections made
> 
>  
> 
> 
> 
> Gerald,
> 
> 
> 
>  
> 
> 
> 
> 
> Thanks for pointing me to that information but I don't see where I am 
> utilizing one of the 16 boot pins on the expansion header.
> 
> 
> 
> 
>  
> 
> 
> 
> 
> Also, my external device that is connected to the GPIO listed above is not 
> powered up at boot.
> 
> 
> 
> 
>  
> 
> 
> 
> 
> Am I missing another key point in the reference you pointed me to?
> 
> 
> 
> 
>  
> 
> 
> 
> 
> Mike
> 
> 
> 
> On Friday, November 30, 2018 at 3:54:42 PM UTC-5, gcoley1 wrote:
> 
> 
> 
> 
> 
> 
> Yep, you are changing the boot mode of the processor. A big no no.
> 
>  
> 
> https://www.elinux.org/Beagleboard:BeagleBoneBlack#Expansion_Header_Pi
> n_Usage
> 
>  
> 
> Gerald
> 
>  
> 
>  
> 
> From:
> beagl...@googlegroups.com [mailto:beagl...@googlegroups.com]
> On Behalf Of Mike Brandon
> 
> Sent: Friday, November 30, 2018 2:52 PM
> 
> To: BeagleBoard 
> 
> Subject: [beagleboard] Beaglebone Black won't boot when gpio 
> connections made
> 
>  
> 
> 
> 
> I have a device plugged in via GPIO to the following gpio pins:
> 
> 
> 
>  
> 
> 
> 
> 
> 48
> 
> 
> 
> 
> 49
> 
> 
> 
> 
> 115
> 
> 
> 
> 
> 117
> 
> 
> 
> 
>  
> 
> 
> 
> 
> If my device is connected at boot, the BB will not boot.
> 
> 
> 
> 
>  
> 
> 
> 
> 
> I am booting from eMMC. Any idea why this is occurring? I am using the 
> attached custom overlay which is essentially the univ-emmc overlay with some 
> modifications on GPIOs not listed  above.
> 
> 
> 
> 
>  
> 
> 
> 
> 
> Mike
> 
> 
> 
> 
>  
> 
> 
> 
> 
>  
> 
> 
> 
> --
> 
> 
> For more options, visit
> http://beagleboard.org/discuss
> 
> ---
> 
> You received this message because you are subscribed to the Google Groups 
> "BeagleBoard" group.
> 
> To unsubscribe from this group and stop receiving emails from it, send 
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> 
> For more options, visit
> https://groups.google.com/d/optout.
> 
> 
> 
> 
> 
> 
> --
> 
> For more options, visit http://beagleboard.org/discuss
> 
> ---
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Re: [beagleboard] Beaglebone Black won't boot when gpio connections made

2018-11-30 Thread Mike Brandon 
U-Boot SPL 2017.03-2-gd12b1519b4 (Mar 14 2017 - 10:28:26)
Trying to boot from MMC2
mmc_load_image_raw_sector: mmc block read error
spl_register_fat_device: fat register err - -1
spl_load_image_fat: error reading image u-boot.img, err - -1
 ** ext4fs_devread read error - block
Failed to mount ext2 filesystem...
spl_load_image_ext: ext4fs mount err - 0



On Friday, November 30, 2018 at 5:55:16 PM UTC-5, RobertCNelson wrote:
>
> On Fri, Nov 30, 2018 at 4:38 PM Mike Brandon  > wrote: 
> > 
> > But which gpio am I using that is a boot pin? In the reference manual, 
> the 16 boot pins are on the P8 header... I'm using gpios on the P9 header. 
> > 
>
> Does anything show up over serial when it's plugged in? And what shows up? 
>
> Regards, 
>
> -- 
> Robert Nelson 
> https://rcn-ee.com/ 
>

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Re: [beagleboard] Beaglebone Black won't boot when gpio connections made

2018-11-30 Thread Robert Nelson 
On Fri, Nov 30, 2018 at 4:38 PM Mike Brandon  wrote:
>
> But which gpio am I using that is a boot pin? In the reference manual, the 16 
> boot pins are on the P8 header... I'm using gpios on the P9 header.
>

Does anything show up over serial when it's plugged in? And what shows up?

Regards,

-- 
Robert Nelson
https://rcn-ee.com/

-- 
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Re: [beagleboard] Beaglebone Black won't boot when gpio connections made

2018-11-30 Thread Mike Brandon 
But which gpio am I using that is a boot pin? In the reference manual, the 16 
boot pins are on the P8 header... I'm using gpios on the P9 header.


