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by jamesh
Thu Jan 17, 2019 9:55 am
Forum: General discussion
Topic: Possibility of Raspberry pi crash
Replies: 10
Views: 225

Re: Possibility of Raspberry pi crash

Can you explain how we have sold millions of devices in to embedded devices and people still keep coming back and buying more of them for exactly that? I mean, literally, 50k at a time type of sales... The HW can do it, you just tune the software for your particular use case. I've been an embedded S...
by jamesh
Wed Jan 16, 2019 8:54 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Linux ioctl SPI "discussion" - anybody?
Replies: 7
Views: 130

Re: Linux ioctl SPI "discussion" - anybody?

HW can be weird, often needing some sort of odd sequence to kick it in to life after boot up. Maybe that its, just soime dummy bytes whilst its gets itself going.

Who knows? And posting source code does make this sort of thing easier, having a disucssion without examples can be painful.
by jamesh
Wed Jan 16, 2019 8:51 pm
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 2145

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

and its so easy to circumvent it's not going to increase security overmuch. Can you tell me how easy it is to circument when you have glued the SD-Card and a shake sensor. Shakesensor leads to key erase after noticing shake. This little peace of hardware will cost in total much below 5 $. I'll buil...
by jamesh
Wed Jan 16, 2019 6:04 pm
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 2145

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

To further pour water on the "bootrom zeroes SDRAM" argument: the bootrom is incapable of setting up the SDRAM. Different chip manufacturers have different bus timings and each of these need to be stored in a table somewhere. In addition, once you start the SDRAM running then you need routines to m...
by jamesh
Wed Jan 16, 2019 1:47 pm
Forum: Camera board
Topic: raspivid doesn't include b-frames
Replies: 4
Views: 95

Re: raspivid doesn't include b-frames

That perfectly makes sense. So can I create h264 stream with software encoder and how? Latency and quality of video is not important, I just need to create an application to read h264 stream and parse the I-P-B frames. I only have Raspberry Pi and Pi Camera to create stream. You would need to use t...
by jamesh
Wed Jan 16, 2019 1:42 pm
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 2145

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

I'd suggest human right activists use file by file encryption File encryption certainly has it uses when you want to send files to someone else, and want to protect it in transit. But the protection it offers against someone gaining access to your storage is inadequate, because it is very easy to o...
by jamesh
Wed Jan 16, 2019 11:37 am
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 2145

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

I suspect the added sales would take the digits up both hands and possibly one foot. Simply not high enough demand to do it. There is no 'massive profit' here. Lets say we change the bootloader in the SoC to zero RAM on startup. However, we make a mistake that get through simulation, and it stops th...
by jamesh
Tue Jan 15, 2019 6:07 pm
Forum: Camera board
Topic: Sharpness setting on Camera Board V2 Sony IMX219
Replies: 9
Views: 1447

Re: Sharpness setting on Camera Board V2 Sony IMX219

The sharpness should be pretty good, the sharpen block is used, it's just that it is not particularly noticeable when you change the value.

It's possible your sensor is out of focus, I'd check that first.
by jamesh
Tue Jan 15, 2019 5:31 pm
Forum: General discussion
Topic: New SystemD Vulnerabilities
Replies: 9
Views: 790

Re: New SystemD Vulnerabilities

Almost certainly, but I suspect fixes will be available in fairly short order.
by jamesh
Tue Jan 15, 2019 10:49 am
Forum: Beginners
Topic: Can I run 2 different OS on 2 different sd cards in the same raspberry pi board?
Replies: 10
Views: 814

Re: Can I run 2 different OS on 2 different sd cards in the same raspberry pi board?

DarkPlatinum wrote:
Tue Jan 15, 2019 10:38 am
May I ask why you want to do this? It would be best to save money by buying a 1 TB HDD and putting all your OSes on there.
For some people, maybe, but not everyone. No-one in the Pi offices uses the devices like that.
by jamesh
Tue Jan 15, 2019 10:01 am
Forum: Troubleshooting
Topic: Raspbian 2018-11-13 - Video Playback Broken
Replies: 16
Views: 407

Re: Raspbian 2018-11-13 - Video Playback Broken

Some of the posts above have resulted in a temporary ban for someone. Please keep it civil, the tone of the language in the posts above is completely unnecessary. If you have something constructive to say, help yourself, but once you start shouting about trolling, or slagging off developers, you hav...
by jamesh
Tue Jan 15, 2019 9:54 am
Forum: Beginners
Topic: Raspberry Samba/CIFS Documentation incomplete?
Replies: 9
Views: 429

Re: Raspberry Samba/CIFS Documentation incomplete?

