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by tonyhansen
Tue Jun 16, 2020 3:53 pm
Forum: General discussion
Topic: Pi 4 RAM chip identification
Replies: 12
Views: 853

Re: Pi 4 RAM chip identification

Thank you everyone for the information. Thank you especially to @ejolson for providing the "magic decoder ring" URLs. To summarize the information so far: These are Micron Technology "Mobile LPDDR4" RAM chips. The first part of the code below contains a FBGA Date Code, so 9F would be 2019/week 12, 9...
by tonyhansen
Mon Jun 15, 2020 5:30 pm
Forum: General discussion
Topic: Pi 4 RAM chip identification
Replies: 12
Views: 853

Re: Pi 4 RAM chip identification

Thank you -- my take from that is that the chip layout changes will likely migrate to the other RAM configurations too. So, can anyone confirm if these codes are indeed consistent across all versions of the specific RAM sizes? Or at least part of the code? If only part of the code is consistent, whi...
by tonyhansen
Mon Jun 15, 2020 3:27 pm
Forum: General discussion
Topic: Pi 4 RAM chip identification
Replies: 12
Views: 853

Re: Pi 4 RAM chip identification

Currently there are visible differences in layout between the 8 Gbyte version and all others in the area between the AV jack and the USB sockets.
Are these layout differences specific to the use of 8GiB or will those layout changes be used going forward with other RAM models as well?
by tonyhansen
Mon Jun 15, 2020 1:42 am
Forum: General discussion
Topic: Pi 4 RAM chip identification
Replies: 12
Views: 853

Pi 4 RAM chip identification

The only visible difference between different models of the Pi4 in terms of RAM appears to be a code on the RAM chip itself. I have a limited sample, but the codes I have seen so far have been: 2GiB 9LD77 D9WHZ (sample of 1) 4GiB 9FD77 D9WHV (sample of 4) 8GiB OAA47 D9ZCL (sample of 2) Can anyone co...
by tonyhansen
Tue Feb 07, 2017 6:45 pm
Forum: Other projects
Topic: Screenly OSE -- Digital Signage for the Raspberry Pi
Replies: 1114
Views: 419603

Re: Screenly OSE -- Digital Signage for the Raspberry Pi

Turning off screenly OSE, stopping boot into screenly??? After installing OSE, I ran into some networking issues and cannot get into it over ssh. And OSE takes over the monitor, and eventually displays a message saying: Unable to resolve management IP At this point, I'm totally blocked from getting ...
by tonyhansen
Sun Oct 09, 2016 9:54 pm
Forum: Other projects
Topic: Screenly OSE -- Digital Signage for the Raspberry Pi
Replies: 1114
Views: 419603

Re: Screenly OSE -- Digital Signage for the Raspberry Pi

[Edit: adding a bit more info here] okay, I was successful in creating a pull request. I hope people find this mod useful. I just filed the issue "add support for HTTP Basic Authentication #493", but instead of just being a complaint, it includes a complete fix within it. (The pull request went in ...
by tonyhansen
Tue Oct 04, 2016 6:53 pm
Forum: Other projects
Topic: Screenly OSE -- Digital Signage for the Raspberry Pi
Replies: 1114
Views: 419603

Re: Screenly OSE -- Digital Signage for the Raspberry Pi

The grabbers to reorder the list don't seem to work on an iPad. Surely that must be an issue with the iPad browser's html implementation and nothing to do with screenly? Not necessarily. It might be something in the javascript, CSS or HTML used by screenly that is not fully cross-browser compatible...
by tonyhansen
Tue Oct 04, 2016 3:52 am
Forum: Other projects
Topic: Screenly OSE -- Digital Signage for the Raspberry Pi
Replies: 1114
Views: 419603

Re: Screenly OSE -- Digital Signage for the Raspberry Pi

I just installed Screenly OSE and like a lot about it. Thank you for all your efforts. There are a few areas I feel could use some attention. I found the script to enable HTTPS by poking around. This should be documented as being available, along with a note that it changes the admin interface from ...
by tonyhansen
Sat May 14, 2016 10:54 pm
Forum: Beginners
Topic: Sleep Mode - and or turn off backlight?
Replies: 206
Views: 114177

Re: Sleep Mode - and or turn off backlight?

Is there any way to tell via software which version of the official screen is in use? Not a one that's for sure but if you can control the brightness then it's a V1.1 or V2.0. if you can only control on off states, it's a V1.0. The easiest way is to look for it on the display board pcb. Unfortunate...
by tonyhansen
Sat May 14, 2016 5:33 pm
Forum: Beginners
Topic: Sleep Mode - and or turn off backlight?
Replies: 206
Views: 114177

Re: Sleep Mode - and or turn off backlight?

Is there any way to tell via software which version of the official screen is in use?
by tonyhansen
Sun Mar 13, 2016 10:04 pm
Forum: Beginners
Topic: Sleep Mode - and or turn off backlight?
Replies: 206
Views: 114177

Re: Sleep Mode - and or turn off backlight?

I'm wondering if the display initialization code can be encapsulated into a command that can be run after turning the power to the display back on.
by tonyhansen
Thu Feb 25, 2016 1:42 pm
Forum: Beginners
Topic: Sleep Mode - and or turn off backlight?
Replies: 206
Views: 114177

Re: Sleep Mode - and or turn off backlight?

jdb wrote:Yes, there has been a point release for the DSI display hardware.
....
I wanted to thank you for all of the solid information on what is different between the v1.0 and v1.1 controller boards. It is definitely appreciated.
by tonyhansen
Thu Feb 25, 2016 4:19 am
Forum: Beginners
Topic: Sleep Mode - and or turn off backlight?
Replies: 206
Views: 114177

Re: Sleep Mode - and or turn off backlight?

I too would be interested in the v1.1 boards. (I have two displays, so would need two.)
by tonyhansen
Sat Feb 20, 2016 12:14 pm
Forum: Beginners
Topic: Sleep Mode - and or turn off backlight?
Replies: 206
Views: 114177

Re: Sleep Mode - and or turn off backlight?

So the big questions are: what changed between the v1.0 and v1.1 board, can one just buy the upgraded video board, and is the change something a maker could do themselves?
by tonyhansen
Wed Feb 03, 2016 5:30 pm
Forum: Beginners
Topic: Sleep Mode - and or turn off backlight?
Replies: 206
Views: 114177

Re: Sleep Mode - and or turn off backlight?

Just a note about running commands as root. Running a command like echo > file opens the file with your current permissions and then runs the command. Running a command like sudo echo > file still opens the file with your current permissions and then runs the command sudo, which in turn changes to r...
by tonyhansen
Sat Jan 03, 2015 11:25 pm
Forum: General programming discussion
Topic: Can we control the on-board leds
Replies: 62
Views: 143471

Re: Can we control the on-board leds

mahjongg, thank you for the complete response, along with the additional information on controlling the other status LED.
by tonyhansen
Sat Jan 03, 2015 6:29 am
Forum: General programming discussion
Topic: Can we control the on-board leds
Replies: 62
Views: 143471

Re: Can we control the on-board leds

With the Raspberry Pi model B+, a program I had that used GPIO16 to drive the STATUS OK LED on the Raspberry Pi model B no longer works . Given that GPIO16 is now exposed on pin36 of the 40-pin header, I'm not too surprised. However, this does beg the question: besides writing to /sys/class/leds/led...

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