On Friday, November 30, 2018 at 5:03:42 PM UTC-5, gcoley1 wrote:
> It just take on boot pin to mess up the boot process. If it is not powered on 
> it still presents a load. It still affects the boot pins.
> 
>  
> 
> Key point…DO NOT PUT ANYTHNING on GPIO pins that share the boot function on 
> power up.
> 
>  
> 
> Gerald
> 
>  
> 
>  
> 
> From: beagl...@googlegroups.com [mailto:beagl...@googlegroups.com]
> On Behalf Of Mike Brandon
> 
> Sent: Friday, November 30, 2018 3:07 PM
> 
> To: BeagleBoard 
> 
> Subject: Re: [beagleboard] Beaglebone Black won't boot when gpio connections 
> made
> 
>  
> 
> 
> 
> Gerald,
> 
> 
> 
>  
> 
> 
> 
> 
> Thanks for pointing me to that information but I don't see where I am 
> utilizing one of the 16 boot pins on the expansion header.
> 
> 
> 
> 
>  
> 
> 
> 
> 
> Also, my external device that is connected to the GPIO listed above is not 
> powered up at boot.
> 
> 
> 
> 
>  
> 
> 
> 
> 
> Am I missing another key point in the reference you pointed me to?
> 
> 
> 
> 
>  
> 
> 
> 
> 
> Mike
> 
> 
> 
> On Friday, November 30, 2018 at 3:54:42 PM UTC-5, gcoley1 wrote:
> 
> 
> 
> 
> 
> 
> Yep, you are changing the boot mode of the processor. A big no no.
> 
>  
> 
> https://www.elinux.org/Beagleboard:BeagleBoneBlack#Expansion_Header_Pin_Usage
> 
>  
> 
> Gerald
> 
>  
> 
>  
> 
> From:
> beagl...@googlegroups.com [mailto:beagl...@googlegroups.com]
> On Behalf Of Mike Brandon
> 
> Sent: Friday, November 30, 2018 2:52 PM
> 
> To: BeagleBoard 
> 
> Subject: [beagleboard] Beaglebone Black won't boot when gpio connections made
> 
>  
> 
> 
> 
> I have a device plugged in via GPIO to the following gpio pins:
> 
> 
> 
>  
> 
> 
> 
> 
> 48
> 
> 
> 
> 
> 49
> 
> 
> 
> 
> 115
> 
> 
> 
> 
> 117
> 
> 
> 
> 
>  
> 
> 
> 
> 
> If my device is connected at boot, the BB will not boot.
> 
> 
> 
> 
>  
> 
> 
> 
> 
> I am booting from eMMC. Any idea why this is occurring? I am using the 
> attached custom overlay which is essentially the univ-emmc overlay with some 
> modifications on GPIOs not listed
>  above.
> 
> 
> 
> 
>  
> 
> 
> 
> 
> Mike
> 
> 
> 
> 
>  
> 
> 
> 
> 
>  
> 
> 
> 
> --
> 
> 
> For more options, visit 
> http://beagleboard.org/discuss
> 
> --- 
> 
> You received this message because you are subscribed to the Google Groups 
> "BeagleBoard" group.
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> For more options, visit 
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> 
> 
> 
> 
> 
> 
> -- 
> 
> For more options, visit http://beagleboard.org/discuss
> 
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RE: [beagleboard] Beaglebone Black won't boot when gpio connections made

2018-11-30 Thread Gerald Coley 
It just take on boot pin to mess up the boot process. If it is not powered on 
it still presents a load. It still affects the boot pins.

Key point…DO NOT PUT ANYTHNING on GPIO pins that share the boot function on 
power up.

Gerald


From: beagleboard@googlegroups.com [mailto:beagleboard@googlegroups.com] On 
Behalf Of Mike Brandon
Sent: Friday, November 30, 2018 3:07 PM
To: BeagleBoard 
Subject: Re: [beagleboard] Beaglebone Black won't boot when gpio connections 
made

Gerald,

Thanks for pointing me to that information but I don't see where I am utilizing 
one of the 16 boot pins on the expansion header.

Also, my external device that is connected to the GPIO listed above is not 
powered up at boot.

Am I missing another key point in the reference you pointed me to?

Mike

On Friday, November 30, 2018 at 3:54:42 PM UTC-5, gcoley1 wrote:
Yep, you are changing the boot mode of the processor. A big no no.

https://www.elinux.org/Beagleboard:BeagleBoneBlack#Expansion_Header_Pin_Usage

Gerald


From: beagl...@googlegroups.com 
[mailto:beagl...@googlegroups.com] On Behalf Of Mike Brandon
Sent: Friday, November 30, 2018 2:52 PM
To: BeagleBoard >
Subject: [beagleboard] Beaglebone Black won't boot when gpio connections made

I have a device plugged in via GPIO to the following gpio pins:

48
49
115
117

If my device is connected at boot, the BB will not boot.