Not rude, a fact. A removed myself from git-hub when Microsoft bought it, so I cannot do anything there. I contacted rpi to advise them that the share set up was totally wrong and what came of it ? My first email was ignored and my follow up to it was virtually ignored. If you are wondering why I a...
by jamesh
Tue Jan 15, 2019 7:34 am
Forum: Beginners
Topic: Raspberry Samba/CIFS Documentation incomplete?
Replies: 9
Views: 429

Re: Raspberry Samba/CIFS Documentation incomplete?

Good luck with that, I told them the documentation was wrong, but they didn't want to know. Try reading the Samba documentation: https://wiki.samba.org/index.php/Setting_up_Samba_as_a_Standalone_Server It doesn't mention the rpi, but it is correct and should point you in the right direction. How ru...
by jamesh
Mon Jan 14, 2019 9:57 pm
Forum: General discussion
Topic: Multiple Frame buffer beta testers wanted
Replies: 333
Views: 24093

Re: Multiple Frame buffer beta testers wanted

Double touch screens I didn't look at, so cannot help with that.
by jamesh
Mon Jan 14, 2019 9:56 pm
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 2145

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

Can you explain why this little code change for future devices would cost large sums of money? Because it is almost certain that the design of whatever will become the Pi4 is already at an advanced stage, so it would have to be taken back to an earlier stage and reworked. If the Pi4 is based on exi...
by jamesh
Mon Jan 14, 2019 5:08 pm
Forum: General discussion
Topic: Multiple Frame buffer beta testers wanted
Replies: 333
Views: 24093

Re: Multiple Frame buffer beta testers wanted

Tried this twice now and both times after 5) copy files from here https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=216399&start=200#p1381436 (latest at the time of writing the post) to uSD 6) reboot My mouse, bluetooth and wifi stop working Im using RetroPie and using the new Pimiero HyperPi...
by jamesh
Mon Jan 14, 2019 5:05 pm
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 2145

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

OTOH preserving RAM contents across reboots is very helpful when debugging things (eg using ramoops) as is JTAG because it means you can do post-mortem analysis when a system crashed. Yes, I certainly think ramoops is useful and should be enabled by default too. But that could work together fine wi...
by jamesh
Mon Jan 14, 2019 3:45 pm
Forum: General discussion
Topic: Help with first RPi purchase
Replies: 9
Views: 534

Re: Help with first RPi purchase

Although the Pi0W would work, I'd be inclined to go with the Pi3B+. It has the hub built in, plus ethernet, has more memory and is faster with its quad cores and higher clock frequency. And still only $35. Once you take in to account the extras you need with the Pi0W the differnece in price is much ...
by jamesh
Mon Jan 14, 2019 3:34 pm
Forum: General discussion
Topic: Multiple Frame buffer beta testers wanted
Replies: 333
Views: 24093

Re: Multiple Frame buffer beta testers wanted

I'm not an expert on X and multidesktops, so anything you find out you can post here!
by jamesh
Mon Jan 14, 2019 3:31 pm
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 2145

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

The security implication is clear. If the Pi is turned on but on lock screen, and I have encrypted storage (which is standard in operating systems like Android, but also readily available on the Pi, e.g. when using Berryboot it is a matter of clicking the right checkbox during installation), I have...
by jamesh
Mon Jan 14, 2019 12:47 pm
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 2145

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

Can anyone actually explain why this is a valid security issue? In order to do any of the above, you need physical access to the device, in which case all bets are off anyway. Yeah, you need physical access and zeroing RAM at boottime would prevent this attack reading out the memory. I mean when we...
by jamesh
Mon Jan 14, 2019 10:06 am
Forum: General discussion
Topic: Multiple Frame buffer beta testers wanted
Replies: 333
Views: 24093

Re: Multiple Frame buffer beta testers wanted

Don't enable the KMS driver, that is not compatible.

Not sure what else it might be though.
by jamesh
Mon Jan 14, 2019 10:03 am
Forum: Beginners
Topic: NoIR v2 interfaced directly to 720P display
Replies: 3
Views: 90

Re: NoIR v2 interfaced directly to 720P display

That would be fine - plug in the camera, plug display into the HDMI port. Run `raspistill -t 0`, done.

For 2 displays, https://www.amazon.co.uk/Splitter-Xbox3 ... B00LM4IJ60
by jamesh
Mon Jan 14, 2019 9:50 am
Forum: Troubleshooting
Topic: [fixed ?]strange issue - libappindicator3 missing?
Replies: 7
Views: 234

Re: [fixed ?]strange issue - libappindicator3 missing?

Can you erxplain more fully how you got the error - steps to reproduce, and more detailed description of the error you are seeing.
by jamesh
Mon Jan 14, 2019 9:48 am
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 2145

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

Can anyone actually explain why this is a valid security issue? In order to do any of the above, you need physical access to the device, in which case all bets are off anyway.

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