I am booting from eMMC. Any idea why this is occurring? I am using the attached 
custom overlay which is essentially the univ-emmc overlay with some 
modifications on GPIOs not listed above.

Mike


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Re: [beagleboard] Beaglebone Black won't boot when gpio connections made

2018-11-30 Thread Gerhard Hoffmann 
Yes. And sys_reset_n is just a RC-delayed version of the 3V3 supply. It 
is not debounced


if activated by the reset switch and rises slowly in the classic 
1-e-function style.


You need a Schmidt-trigger if you want to use it as a logic signal.

That sys_reset_n is high does not mean that you may drive some pins

(in my case P8. 39-46, the 8 pins accessible to PRU1 and also used by 
the LCD.)


I found that I had to use an 74LVC244 for isolation; the 3stated pins of a

Xilinx Coolrunner II were not high-impedance enough.


When sys_reset_n goes away, the processor just starts; it has not yet 
made up


its mind where to boot from.

I used a time constant of 3 times sys_reset_n to enable the 74lvc244.

regards, Gerhard




Am 30.11.18 um 21:54 schrieb Gerald Coley:


Yep, you are changing the boot mode of the processor. A big no no.

https://www.elinux.org/Beagleboard:BeagleBoneBlack#Expansion_Header_Pin_Usage

Gerald

*From:*beagleboard@googlegroups.com 
[mailto:beagleboard@googlegroups.com] *On Behalf Of *Mike Brandon

*Sent:* Friday, November 30, 2018 2:52 PM
*To:* BeagleBoard 
*Subject:* [beagleboard] Beaglebone Black won't boot when gpio 
connections made


I have a device plugged in via GPIO to the following gpio pins:





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Re: [beagleboard] Beaglebone Black won't boot when gpio connections made

2018-11-30 Thread Mike Brandon 
Gerald,

Thanks for pointing me to that information but I don't see where I am 
utilizing one of the 16 boot pins on the expansion header.

Also, my external device that is connected to the GPIO listed above is not 
powered up at boot.

Am I missing another key point in the reference you pointed me to?

Mike

On Friday, November 30, 2018 at 3:54:42 PM UTC-5, gcoley1 wrote:
>
> Yep, you are changing the boot mode of the processor. A big no no.
>
>  
>
>
> https://www.elinux.org/Beagleboard:BeagleBoneBlack#Expansion_Header_Pin_Usage
>
>  
>
> Gerald
>
>  
>
>  
>
> *From:* beagl...@googlegroups.com  [mailto:
> beagl...@googlegroups.com ] *On Behalf Of *Mike Brandon
> *Sent:* Friday, November 30, 2018 2:52 PM
> *To:* BeagleBoard >
> *Subject:* [beagleboard] Beaglebone Black won't boot when gpio 
> connections made
>
>  
>
> I have a device plugged in via GPIO to the following gpio pins:
>
>  
>
> 48
>
> 49
>
> 115
>
> 117
>
>  
>
> If my device is connected at boot, the BB will not boot.
>
>  
>
> I am booting from eMMC. Any idea why this is occurring? I am using the 
> attached custom overlay which is essentially the univ-emmc overlay with 
> some modifications on GPIOs not listed above.
>
>  
>
> Mike
>
>  
>
>  
>
> -- 
> For more options, visit http://beagleboard.org/discuss
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> You received this message because you are subscribed to the Google Groups 
> "BeagleBoard" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
> email to beagleboard...@googlegroups.com .
> To view this discussion on the web visit 
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>  
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

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RE: [beagleboard] Beaglebone Black won't boot when gpio connections made

2018-11-30 Thread Gerald Coley 
Yep, you are changing the boot mode of the processor. A big no no.

https://www.elinux.org/Beagleboard:BeagleBoneBlack#Expansion_Header_Pin_Usage

Gerald


From: beagleboard@googlegroups.com [mailto:beagleboard@googlegroups.com] On 
Behalf Of Mike Brandon
Sent: Friday, November 30, 2018 2:52 PM
To: BeagleBoard 
Subject: [beagleboard] Beaglebone Black won't boot when gpio connections made

I have a device plugged in via GPIO to the following gpio pins:

48
49
115
117

If my device is connected at boot, the BB will not boot.

I am booting from eMMC. Any idea why this is occurring? I am using the attached 
custom overlay which is essentially the univ-emmc overlay with some 
modifications on GPIOs not listed above.

Mike


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